2015 IndyCar season
Verizon IndyCar Series
Season
Races	16
Start date	March 29
End date	August 30
Awards
Drivers' champion	Scott Dixon
Manufacturers' Cup	Chevrolet
Rookie of the Year	Gabby Chaves
Indianapolis 500 winner	Juan Pablo Montoya
← 2014 2016 →

Scott Dixon (left) won his fourth Drivers' Championship whileJuan Pablo Montoya (right) finished second in the championship on tiebreaker asDixon had three race wins compared toMontoya who had only two race wins.In a remarkable end to the season, Scott Dixon had to win the pole, the race and lead the most laps to equalJuan Pablo Montoya points tally.

The2015 Verizon IndyCar Series was the 20th season of theIndyCar Series and the 104th season ofAmerican open wheel racing. Its premier event was the99th Indianapolis 500, which was held on May 24.Will Power returned as the reigning champion, whileRyan Hunter-Reay was the defending Indy 500 champion.Chevrolet entered the season as the reigning Manufacturers' champion. Indianapolis 500 and the season finale counted for double points.

The season was overshadowed by the death of driverJustin Wilson atPocono, after being struck on the head by debris fromSage Karam's car.

A week after Wilson's fatal accident, the finale was held atSonoma Raceway, whereScott Dixon secured his fourth career title after a low-key season that saw him win on a tiebreak againstJuan Pablo Montoya following his third win of the season after many consistent finishes leading up to the finale. Montoya won the Indianapolis 500 earlier in the season. It was a very competitive season with no standout performers and many different race winners and pacesetters. Except Dixon's three race wins, he finished on the podium only once, but due to their consistent finishing Dixon and Montoya had a significant margin to reigning champion Will Power in third.

• Aerokit modifications became specific to Honda and Chevy.
• Double points were awarded for the Indianapolis 500 race and for the season finale at Sonoma only. Previously double points were awarded at the three 500 mile oval events.
• Each team would continue to have two weeks of testing. Unlike past seasons, Promoter Days/Open Tests would count towards the testing allocation.
• The medical exemption was eliminated from pit selections. Pit selections are no longer based on drivers but teams' performance in the last race. This change eliminates a disadvantage by one IndyCar team that used a "two-platoon" system, with driver based on the circuit.
• Qualifying groups for qualifying at road/street course events was determined by the final practice session held before qualifying instead of by the first session of the weekend.
• Standing starts have been eliminated for 2015. The series says more development is needed before re-introducing them to the series, especially after numerous aborted standing starts and a crash at Houston during the 2013 season, and a start-line pile-up at the Indianapolis road course race in 2014.
• Each phase of the Indianapolis 500 Rookie Orientation Program saw see the speed requirements increased by 5 mph. Phase One consists of 10 laps at 205–210 mph, Phase Two of 15 laps at 210–215 mph and Phase Three of 15 laps at 215+ mph. The laps do not have to be consecutive. The phases and corresponding speeds may be adjusted based on track/weather conditions. The refresher program consisted of Phases Two and Three.^[1]

The following teams, entries, and drivers have been announced to compete in the 2015 Verizon IndyCar Series season. All teams will use aspecDallara DW12 chassis withmanufacturer aero kits andFirestone tires.

