Are There Groundhogs in Colorado?
Groundhogs occur in Colorado but are restricted to the eastern plains and are rare or absent from the mountains. They inhabit grasslands and agricultural areas east of Denver and the front range. Colorado represents the western limit of the groundhog's natural range in North America. The state's high elevation and mountainous terrain limit groundhog distribution significantly.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
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- GBIF records
Groundhogs aren't established in Colorado, so you might be wondering:
Groundhogs occur in Colorado but are restricted to the eastern plains and are rare or absent from the mountains. They inhabit grasslands and agricultural areas east of Denver and the front range. Colorado represents the western limit of the groundhog's natural range in North America. The state's high elevation and mountainous terrain limit groundhog distribution significantly.
Groundhog Distribution Across Colorado
Groundhogs in Colorado are found primarily in the eastern plains and prairie regions, particularly in the area east of Denver and north and south along the front range foothills. The South Platte River valley, Republican River region, and areas near the Kansas and Nebraska borders support groundhog populations. Groundhogs occur in northeastern Colorado including Weld, Morgan, Logan, and surrounding counties where grasslands and agricultural lands provide suitable habitat. They are also found in southeastern Colorado near the Oklahoma panhandle and eastern plains of Las Animas and Huerfano counties. Groundhogs are rare to absent in central, western, and mountainous regions of Colorado where elevation exceeds 6,000 feet. The Rocky Mountain core, high plateaus, and most mountain valleys have no groundhog populations. The mismatch between mountain habitats and groundhog requirements restricts distribution to the state's eastern edge. Colorado represents the western limit of the groundhog's natural range. Groundhog occurrence in Colorado reflects the state's position at the range periphery. VisitColorado wildlife pagesfor detailed regional distribution information andgroundhog guides.
Colorado Season and Timing for Groundhogs
Colorado groundhogs emerge from hibernation in early spring, typically March or April, depending on weather conditions and elevation. The timing in eastern plains is earlier than in foothills. Groundhogs remain active through fall, typically retreating to winter dens in October or November. Spring and early summer are peak activity times when groundhogs feed on fresh vegetation and raise young. Young groundhogs are born in spring and remain in maternal burrows for about six weeks. Dispersal of juveniles occurs in mid to late summer. Late summer and early fall, groundhogs feed intensively to build fat reserves for hibernation. By late fall, most groundhogs are in burrows. Colorado's eastern plains have milder conditions than mountain areas, allowing longer active seasons. Groundhogs are primarily diurnal, most active in early morning and late afternoon. On warm spring days, groundhogs may be visible throughout daylight hours. ExploreColorado wildlifepages for seasonal information on other state species and regional ecology.
Groundhog Identification in Colorado
Colorado groundhogs are strong, chunky rodents weighing five to ten pounds, about the size of a large rabbit. They have compact bodies with short, powerful legs and a bushy tail. Their fur is reddish-brown to dark brown with a grizzled appearance from long guard hairs overlaying dense underfur. Groundhogs have distinctive small rounded ears, a blunt face, and large front teeth. Each foot has five toes with strong curved claws for digging. Their cheek pouches expand significantly to carry food. Groundhogs produce a distinctive high-pitched whistle when alarmed, earning them the name "whistle-pig." Males and females appear similar, though males are often slightly larger. Young groundhogs are smaller and finer-featured than adults. The stocky, strong build distinctly separates groundhogs from Colorado's prairie dogs, ground squirrels, and chipmunks. Prairie dogs are colonial and have dog-like barks. Ground squirrels are smaller and more slender. Learn more about identification onColorado wildlifepages and ourwildlifehub.
Colorado Habitat and Where to Find Groundhogs
Colorado groundhogs concentrate in grasslands and agricultural areas of the eastern plains where soil is accessible for burrow excavation. Look for groundhogs in pastures, hay fields, and prairie margins. Areas near the South Platte River and its tributaries support populations. Groundhogs in Colorado prefer rolling prairie and semi-arid grasslands rather than the harsh plains. They avoid compacted soils and seek areas with well-draining clay or loam. Fence lines and shelter-belt edges provide transitional habitat groundhogs use. Roadside ditches and embankments in agricultural areas create secondary habitat. Early morning offers best observation opportunities. Look for distinctive burrow mounds marking groundhog tunnels. Multiple entrances to burrow systems are common. Watching a site for an hour around dawn or dusk increases sighting chances. Groundhogs are less common and much harder to find in Colorado than in eastern and Midwestern states where they are abundant. The foothills and mountain regions have no groundhogs. OurColorado wildlife guidecontains specific location information and habitat descriptions.
