Unit 100, Colorado
Unit info
- Game species
- Mule Deer, Pronghorn
- Group
- Units 100s
- Area
- 1,059 mi²
- Public land
- 6%
Elk — season & harvest0% success
- Tag type
- OTC (plains rifle east of I-25, except select GMUs; resident and nonresident)
- Reported harvest
- 0
- Archery season
- Plains archery elk: September 2 – September 30, annually (OTC).
- General season
- Plains rifle OTC: September 1 – January 31, either-sex, all legal methods. GMU 100 is not among the select GMUs (104, 133, 134, 140, 141, 142) excluded from this OTC framework.
- Muzzleloader season
- No dedicated plains muzzleloader elk season for GMU 100; the plains ML elk season (2nd Saturday September, 9 days) applies only to GMUs 104, 133, 134, 141, and 142 per BGSS.
Elk numbers are low and opportunistic in this plains unit. Rut occurs early September, providing best calling/spotting window. Nearly all land private; landowner permission required.
Draw odds for Elkaren't on file for this unit yet. Check your state wildlife agency website for current draw statistics.
Mule Deer — season & harvest60% success
- Tag type
- Draw
- Reported harvest
- 101
- Archery season
- Plains archery: October 1 – October 24, November 5 – November 30, December 15 – December 31 (2025; splits around rifle seasons per BGSS). 2026: October 1–23, November 4–30, December 15–31.
- General season
- Plains rifle: October 25 – November 4 (2025); October 24 – November 3 (2026). All licenses limited, issued by GMU/DAU.
- Muzzleloader season
- Plains muzzleloader: October 11–19 (2025); October 10–18 (2026). All licenses limited, issued by GMU/DAU.
CRP edges and creek-bottom cottonwood strips concentrate deer; private-land permission hunting dominates; access through landowner relationships essential. Rut late October through December.
Draw odds for Mule Deeraren't on file for this unit yet. Check your state wildlife agency website for current draw statistics.
Pronghorn — season & harvest64% success
- Tag type
- Draw
- Tag quota
- 45
- Reported harvest
- 33
- Archery season
- August 15 – August 31 (bucks only), September 1 – September 20 (either-sex); annually 2025–2029 per BGSS.
- General season
- Rifle first season: October 4–12 (2025); October 3–11 (2026). Optional second rifle season: October 18–26 (2025); October 17–25 (2026). Limited buck and doe licenses issued by GMU/DAU.
- Muzzleloader season
- September 21–29, annually 2025–2029. Limited licenses issued by GMU/DAU.
Open prairie and cropland; rut is in September. Nearly all land private; landowner access essential. Relatively quick-to-draw plains pronghorn unit.
Draw odds for Pronghornaren't on file for this unit yet. Check your state wildlife agency website for current draw statistics.
Black Bear — season & harvest
- Tag type
- Draw
Rare; occasional movement along creek drainages from adjacent units. Not a primary bear hunting destination.
Draw odds for Black Beararen't on file for this unit yet. Check your state wildlife agency website for current draw statistics.
Mountain Lion — season & harvest
- Tag type
- Draw
Rare occurrence; documented in neighboring GMUs. Not a primary lion hunting destination.
Draw odds for Mountain Lionaren't on file for this unit yet. Check your state wildlife agency website for current draw statistics.
White-tailed Deer — season & harvest
- Tag type
- Draw
- Archery season
- Plains archery: October 1 – October 24, November 5 – November 30, December 15 – December 31 (2025; same structure as mule deer plains archery).
- General season
- Plains rifle: October 25 – November 4 (2025); October 24 – November 3 (2026). Limited licenses issued by GMU/DAU.
- Muzzleloader season
- Plains muzzleloader: October 11–19 (2025); October 10–18 (2026). Limited licenses.
Concentrations highest along intermittent creek drainages and riparian corridors; rut runs late October through December.
Draw odds for White-tailed Deeraren't on file for this unit yet. Check your state wildlife agency website for current draw statistics.
About this unit
AI-compiled · sourcedColorado GMU 100 is a northeast plains unit spanning roughly 1,060 square miles across Washington and Morgan Counties, centered between Akron and Brush on Colorado's eastern high plains; it contains no National Forest or BLM wilderness and is dominated by private agricultural land with only about 6% public access.
Flat to gently rolling shortgrass and mixed-grass prairie between approximately 4,350 and 4,980 feet elevation, dissected by dry gulches, draws, small canyons, and long intermittent creek drainages; sand hills occur along the northern border near the US-34 corridor. The low relief and modest elevation range are typical of Colorado's high plains bench east of the Front Range escarpment.
Public land is approximately 6% of the unit and consists primarily of small State Wildlife Areas and scattered state parcels; there is no National Forest, no BLM land of significance, and no wilderness. The unit is bounded on the west by Colorado Highway 71, on the south by US Highway 36, on the east by County Road 61, and on the north roughly along the US-34 corridor. County Road 63, running between Akron and Anton, is the primary interior artery. Wet weather renders many secondary dirt roads muddy and impassable. Hunting is almost entirely dependent on prior landowner permission. Nearest services: gas and food in Akron, Otis, Brush, and Anton; full services in Fort Morgan (~50 miles west). No designated trailheads, campgrounds, or wilderness within the unit.
Dominant cover is shortgrass and mixed-grass prairie with scattered mid-grass prairie; extensive dryland and irrigated cropland interspersed throughout. Conservation Reserve Program (CRP) fields provide key wildlife cover and are widely distributed. Sandsage and rabbitbrush occupy sandy soils. Russian thistle and yucca are common forbs and shrubs. Riparian corridors along intermittent creeks support narrow strips of cottonwood, willow, and Russian olive. No coniferous forest or aspen; no sagebrush steppe of the mountain type.
Mule deer are the primary big game species, found throughout all habitat types with highest densities in CRP fields, sandsage rangeland, and irrigated cropland margins. White-tailed deer concentrate along riparian drainages and creek bottoms. Pronghorn range widely across open prairie and cropland, particularly in flat terrain away from breaks. Elk are present as a minor, opportunistic population; the unit falls within the plains elk range east of I-25 under CPW's OTC framework, though density is expected to be low. Wild turkey are present in riparian zones. Mule deer rut occurs late October through December; pronghorn rut in September; elk rut in September.
- Colorado Unit 100 Unit Profile – GoHunt
- Deer Hunting in Colorado's GMU 100 – HuntScore
- Elk Hunting in Colorado's GMU 100 – HuntScore
- 2025-2029 Big Game Season Structure – Colorado Parks and Wildlife
- Hunting Deer – Colorado Parks and Wildlife
- Hunting Elk – Colorado Parks and Wildlife
- Colorado Hunting Season Dates (eRegulations)
- 2024 Colorado Deer Harvest Estimates (All Manners of Take per GMU) – CPW
- 2024 Colorado Elk Harvest Estimates (All Manners of Take per GMU) – CPW
- 2024 Colorado Pronghorn Harvest Estimates (All Manners of Take per GMU) – CPW
- 2024 CPW Primary Pronghorn Post-Draw Report (GMU 100 quota: 25 buck + 20 doe)
Questions, tips & discussion
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Boundaries: CPW official Game Management Units. Community info last updated 36d ago.