Team	Engine	No.	Driver(s)	Round(s)
A. J. Foyt Enterprises	Honda	14	Takuma Sato[2]	All
		41	Jack Hawksworth[2]	All
		48	Alex Tagliani[3]	6
Andretti Autosport	Honda	25	Simona de Silvestro[4]	1–2
			Justin Wilson[5]	5–6, 12–15
			Oriol Servià[6]	16
		26	Carlos Muñoz[7]	All
		27	Marco Andretti	All
		28	Ryan Hunter-Reay[8]	All
		29	Simona de Silvestro[9]	6
Bryan Herta Autosport	Honda	98	Gabby Chaves R [10]	All
CFH Racing	Chevrolet	6	J. R. Hildebrand[11]	5–6
		20	Luca Filippi[12]	1–5, 7–8, 10, 14, 16
			Ed Carpenter[13]	6, 9, 11–13, 15
		67	Josef Newgarden[14]	All
Chip Ganassi Racing	Chevrolet	8	Sage Karam R [15][16][N 1]	1–2, 4, 6–9, 11–15
			Sebastián Saavedra[16][N 2]	3, 5, 10, 16
		9	Scott Dixon[17][18]	All
		10	Tony Kanaan[18]	All
		17	Sebastián Saavedra[16][N 2]	6
		83	Charlie Kimball[19]	All
Dale Coyne Racing	Honda	18	Carlos Huertas[20][N 3]	1–2, 5–6
			Rocky Moran Jr. R [N 4]	3
			Conor Daly R [21]	3
			Rodolfo González R [22]	4, 7–8, 10, 14, 16
			Tristan Vautier[23]	6
			Pippa Mann[24]	9, 11–13, 15
		19	Francesco Dracone R [25]	1–5
			James Davison[26] R [N 5]	6
			Tristan Vautier[27][N 6]	6–16
		63	Pippa Mann[28]	6
Dreyer & Reinbold - Kingdom Racing	Chevrolet	24	Townsend Bell[29]	6
KV Racing Technology	Chevrolet	4	Stefano Coletti R [30]	All
KVSH Racing		11	Sébastien Bourdais[31]	All
KVSH Racing /Jonathan Byrd's Racing		88	Bryan Clauson R [32][N 1]	6
Lazier Partners Racing	Chevrolet	91	Buddy Lazier[33]	6
Rahal Letterman Lanigan Racing	Honda	15	Graham Rahal	All
		32	Oriol Servià[34]	6
Schmidt Peterson Motorsports	Honda	5	James Hinchcliffe[35][36][N 7]	1–6
			Ryan Briscoe[37]	6, 9, 11–16
			Conor Daly R [38]	7–8, 10
		7	James Jakes[39]	All
		43	Conor Daly R [40][N 1]	6
		77	Mikhail Aleshin[41]	16
Team Penske	Chevrolet	1	Will Power	All
		2	Juan Pablo Montoya	All
		3	Hélio Castroneves	All
		22	Simon Pagenaud[42]	All

• Bryan Clauson drove an entry fielded by Jonathan Byrd's Racing at the Indy 500 in 2015 and 2016. KV Racing Technology was confirmed to support the entry.^[43]
• Ed Carpenter Racing andSarah Fisher Hartman Racing merged to formCFH Racing,^[44] and useChevrolet engines and aerokits in 2015.^[45]
• Andretti Autosport re-signedRyan Hunter-Reay and sponsor DHL to a multi-year contract.^[8]
• Josef Newgarden announced that he would drive the CFH Racing #67 entry full-time in 2015 with an option for an extension of the contract for a second year.^[46]
• Simon Pagenaud departedSchmidt Peterson Motorsports after three years and joinedTeam Penske in the No. 22 car.
• Team Penske president Tim Cindric confirmed on Twitter that defending series champion Will Power would be running the #1 car, as opposed to his usual #12.^[47]
• Ryan Briscoe did not return toChip Ganassi Racing in 2015, and actively pursued another ride.^[48]
• James Hinchcliffe announced that he left Andretti Autosport to replace Pagenaud in the #5 Schmidt Peterson Racing car.^[35][36] He was joined in the team byJames Jakes – replacingMikhail Aleshin – who returned to the series after missing the 2014 season.^[39]
• Jack Hawksworth was confirmed to drive the #41A. J. Foyt Enterprises car full-time in 2015.Takuma Sato returned to the team's #14 car.^[2]
• Mikhail Aleshin returned to Schmidt Peterson Motorsports in a 3rd entry at Sonoma.^[49]