Groundhog Behavior and Diet on Colorado Plains
Colorado groundhogs are herbivorous, feeding on grasses, clover, alfalfa, and wild plants available on the plains. They consume agricultural crops when fields are adjacent to burrows. Groundhogs occasionally eat bark and buds but primarily subsist on herbaceous vegetation. They do not store food, instead relying on fat reserves built during abundant feeding seasons. Groundhogs are solitary and highly territorial. Each individual maintains its own burrow system, often spanning a quarter-acre or more. They are intolerant of other groundhogs except during breeding season. Males establish territories through vocalizations and physical combat. Groundhogs breed in late winter and early spring. Females raise a single litter of three to six young annually. Young remain in maternal burrows for about six weeks before emerging to forage. By late summer, juveniles disperse to establish their own territories. Groundhogs spend significant time maintaining and enlarging burrow systems. They are primarily active during daylight hours, with peak activity in early morning and late afternoon.
Legal Status and Coexistence
In Colorado, groundhogs are classified as game animals and may be legally hunted during specific seasons. Check Colorado Parks and Wildlife regulations for current hunting season dates, bag limits, and legal methods. Groundhog hunting is permitted in appropriate seasons and areas. Most Colorado groundhogs cause minimal conflict with property owners. Groundhogs burrowing in gardens or yards can be managed humanely through live trapping and relocation to suitable grassland habitat. Exclusion fencing around gardens provides effective protection. Groundhogs are native Colorado residents and occupy ecological roles within plains ecosystems. Their burrows aerate soil and are sometimes used by other species. Agricultural damage from groundhogs is usually minor. Most farmers tolerate groundhog populations on their land. Groundhogs are not primary rabies vectors compared to raccoons and skunks. Learn more about Colorado wildlife management and coexistence strategies onColorado wildlife pages.
Similar Species and Prairie Rodent Identification
Several Colorado rodents might prompt groundhog questions. Prairie dogs are colonial burrowing rodents with dog-like barks and stand upright on hind legs. They are smaller than groundhogs and have different social behaviors. Ground squirrels are smaller and more slender than groundhogs with thinner tails. Chipmunks are much smaller with distinctly striped backs. Marmots in Colorado mountains are large rodents but adapted to alpine meadows. Muskrats are aquatic with flattened tails. Beavers are much larger and aquatic. Rock squirrels inhabit rocky terrain. Pocket gophers create mounded tunnels. Each species has distinctive features separating it from groundhogs. Understanding these differences improves wildlife identification and appreciation. Visit ourwildlifehub andColorado wildlife guidefor detailed species comparisons and identification information.
Frequently Asked Questions About Colorado Groundhogs
Q: Why are groundhogs rare in Colorado compared to eastern states? A: Colorado's elevation, mountains, and western location put it at the edge of groundhog range. Mountains and high plains lack the suitable habitat groundhogs need. Q: Do Colorado groundhogs hibernate? A: Yes, Colorado groundhogs enter hibernation for several months, retreating to underground burrows by fall. Q: Can groundhogs survive in Colorado mountains? A: No, Colorado's mountain regions are too high and cold. Groundhogs require lower-elevation grasslands with accessible soils. Q: What should I do if I see a groundhog in Colorado? A: Groundhogs are native and generally harmless. If a groundhog burrows in your yard, live trapping and relocation or exclusion fencing can manage conflicts humanely.
Plan your groundhog sighting in Colorado
There are no verified groundhog records for Colorado, which fits how uncommon they are here. See the GBIF records.
Where to look in Colorado
- Bent's Old Fort National Historic Site · Wildlife Watching, Birdwatching · Find hotels
- Black Canyon Of The Gunnison National Park · Wildlife Watching, Birdwatching · Find hotels
- Colorado National Monument · Wildlife Watching · Find hotels
- Curecanti National Recreation Area · Wildlife Watching, Birdwatching · Find hotels
- Dinosaur National Monument · Wildlife Watching, Birdwatching · Find hotels
- Great Sand Dunes National Park & Preserve · Wildlife Watching, Birdwatching · Find hotels
More places to see groundhog
More wildlife in Colorado