Colorado GMU 128 Mule Deer Hunting
Huerfano, Las Animas, Otero and Pueblo counties, southeast Colorado · 1,210 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 128 is like
GMU 128 spans 1,210 square miles across Huerfano, Las Animas, Otero and Pueblo counties in the southeastern region of Colorado. The unit is characterized by gentle and rolling terrain, with elevations ranging from 4,300 feet to a high of 6,400 feet and a typical elevation around 5,100 feet. The terrain is predominantly gentle, with 96% of the unit falling in the gentle category, 3% moderate, and only 1% steep or rugged. This gentle topography means the walking is manageable on foot, though steep pitches are rare.
Legal access is the defining constraint here. Only about 3% of the unit, roughly 37 square miles, is generally open to public hunting on BLM land and Colorado State Wildlife Areas. An additional 12%, or about 141 square miles, is Colorado State Trust Land, but it is huntable only where CPW has enrolled parcels in the Public Access Program — access there cannot be assumed. The remaining 85% is private land. For a hunter planning to pursue mule deer here, the scarcity of dependably open ground means that public access, rather than terrain difficulty, is the primary limiting factor.
Mule deer occupy the unit across its full mapped range, with seasonal movements concentrated in winter. Winter Range covers 6% of the unit, and Winter Concentration—where mule deer cluster—accounts for 1%. Summer Range covers only 2%. CPW maps the entire unit within mule deer Overall Range, but that does not indicate uniform or year-round occupancy; the specifically mapped seasonal habitat is limited, at 2 percent Summer Range, 6 percent Winter Range and 1 percent Winter Concentration. Hunters should expect to find deer more concentrated during the late-fall and winter phenology periods and more dispersed during other times of year.
The unit offers three seasons for mule deer hunters. Archery runs September 2 to September 30 and is either-sex or doe only. Muzzleloader runs September 12 to September 20 and is either-sex, doe, or buck. Plains Early Rifle runs October 24 to November 3 and is either-sex, doe, or buck. The archery and muzzleloader seasons fall during the velvet shed and early fall transition phenology, when bucks are transitioning out of summer patterns. The rifle season spans the early fall migration and nocturnal buck phase into the early pre-rut staging period. The draw for this unit is easy—many hunters will draw with zero preference points—and overall hunter pressure is low.
Terrain & elevation
- Elevation
- 4,300–6,400 ft, typically around 5,100 ft
- Steepness
- Gentle — mean slope 2.6°
- Slope breakdown
- 96% gentle · 3% moderate · 1% steep · 0% rugged
- Ground you can count on
- ~37 sq mi, plus ~141 sq mi of State Trust Land where access depends on enrollment
Land & access
About 3% of GMU 128 is public land a hunter can count on — BLM and State Wildlife Areas. A further 12% is State Trust Land, which is huntable only where CPW has enrolled it.
- BLM2%
- State Wildlife Area<1%
- State Trust Land12%
- Private85%
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 128 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 Range6%used in winter
- Summer Range2%used in summer
- Winter Concentration1%where mule deer bunch up in winter
Mule Deer seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Archery | September 2 – September 30 | Either-sex, Doe |
| Muzzleloader | September 12 – September 20 | Either-sex, Doe, Buck |
| Plains Early Rifle | October 24 – November 3 | Either-sex, 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.
Fall weather
- September — highs around 82°F, lows around 50°F (mid-elevation normals)
- October — highs around 70°F, lows around 37°F, about 1.1 in of snow (mid-elevation normals)
- November — highs around 57°F, lows around 27°F, about 0.7 in of snow (mid-elevation normals)
GMU 128 mule deer hunting FAQ
How much public ground can a hunter actually hunt in this unit?
About 3% of the unit, roughly 37 square miles, is generally open to public hunting on BLM land and Colorado State Wildlife Areas. An additional 12% is Colorado State Trust Land, but it is huntable only where CPW has enrolled parcels in the Public Access Program, and enrollment varies; that acreage cannot be counted on. Private land makes up the remaining 85%.
Is this unit realistic for someone with no preference points?
Yes. The unit draws at an easy level for the entry-level mule deer hunt, meaning many applicants with zero preference points draw annually. This describes the easiest unit-wide either-sex or buck code available to adult Colorado residents in the primary draw; other weapons, seasons and nonresident applicants may require more points.
Does the rifle season here align with the rut?
The Plains Early Rifle season (October 24 – November 3) spans the early fall migration and nocturnal buck phase into the early pre-rut staging phenology. Hunting rut-related movement is possible late in this window, but the season begins before the primary rut, which CPW maps as November 11 to November 25.
What are the weather conditions like across the fall seasons?
September highs average 82°F and lows 50°F with no meaningful snowfall. October cools to highs around 69°F and lows 37°F, with about 1.1 inches of snowfall. November continues cooling to highs around 57°F and lows 27°F, with about 0.7 inches of snowfall. The season generally cools throughout the fall.
Where are mule deer concentrated in this unit?
Winter Concentration (where mule deer cluster) accounts for 1% of the unit; the mapping does not specify the location of that ground. Winter Range covers 6% of the unit overall. Mule deer use these areas more heavily as the season progresses into winter, while summer presence is limited to 2% of the unit.
Is the terrain here easy to walk?
Yes—96% of the unit is gentle terrain and only 1% is steep or rugged, so walking is manageable across most ground. However, legal access to public land is much more restrictive; only about 3% of the unit is generally open to public hunting, so terrain walkability does not translate into accessible hunting ground.
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.