• The Itaipava Brasília Indy 300 was scheduled to be held on March 8 at theAutódromo Internacional Nelson Piquet in Brasília, Brazil.^[50] On January 29, the race was cancelled by theFederal District officials newly elected in the 2014 national elections, where the incumbentGovernor from theWorkers' Party had been defeated, and replaced by the candidate from theBrazilian Socialist Party.^[51] As tires and fuel had already been shipped for the race, the series sent representatives to theAutódromo de Goiânia to check the viability of the venue to host the race.^[52]
• NOLA Motorsports Park was announced to have a race over the weekend of April 10–12, 2015.^[53]
• Texas Motor Speedway was confirmed to return to the June 4–6 weekend and that the race would be on NBCSN.^[54]
• Auto Club Speedway was confirmed to be scheduled for June 27, moved from their usual date at the end of the season.^[55]
• IndyCar & Mi-Jack Promotions announced on August 29, 2014, that the Houston doubleheader atNRG Park has been canceled for 2015 due to scheduling issues.
• The races atBarber Motorsports Park (April 26),Mid-Ohio Sports Car Course (August 2) andSonoma Raceway (August 30) were confirmed by the release of thePirelli World Challenge schedule; PWC supports those events on the IndyCar calendar as well as St. Petersburg, Long Beach & Detroit.^[56]
• TheToronto Sun reported that theHonda Indy Toronto would stay atExhibition Place and would be run on the weekend of June 12–14, 2015, to avoid a clash with the2015 Pan American Games, due to be held the following month in the city. Unlike the last two seasons, the race weekend only featured one race instead of two, making Detroit the only double-header weekend of the season.^[57]
• TheABC Supply Wisconsin 250 at theMilwaukee Mile was confirmed to be held on July 12, 2015, by theMilwaukee Journal Sentinel.^[58]
• TheABC Supply 500 atPocono Raceway was moved from the July 4 weekend date the track had in 2013 and 2014 to the weekend of August 23 for the 2015 season.

Rd.	Race	Pole position	Fastest lap	Most laps led	Race Winner			Report
					Driver	Team	Manufacturer
1	St. Petersburg	Will Power	Hélio Castroneves	Will Power	Juan Pablo Montoya	Team Penske	Chevrolet	Report
2	New Orleans	Juan Pablo Montoya	Scott Dixon	Juan Pablo Montoya	James Hinchcliffe	Schmidt Peterson Motorsports	Honda	Report
3	Long Beach	Hélio Castroneves	Stefano Coletti	Scott Dixon	Scott Dixon	Chip Ganassi Racing	Chevrolet	Report
4	Birmingham	Hélio Castroneves	Ryan Hunter-Reay	Josef Newgarden	Josef Newgarden	CFH Racing	Chevrolet	Report
5	Indianapolis GP	Will Power	James Hinchcliffe	Will Power	Will Power	Team Penske	Chevrolet	Report
6	Indianapolis 500	Scott Dixon	Charlie Kimball	Scott Dixon	Juan Pablo Montoya	Team Penske	Chevrolet	Report
7	Detroit 1	Will Power	Jack Hawksworth	Marco Andretti	Carlos Muñoz	Andretti Autosport	Honda	Report
8	Detroit 2	Juan Pablo Montoya	Sébastien Bourdais	Juan Pablo Montoya	Sébastien Bourdais	KV Racing Technology	Chevrolet
9	Texas	Will Power	Will Power	Scott Dixon	Scott Dixon	Chip Ganassi Racing	Chevrolet	Report
10	Toronto	Will Power	Hélio Castroneves	Will Power Josef Newgarden	Josef Newgarden	CFH Racing	Chevrolet	Report
11	Fontana	Simon Pagenaud	Takuma Sato	Will Power	Graham Rahal	Rahal Letterman Lanigan Racing	Honda	Report
12	Milwaukee	Josef Newgarden	Hélio Castroneves	Sébastien Bourdais	Sébastien Bourdais	KV Racing Technology	Chevrolet	Report
13	Iowa	Hélio Castroneves	Scott Dixon	Josef Newgarden	Ryan Hunter-Reay	Andretti Autosport	Honda	Report
14	Mid-Ohio	Scott Dixon	Will Power	Graham Rahal	Graham Rahal	Rahal Letterman Lanigan Racing	Honda	Report
15	Pocono	Hélio Castroneves	Juan Pablo Montoya	Josef Newgarden	Ryan Hunter-Reay	Andretti Autosport	Honda	Report
16	Sonoma	Will Power	Hélio Castroneves	Scott Dixon	Scott Dixon	Chip Ganassi Racing	Chevrolet	Report

The season opener atSt. Petersburg was also the debut of unique aero kits for Honda and Chevrolet. Apprehension amongst the teams going into the race revolved around the complex, elaborate, and seemingly fragile front wings, and the lack of adequate replacement parts. The concerns were not unfounded, as dozens of on-track contacts throughout the field damaged countless wing components.

