Colorado GMU 121 Mule Deer Hunting
Cheyenne, Lincoln and Kiowa counties, southeast Colorado · 1,049 sq mi
Based on the EASIEST unit-wide buck or either-sex hunt code available to adult Colorado residents in the 2026 primary draw — the lowest preference-point tier that drew reliably. Private-land-only and Ranching for Wildlife hunts are excluded because neither is a unit-wide public-land opportunity — NOT because the public cannot draw them. A private-land-only license requires the hunter's own permission to hunt private ground; a Ranching for Wildlife license is valid on the participating ranches enrolled in that program. They are separate systems. Other weapons, seasons and nonresident applicants can require substantially more points. The band is a floor, not a target: even the easiest qualifying hunt here sits in that range.
What hunting GMU 121 is like
Unit 121 spans 1,049 square miles across the plains of southeast Colorado in Cheyenne, Lincoln and Kiowa counties, with elevations ranging from 4,200 to 5,100 feet. The terrain is gentle and rolling throughout, averaging 1.1 degrees of slope. This is wide-open country with sparse vegetation and few natural barriers, relatively easy to walk but offering limited cover for stalking mule deer in the open landscape. The unit sits on the plains side of the state's deer distribution, where elevation and terrain favor a different character of hunt than the mountains.
Public hunting access is severely limited. Only about 0.1 percent of the unit—roughly 1 square mile—lies on Bureau of Land Management ground that is generally open to public hunting. An additional 4.2 percent is Colorado State Trust Land, but hunting it depends on CPW enrollment in the Public Access Program; access is not certain. The remaining 96 percent is private land. This distribution means that a successful hunt here depends almost entirely on obtaining private permission or drawing one of the special-access programs available through CPW.
Mule deer range across the full unit as mapped by CPW, but they concentrate on only about 1 percent of it during winter. Early in the fall archery and muzzleloader seasons—September into early October—deer are still on summer range and dispersed across the broader mapped area. As the plains early rifle season progresses from late October into early November, hunter should expect deer to begin moving toward winter concentration ground. The timing and extent of this shift vary with weather and snow.
The unit offers three seasons to public applicants. Archery runs September 2–30 for either-sex hunting during the velvet-shed phase when bucks are shedding antler covering. Muzzleloader runs September 12–20, also for either-sex hunting in the same velvet-shed phase. Plains Early Rifle runs October 24–November 3 for either-sex and doe-only, crossing into the early pre-rut period as the season progresses. Draw difficulty is easy, often requiring zero preference points for the most accessible either-sex tags, and moderate hunter pressure is typical. For applicants without preference points, the archery and muzzleloader seasons offer the most reliable draw odds among available hunts.
Terrain & elevation
- Elevation
- 4,200–5,100 ft, typically around 4,500 ft
- Steepness
- Gentle — mean slope 1.1°
- Slope breakdown
- 100% gentle · 0% moderate · 0% steep · 0% rugged
- Ground you can count on
- ~1 sq mi, plus ~44 sq mi of State Trust Land where access depends on enrollment
Land & access
About <1% of GMU 121 is public land a hunter can count on — BLM. A further 4% is State Trust Land, which is huntable only where CPW has enrolled it.
- BLM<1%
- State Trust Land4%
- Private96%
Colorado State Trust Land is open to public hunting only where it is enrolled in CPW's Public Access Program. Check current enrollment before planning around it.
Where mule deer live in the unit
Colorado Parks & Wildlife maps mule deer seasonal ranges statewide. This is how much of GMU 121 each range covers — the single best clue to whether mule deer are here in September, in November, or only passing through. The layers overlap, so they do not add to 100%.
- Overall Range100%the full extent of range CPW maps for mule deer — near 100% on most units, and not a statement about when mule deer are present
- Winter Range8%used in winter
- Winter Concentration<1%where mule deer bunch up in winter
Mule Deer seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Archery | September 2 – September 30 | Either-sex |
| Muzzleloader | September 12 – September 20 | Doe, Buck |
| Plains Early Rifle | October 24 – November 3 | Doe, Buck |
Dates span every hunt code of that type in this unit and can differ by code. Confirm the current brochure with Colorado Parks & Wildlife before applying.
GMU 121 mule deer hunting FAQ
Can a hunter with zero preference points draw a tag here?
Yes. The easiest qualifying either-sex code draws at zero preference points, making this unit realistic for applicants with no points banked. Archery and muzzleloader seasons in particular have shown reliable draw at the zero-point tier for adult Colorado residents.
Is there really only 1 square mile of huntable public land?
Yes, just 0.1 percent of the unit—about 1 square mile of BLM—is generally open to public hunting. An additional 4.2 percent is State Trust Land huntable only if CPW has enrolled the parcel in its Public Access Program. Access-dependent ground should not be counted as reliable hunting opportunity without direct confirmation of enrollment.
What kind of hunting is this—early season or late season?
The unit offers both. Archery and muzzleloader are early-season hunts in September when deer are on summer ground, suitable for velvet-phase hunting on dispersed deer. Plains Early Rifle spans late October into early November, bridging the early migration and early pre-rut phases, when deer begin shifting toward concentration areas.
How does terrain affect the hunt here compared to mountain units?
The gentle and rolling plains terrain is much easier to walk than steep mountain country, but the openness of the landscape makes concealment harder. Mule deer on these plains have broad sight lines and fewer escape corridors than in forested terrain, requiring different stalking and glassing strategies.
Where do deer concentrate on this unit?
About 1 percent of the unit holds winter concentration ground mapped by CPW, but the exact location is not specified in the public data. Hunters should expect deer to concentrate more tightly as winter approaches and move onto this ground depending on weather and snow conditions.
Is this unit better for private land or public land hunters?
This unit is primarily a private-land opportunity. With only about 1 square mile of generally open public ground and access-dependent State Trust Land whose enrollment status is uncertain, a public-land-only hunter will face severe constraints unless they can confirm specific parcels are open to public access.
Data sources & methodology
- Colorado Parks & Wildlife — Big Game hunting — seasons, weapons, hunt codes and license types
- CPW — Primary Draw rules — how preference points and the hybrid draw work
- CPW — Deer statistics, draw recap and Drawn Out At reports — the point levels behind the draw-difficulty bands
- CPW — Secondary Draw — licenses remaining after the primary draw
- CPW — Maps and GIS (Species Activity Mapping) — mule deer seasonal range
- CPW — State Trust Land Finder — which State Trust acreage is enrolled and open to public hunting
- Federal and state land-ownership datasets — land ownership and access
- NOAA climate normals — fall weather
Draw difficulty is a qualitative band, not published odds — the note under the summary above states exactly which hunt code it describes. Land shares are separate, non-overlapping categories: publicly owned is not the same as open to hunting, and State Trust Land is huntable only where CPW has enrolled it. Unit data last updated August 31, 2026.