Twin Sisters East Peak
Twin Sisters Peaks viewed fromTrail Ridge Road
Highest point
Elevation	11,433 ft (3,485 m)[1][2]
Prominence	2,298 ft (700 m)[2]
Isolation	4.36 mi (7.02 km)[2]
Listing	Colorado prominent summits
Coordinates	40°17′20″N105°31′06″W / 40.2888732°N 105.5183324°W /40.2888732; -105.5183324[3]
Geography
Twin Sisters East Peak Colorado
Location	Rocky Mountain National Park,Larimer County,Colorado,U.S.[3]
Parent range	Front Range[2]
Topo map(s)	USGS 7.5' topographic map Longs Peak, Colorado[3]
Climbing
Easiest route	hike, scramble

Twin Sisters West Peak
Highest point
Elevation	11,418 ft (3,480 m)[4][5]
Coordinates	40°17′21″N105°31′10″W / 40.289087°N 105.519385°W /40.289087; -105.519385[5]

TheTwin Sisters Peaks are mountains inColorado, located in theFront Range inLarimer County, Colorado, straddlingRocky Mountain National Park andRoosevelt National Forest.

The mountain was originally known amongst Estes Park locals as Lily Mountain until the name Twin Sisters Peaks was submitted to the Washington Geographic Board on March 7, 1907 by Ellsworth Bethel. The first trail to the summit was constructed in 1914, at the same time the first fire lookout was established at the top by the Forest Service. In 1917, the mountain was officially made part of Rocky Mountain National Park's eastern boundary. Swiss mountaineer Walter Kiener was the first RMNP ranger to operate the fire lookout, serving in this position for five summers. Kiener's presence on the mountain increased visitor traffic and helped to popularize the hike with tourists. In 1936, the trail was reconstructed by theCivilian Conservation Corps. The ranger station was later razed in 1977, although its remains are still visible on the summit.^[6][7]

During the Colorado front range floods of 2013, the western side of the mountain experienced a large mudslide, which left a large muddy scar and wiped out several switchbacks of the trail. The trail was later re-defined within the scar to allow hiking to resume, but the damage is still visible from afar.

• Lillie Mountain
• Lillie Mountains
• Tahosa Mountain
• Twin Sisters Peaks – 1908^[3]

• List of Colorado mountain ranges
• List of Colorado mountain summits
  • List of Colorado fourteeners
  • List of Colorado 4000 meter prominent summits
  • List of the most prominent summits of Colorado
• List of Colorado county high points

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