Will Power won the pole position, leading aTeam Penske sweep of the first four positions on the grid. Power took the lead at the start, and led 75 laps. During the final round of pit stops,Juan Pablo Montoya grabbed the lead after he managed a quicker pit stop than Power. In the closing laps, Power chased down Montoya, and narrowed the gap to less than a second with 11 laps to go. Power tried to pass Montoya for the lead in turn 10, but the two cars touched, damaging Power's front wing. Montoya held the lead, and went on to win, his first road course victory in IndyCar racing since 1999.

IndyCar made its first visit toNOLA Motorsports Park for the second round of the series. Lightning during qualifying in the middle of Round 1B cancelled the entire session, with the grid determined by entrant points, placingJuan Pablo Montoya on pole courtesy of having won the opening race in St. Petersburg. He was joined on the front row byPenske teammateWill Power.^[59]

The weather had eased on race day though not completely cleared, seeing the race begin in wet conditions. Montoya led the race early as conditions improved prompting a number of drivers to gamble on a switch to dry tires.Tony Kanaan andRyan Hunter-Reay both stopped after 11 laps,^[60] a decision which proved too early as Kanaan spun off soon after. Conditions rapidly improved though and two laps later the leaders pitted for dry tires which promotedJames Hinchcliffe into the lead, courtesy of an earlier stop. From there on the race was dictated by a series of caution periods as the drivers continued to struggle in the mixed conditions, the final caution period coming as Hunter-Reay,Sébastien Bourdais andSimon Pagenaud crashed together.

The series had announced a 1-hour and 45 minute time limit in the event of a wet race. Due to this time limit being reached in addition to the cautions, the race ended under yellow following the 3-car crash involving Hunter-Reay, Bourdais, and Pagenaud. Hinchcliffe won the race.

Hélio Castroneves won the pole position with a track record of 1:06.7442, beatingSébastien Bourdais's mark set inChamp Car in 2006. Castroneves'sPenske teammateJuan Pablo Montoya started alongside on the front row. At the start, Castroneves got the jump, and led into turn one.

During the first sequence of green flag pit stops on lap 29, Castoneves was briefly held in his pit box to avoid collision withTony Kanaan, who was entering the stall just ahead. The delay cost Castroneves valuable track position, and allowedScott Dixon to take over the lead. During the second round of pit stops on lap 55, Dixon was narrowly able to hold the lead, and cruised to victory, his first career win at Long Beach. With Dixon comfortably out in front, and Castroneves in second, the closing laps focused on a furious four-car battle for third place, led byJuan Pablo Montoya andSimon Pagenaud. Fifth place went toTony Kanaan.

With a second consecutive pole position,Hélio Castroneves took the front row with a time of 1:07.1925 alongside teammateWill Power, while a third-place effort bySimon Pagenaud made it another Penske 1-2-3 qualifying lock-out.Josef Newgarden took his first career victory, the fourth different winner in the four races thus far in the season.

Castroneves led early in the race, but lost the lead on lap 19 after another pit stop problem. The right-front tire changer lost a wheel nut, and that allowedJosef Newgarden to come to the lead. In the second half, Newgarden led,Scott Dixon was second, and Castroneves was third, butGraham Rahal was on a different pit strategy. As the leaders were attempting to save fuel and make it to the finish, Rahal pit on lap 70. With a full load of fuel, and new red option tires, Rahal went on a spirited charge to catch the leaders. He shaved 18 seconds off of Newgarden's lead, and passedScott Dixon for second on the final lap. Newgarden held off the charge and won his first ever IndyCar race by just 2.2 seconds.

Castroneves ran out of fuel on the final lap, forcing him to pit, and he dropped to 15th.Will Power recovered from a collision exiting the pits (and subsequent drive-through penalty) on lap 24 to come home fourth. With Castroneves dropping to 15th at the finish, teammateJuan Pablo Montoya maintained the championship lead.

