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TheEastern Plains ofColorado refers to a region of theU.S. state of Colorado east of theRocky Mountains and east of the population centers of theFront Range.

The Eastern Plains are part of theHigh Plains, which are the westernmost portion of theGreat Plains. The region is characterized by mostly rolling plains, divided by theSouth Platte River andArkansas River valleys. There are also severaldeciduous forests, canyons, buttes, and a few large natural lakes and rivers throughout the region. The Eastern Plains rise from approximately 3,400 feet (1,000 m.) at the eastern border of Colorado withKansas, where the Arkansas River leaves the state, to 7,500 feet (2,300 m.)[citation needed] east of theDenver Basin.[1]
Most of the Eastern Plains region lies withinColorado's 4th congressional district.
The Eastern Plains have asemi-arid climate and receive little rainfall.[2] Much of the area relies onirrigation to survive. Summers are typically hot and dry, often bringingthunderstorms, which are often severe, to the area, with some occasionally forminglandspouts andtornadoes. Eastern Colorado winters are cold and dry, with significant snowfalls and icy conditions. Temperatures can sometimes fall to -40 to -30 degrees Fahrenheit in extreme cold waves, although this is rare.[3]

Eastern Colorado was once home to many Native American tribes. The Plains Indians that lived in the region included theArapahoe,Cheyenne,Kiowa,Pawnee, andSioux.[4] TheUte people formally ruled all over central and western Colorado, and onto the eastern plains as well. TheComanche once ruled all over southeastern Colorado, and theJicarilla Apache ruled in southeastern Colorado as well.[5]
In 1541, the Spanish came to the area now known as the south eastern portion of Colorado, in search of gold after hearing rumors in Mexico city. Not having found any gold, the Spanish largely left the area untouched. During the late 17th and 18th century Spain and France claimed southeastern Colorado. However, nobody settled the land. In 1803 the United States gained possession of much of the land east of Rocky Mountains with theLouisiana Purchase.
Zebulon M. Pike was sent by the federal government to lay out the boundary lines of territory in 1806. This expedition investigated the area now known as Colorado Springs. The prominent mountain in the area was named Pike's Peak after Pike, the leading commander of the exploration. There were multiple expeditions sent to lay out and explore the territory throughout the early 1800s. This created multiple trading posts with fur trades attracting many backcountry adventurers. There was still no permanent settlement created until after the conclusion of the Mexican War in 1848. San Luis was founded on the Culebra River in 1851. Spanish-speaking settlers who had moved north from New Mexico founded it. San Luis was shortly followed by settlements of San Pedro, San Acacio and Guadalupe.[6]
The Eastern Colorado plains are among the most sparsely populated areas in the continental United States. Some of the region, with the exception of comparatively urban areas likeSterling, is experiencing depopulation, which in some areas began with theinfluenza pandemic of 1918 and agricultural price collapses afterWorld War I.[7] TheDust Bowl devastated the region and further accelerated this outmigration, with people migrating toDenver.Baca County is emblematic of the population decline and its associated effects, as the county's population declined in every census from 1960 to 2020.


Both thePawnee National Grasslands andComanche National Grasslands are located in the Eastern Plains. They are composed of marginal farmlands that were withdrawn from agriculture and consolidated under federal control beginning in the Dust Bowl.[8]
TheAmache National Historic Site, located nearGranada inProwers County is administered by the National Park Service.[9]
Eastern Colorado is largelyfarmland, with many small farming communities. The major cash crops arecorn,wheat,hay,oats, andsoybeans.[10] There is also significantlivestock farming,dairy andpoultry farming, includingchicken for meat and eggs, andturkey farming. Most of the towns in the region havegrain elevators and prominentwater towers.[10] Also, over 90% of the farms in Eastern Colorado arefamily farms.
In Eastern Colorado most small towns have their own schools and sports teams, but in some parts where depopulation has been the worst, a single school is shared among surrounding towns. There are also a number of schools serving students in grades K–12 run by religious groups or public school districts. Eastern Colorado is one of the few remaining places in the United States that was still operatingone-room school houses in 2010.[citation needed]
Eastern Colorado is home to several institutions of higher education, primarily community colleges:
The most prominent religion in Eastern Colorado isChristianity, withRoman Catholicism the largest denomination.[citation needed]
Eastern Colorado roads span the gamut from paved roads to gravel roads to dirt roads. The unpaved roads are typically county or local roads that do not receive enough traffic to be paved. Some of the major paved roads include:
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