Will Power won the pole position for the second annualGrand Prix of Indianapolis, continuing a dominating trend in 2015 forPenske Racing during qualifying. Penske cars qualified 1st, 3rd, 4th, and 5th, withGanassi'sScott Dixon (2nd) situated on the outside of the front row.

At the start, a multi-car tangle in turn one sawScott Dixon spin out in front of the entire field.Hélio Castroneves (in his milestone 300th Indy car start) was involved in contact, as wasJosef Newgarden, and others.Will Power took the lead and dominated the race, leading 65 of 82 laps. Power became the fifth different winner in as many races for 2015.

2008 winnerScott Dixon started from pole position for the 99th running of theIndianapolis 500. In a Three way shootout over the 14 remaining laps withWill Power andScott Dixon,Juan Pablo Montoya was crowned with his second Indianapolis 500 title. During post qualifying practice on May 18, James Hinchcliffe had a life-threatening crash sidelining him from the remainder of the season. He would recover to return in 2016.

A southwesterly cold front drenching the circuit for Saturday's race 1 of theBelle Isle Detroit Grand Prix, it wasWill Power on pole position. In a wet race on the composite circuit,Carlos Munoz took his first IndyCar win, lapping through 9th place in the process. Runner-up wasMarco Andretti;Simon Pagenaud finished 3rd.

The remnant of yesterday's cold front lingered in a fog over a soaking wetBelle Isle circuit for Sunday's race 2 of the Detroit Grand Prix. Qualification scrubbed, the grid formed up on the basis of driver points,Juan Pablo Montoya on pole position, withWill Power alongside, row 1. The first 37 laps were run caution free. Yet, 50% of the last 31 laps run under caution, seldom were there ever more than three consecutive green flag laps run, over the remaining portion of the race. The driver hasn't gotten his strategy correct,Sébastien Bourdais led to the stripe with 6 laps to go, gapped the field, and earned his first win of the 2015 season,Takuma Sato finished 2nd,Graham Rahal - 3rd.

Under a clear sky, high heat, and 63% humidity, 23 cars took to the D-shaped 1.5 mileTexas Motor Speedway circuit withWill Power on pole position. Ganassi driversScott Dixon andTony Kanaan finished first and second respectively, 7.8 seconds apart, with second-place Kanaan about 10 seconds ahead of third-placeHélio Castroneves.

With light rain as the field approached for the green flag, starter's orders called for a mandatory single-file rolling start.Will Power earned pole position;Josef Newgarden won the race, holding off hisCFH Racing teammateLuca Filippi by 1.4 seconds, ahead of third-place Castroneves, fourth-place Power andSébastien Bourdais in fifth.

Simon Pagenaud won pole position, followed byHélio Castroneves,Marco Andretti,Ed Carpenter,Juan Montoya andTony Kanaan. The lead would subsequently alternate 80 times throughout the 500-mile race, an IndyCar Series record.^[61] On lap 241, Sato collided intoWill Power, taking them both out of the race. This would set up a late sprint to the finish when the green flag waved on lap 247.^[62] On the penultimate lap of the race, the final incident of the day occurred whenSage Karam andJuan Pablo Montoya pinchedRyan Hunter-Reay intoRyan Briscoe, the latter of whom was sent airborne at a speed of 210 miles per hour (340 km/h).^[63] This allowed Rahal to complete the final two laps to the checkered flag under caution, for his first win of the year.^[62] This would be the final IndyCar race at this track as it was demolished in October 2023 for redevelopment.

Josef Newgarden picked up his first career pole in the VerizonIndycar Series. The first caution didn't came until 114 whenJames Jakes lost an engine in turn 1. The second caution didn't fly until 131 whenRyan Briscoe spun and hit his country mateWill Power in turn 4. The 3rd and final caution came in lap 222 whenJustin Wilson lost an engine in turn 1.Sébastien Bourdais eventually lapped the entire field. He managed to hold offHélio Castroneves andGraham Rahal to pick up his 2nd win of the year.Sébastien Bourdais got his first oval win since 2006 and the 34th of his career, tyingAl Unser Jr. IndyCar would then go on hiatus from this track until the2024 season.

Hélio Castroneves picked up his 3rd pole at Iowa. The start was waved off whenHélio Castroneves jumped his country mate and friendTony Kanaan. The first caution waved on lap 10 when Championship leaderJuan Pablo Montoya crashed in turn 2. The second caution came on lap 25 whenCharlie Kimball andStefano Coletti got together in turn 3. The third caution waved on lap 108 whenJustin Wilson got up high in turn 2, eventually cutting a tire down. The fourth caution came out on lap 172 whenCharlie Kimball crashed in turn 2. The fifth caution came on lap 195 whenStefano Coletti crashed in turn 2. The sixth and final caution waved on lap 262 whenTakuma Sato hit the wall in turn 2.Ryan Hunter Reay held offJosef Newgarden andSage Karam to pick up his first win of the season.Ed Carpenter got out of his car after the race and confronted the 20 year old rookie driver from Nazareth PennsylvaniaSage Karam.

Scott Dixon captured the pole at Mid Ohio, his 2nd pole of the season. he was followed byWill Power,Sébastien Bourdais,Hélio Castroneves,Josef Newgarden, andCharlie Kimball. Early onJosef Newgarden ranWill Power off track in turn 4, the first caution came out whenCharlie Kimball spun in turn 6, after getting his tire cut down fromWill Power. The first restart came on lap 7. The 2nd caution came out whenStefano Coletti spunTakuma Sato in turn 4, and there was debris in various locations around the track. The next restart came on lap 26. The 3rd caution came whenSage Karam spun between turns 4 & 5. The next restart came on lap 70. The final caution came whenRodolfo González spunCharlie Kimball in turn 4. The final restart came on lap 84 whenGraham Rahal held off a hard chargingJustin Wilson for the win.Graham Rahal picked up his 2nd win of the season and 3rd of his career tyingEd Carpenter for wins, he was followed byJustin Wilson andSimon Pagenaud.Graham Rahal gained 33 points on Championship LeaderJuan Pablo Montoya. The margin from 1st to 2nd in the championship was from 42 to 9.

Hélio Castroneves picked up his 4th pole of the season, and first at Pocono Raceway. The start was waved off twice whenHélio Castroneves jumped his teammateSimon Pagenaud. They finally waved the green flag on lap 2. The 2nd caution came whenJack Hawksworth lost a tire in turn 1, eventuallySage Karam andJuan Pablo Montoya dodged the lost tire fromJack Hawksworth. The restart came on lap 36. The 3rd caution came whenSébastien Bourdais wrecked in turn 2. The restart came on lap 42, the 4th caution came whenJack Hawksworth andCharlie Kimball getting together in turn 1. The next restart came on lap 92, the 5th caution came when Graham Rahal and Tristan Vautier crashed in turn 3. The next restart came on lap 103, the 6th caution came when debris fromEd Carpenter had contact fromJames Jakes, eventually the debris was on the frontstretch. The next restart came on lap 114, the 7th caution came whenTony Kanaan spun and hit the wall in turn 2. The next restart came on lap 138, the 8th caution came whenMarco Andretti spun and hit wall in turn 2. The next restart came on lap 148, the 9th caution (season's record) came when a fox ran from the infield and through the catchfence. The next restart came on lap 166. The 10th caution came whenHélio Castroneves crashed in turn 1. The next restart came on lap 172. The 11th caution came when rookieSage Karam spun and hit the wall in turn 1. As debris was strewn from the car, the nosecone section made contact withJustin Wilson's helmet inflicting severe brain damage. The unconscious Wilson then crashed into the infield at turn 1. The final restart came on lap 193, the 12th and final caution came on lap 197 when RookieGabby Chaves lost an engine.Ryan Hunter Reay picked up his 2nd win of the season, and 2nd out of the last 3 races, he held offJosef Newgarden andJuan Pablo Montoya for the win. The race set a new record of caution flags flew at an Indycar race, the record was previously held by the2007 Indianapolis 500. On August 24,Justin Wilson succumbed to his injuries 24 hours after the race. He had been in a coma following the injury he had received during the race. His death marked the first fatality for the Dallara DW12 and the first sinceDan Wheldon atLas Vegas Motor Speedway during theIZOD IndyCar World Championship.

Heading into the final race of the 2015 season, six drivers had a mathematical chance of winning the championship. Those drivers wereJuan Pablo Montoya,Graham Rahal,Scott Dixon,Will Power,Hélio Castroneves, andJosef Newgarden. Championship ContenderWill Power picks up his 6th pole of the season, 5th at Sonoma, and his 35th pole in his career. He was followed by the other 4 championship contenders Newgarden (2nd), Montoya (5th), and Rahal (6th). The drivers who are not in the championship started in the top 6: Ryan Hunter Reay (3rd) and Simon Pagenaud (4th). Other championship contenders Dixon started 9th and Castroneves started 15th. The race ran the first 32 laps without a caution untilLuca Filippi brought out the first caution when he slow on the track. The first restart came on lap 38, it didn't take long to get the 2nd caution came on lap 39 when Championship LeaderJuan Pablo Montoya took out his championship rival and teammateWill Power in turn 4. The next restart came on lap 42, the 3rd caution came on lap 65 whenJames Jakes crashed in turn 9. The next to last restart came on lap 69. The fourth and final caution came on lap 71 whenJack Hawksworth spunCarlos Muñoz in turn 7. The final restart came on lap 73, late in the raceSébastien Bourdais spun Championship ContenderGraham Rahal in turn 7 and there was no caution for that becauseGraham Rahal got the car going, Bourdais got a drive thru penalty for avoidable contact. After the race Rahal got out of his car and went to confront Bourdais. Dixon won his third win atSonoma Raceway, third of the year, and back to back wins atSonoma Raceway likeWill Power did in 2010 and 2011.Scott Dixon won his 4th championship tyingDario Franchitti,Sébastien Bourdais andMario Andretti for U.S. open wheel titles. Dixon was followed byRyan Hunter Reay andCharlie Kimball.Scott Dixon won the tiebreaker overJuan Pablo Montoya because Dixon had 3 wins to Montoya's 2. This race marked the final race ofsix time race winner Ryan Briscoe's career as he would not return toSchmidt Peterson Motorsports for2016, therefore bringing an end to his11-season career.

• Ties are broken by number of wins, followed by number of 2nds, 3rds, etc., then by number of pole positions, followed by number of times qualified 2nd, etc.

• One championship point is awarded to any driver for each lap they lead during a race. Two additional championship points are awarded to the driver who leads most laps during a race.
• At all races except the Indy 500, the number 1 qualifier earns one point.
• Entrant-initiated engine change-outs will result in the loss of ten points.
• Qualification points were not awarded for the Indy 500 due to last minute regulatory changes.^[64]

Pos Driver STP NOL LBH BAR IGP INDY BEL TMS TOR CAL MIL IOW MOH POC SON Pts 1 Scott Dixon 15 11 1* 3 10 4* 5 20 1* 8 6 7 18 4 9 1* 556 2 Juan Pablo Montoya 1 5*c 3 14 3 1 10 10*c 4 7 4 4 24 11 3 6 556 3 Will Power 2* 7 20 4 1* 2 4 18 13 4* 19* 22 10 14 4 7 493 4 Graham Rahal 11 8 11 2 2 5 23 3 15 9 1 3 4 1* 20 18 490 5 Hélio Castroneves 4 2 2 15 6 7 6 19 3 3 23 2 11 15 16 15 453 6 Ryan Hunter-Reay 7 19 13 5 11 15 13 8 18 19 16 13 1 7 1 2 436 7 Josef Newgarden 12 9 7 1* 20 9 8 21 21 1* 21 5 2* 13 2* 21 431 8 Tony Kanaan 3 6 5 13 7 26 20 13 2 6 2 6 21 5 19 4 431 9 Marco Andretti 10 13 8 10 16 6 2* 5 5 13 3 8 7 10 18 11 429 10 Sébastien Bourdais 6 21 6 8 4 11 14 1 14 5 14 1* 9 17 23 20 406 11 Simon Pagenaud 5 20 4 9 25 10 3 14 11 11 9 9 14 3 7 16 384 12 Charlie Kimball 21 14 15 12 5 3 22 11 7 20 8 12 22 23 12 3 372 13 Carlos Muñoz 14 12 9 6 13 20 1 23 6 22 11 15 5 9 5 22 349 14 Takuma Sato 13 22 18 17 9 13 11 2 16 10 18 14 19 24 6 8 323 15 Gabby Chaves RY  17 15 16 16 15 16 18 9 10 15 20 11 16 12 11 14 281 16 James Jakes 22 3 19 22 18 18 12 15 9 21 7 23 15 16 10 25 257 17 Jack Hawksworth 8 24 14 21 23 24 7 7 23 14 10 17 13 8 22 19 256 18 Ryan Briscoe 12 8 15 21 8 18 8 5 205 19 Stefano Coletti R  20 17 23 19 8 25 15 16 19 23 12 20 20 19 24 17 203 20 Sage Karam R  19 18 18 32 16 12 12 5 19 3 22 14 197 21 Luca Filippi 9 10 22 11 14 9 17 2 21 24 182 22 Tristan Vautier 28 17 4 20 17 17 16 12 6 21 23 172 23 James Hinchcliffe 16 1 12 7 12 Wth 129 24 Justin Wilson 24 21 18 17 2 15† 108 25 Sebastián Saavedra 10 17 23 16 13 96 26 Rodolfo González R  20 21 22 18 20 9 94 27 Ed Carpenter 30 22 22 10 6 17 88 28 Conor Daly R  17 33 19 6 12 81 29 Pippa Mann 22 17 13 24 23 13 76 30 Simona de Silvestro 18 4 19 66 31 J. R. Hildebrand 21 8 57 32 Oriol Servià 29 12 46 33 Mikhail Aleshin 10 40 34 Francesco Dracone R  23 23 21 23 22 38 35 Townsend Bell 14 32 36 Carlos Huertas 24 16 19 Wth 31 37 Alex Tagliani 17 27 38 James Davison R  27 10 39 Bryan Clauson R  31 10  — Buddy Lazier DNQ 0  — Rocky Moran Jr. R  Wth 0 Pos Driver STP NOL LBH BAR IGP INDY BEL TMS TOR CAL MIL IOW MOH POC SON Pts

Color Result Gold Winner Silver 2nd place Bronze 3rd place Green 4th & 5th place Light Blue 6th–10th place Dark Blue Finished (Outside Top 10) Purple Did not finish Red Did not qualify (DNQ) Brown Withdrawn (Wth) Black Disqualified (DSQ) White Did Not Start (DNS) Race abandoned (C) Blank Did not participate In-line notation Bold Pole position (1 point; except Indy) Italics Ran fastest race lap * Led most race laps (2 points) DNS Any driver who qualifies but does not start (DNS), earns half the points had they taken part. c Qualifying canceled no bonus point awarded † Fatal accident  RY  Rookie of the Year  R  Rookie

• Based on the entrant, used for oval qualifications order, and starting grids when qualifying is cancelled.
• Only full-time entrants, and at-large part-time entrants shown.

• The top three finishing drivers from each manufacturer in each race/qualifying score championship points for their respective manufacturer, provided they were using one of their four allotted engines.
• Two additional points are awarded to the manufacturer if one of their entrants leads most laps of a race.
• At all races except the Indy 500, the manufacturer who qualifies on pole earns one point.
• Manufacturers will earn ten points for each engine reaching the 2500-mile change-out threshold. Manufacturers will lose twenty points for each engine failing to reach the change-out threshold, or for a non-minor repair requiring a component change.
• A tie in points is broken, by number of wins, followed by number of 2nds, 3rds, etc., then by number of pole positions, followed by number of times qualified 2nd, etc.

• Official website

• IndyCar Series seasons
• 2015 in IndyCar
• 2015 in formula racing
• 2015 in motorsport

• CS1 Portuguese-language sources (pt)
• Articles with short description
• Short description matches Wikidata
• Use mdy dates from October 2020
• Pages using multiple image with auto scaled images
• Official website not in Wikidata