Colorado GMU 51 Mule Deer Hunting
Douglas County, central Colorado · 503 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 51 is like
GMU 51 spans 503 square miles of Douglas County terrain in the central region, rising from 5,400 feet to 9,800 feet with a typical elevation around 6,900 feet. The country is rolling to moderately steep, with 49 percent gentle slopes, 39 percent moderate terrain, 12 percent steep slopes, and 1 percent rugged ground. Mule deer hunting here takes place across a mix of national forest and low-elevation foothill ground, with seasons running from early September through late November across multiple weapon types.
Roughly 44 percent of the unit—approximately 223 square miles—is generally open to public hunting, consisting of National Forest and State Wildlife Areas. An additional 11 percent is unclassified in ownership records; the remaining 45 percent is private. This means a hunter applying for this unit can reliably count on access to National Forest and State Wildlife Areas totaling around 223 square miles, with private ground making up a significant portion of the remaining landscape.
Summer Range covers 93 percent of the unit, while Winter Range blankets 64 percent, indicating mule deer presence across most of the unit through the fall. Winter Concentration covers 17 percent of the unit, marking areas where mule deer cluster during the colder months. No Migration Corridors are mapped here. The combination of broad seasonal-range coverage and substantial winter concentration suggests that as temperatures drop through November and into December, mule deer converge on concentrated wintering areas within the larger winter range.
The unit offers six seasons across all weapons in 2026: Archery from September 2–30 for either-sex mule deer; Muzzleloader September 12–20 for doe or buck; three rifle seasons—2nd Rifle October 24–November 1 for buck only, 3rd Rifle November 7–15 for buck only, and 4th Rifle November 18–22 for buck only—plus a private-land-only season running September 1–November 30 for either-sex animals. Archery and Muzzleloader seasons fall during the velvet-shed and early fall transition phases when bucks are actively moving. The 2nd Rifle season spans the early fall migration and nocturnal buck phase into the early pre-rut staging period. The 3rd Rifle season straddles the early pre-rut and primary rut phases, while 4th Rifle falls entirely within the primary rut. Hunter pressure on the unit is moderate overall, and draw difficulty for the easiest available buck or either-sex hunt code sits in the 1–2 preference-point range.
Terrain & elevation
- Elevation
- 5,400–9,800 ft, typically around 6,900 ft
- Steepness
- Moderate — mean slope 12.6°
- Slope breakdown
- 49% gentle · 39% moderate · 12% steep · 1% rugged
- Ground you can count on
- ~223 sq mi, plus ~1 sq mi of State Trust Land where access depends on enrollment
Habitat & cover
What actually grows here, by elevation. Each band adds to 100% on its own — these are shares of that band, not of GMU 51.
Lower elevations
- Grass and meadow39%
- Other cover31%
- Sagebrush21%
- Riparian4%
- Conifer3%
- Aspen1%
Mid elevations
- Conifer30%
- Sagebrush27%
- Grass and meadow22%
- Other cover12%
- Aspen7%
- Riparian2%
Higher elevations
- Conifer73%
- Sagebrush21%
- Other cover2%
- Aspen2%
- Grass and meadow2%
Cover classes from the USGS National Land Cover Database, split into elevation bands. “Other cover” is the remainder of the classification — bare ground, water, agriculture and developed land — and is left unnamed rather than guessed at.
Land & access
About 44% of GMU 51 is public land a hunter can count on — National Forest and State Wildlife Areas.
- National Forest44%
- State Wildlife Area<1%
- State Trust Land<1%
- Unclassified ownership11%
- Private45%
“Ownership unclassified” means the source dataset does not record an owner for that acreage. It is not known to be public or private.
Where mule deer live in the unit
Colorado Parks & Wildlife maps mule deer seasonal ranges statewide. This is how much of GMU 51 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
- Summer Range93%used in summer
- Winter Range64%used in winter
- Winter Concentration17%where mule deer bunch up in winter
- Migration Corridors<1%movement between ranges, not residence
Mule Deer seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Archery | September 2 – September 30 | Either-sex |
| Muzzleloader | September 12 – September 20 | Doe, Buck |
| 2nd Rifle | October 24 – November 1 | Buck |
| 3rd Rifle | November 7 – November 15 | Buck |
| 4th Rifle | November 18 – November 22 | Buck |
| Private-land only | September 1 – November 30 | 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 76°F, lows around 45°F (mid-elevation normals)
- October — highs around 63°F, lows around 33°F, about 1.7 in of snow (mid-elevation normals)
- November — highs around 52°F, lows around 23°F, about 2.3 in of snow (mid-elevation normals)
GMU 51 mule deer hunting FAQ
How much ground can a public-land hunter actually hunt in this unit?
Approximately 223 square miles of the unit's 503 total are generally open to public hunting through National Forest and State Wildlife Areas. The remaining 45 percent is private, and 11 percent is unclassified in ownership. A public-land hunter will need to research specific access points, trailheads, and seasonal restrictions within the open ground, as ownership alone does not guarantee unrestricted entry.
Is this unit realistic for a hunter with zero preference points?
The easiest unit-wide buck or either-sex hunt code reliably draws in the 1–2 preference-point band, meaning some zero-point applicants do draw the primary draw, but it is not dependable at zero points. Hunters with no points may also pursue tags through Colorado's secondary draw (a separate June draw with no preference points) or the leftover list after the primary draw closes.
Does the 4th Rifle season during the rut offer different hunting dynamics than earlier seasons?
The 4th Rifle season (November 18–22) falls entirely within the primary rut when bucks are most actively seeking does, often abandoning their typical movement patterns and becoming more vulnerable. The earlier rifle seasons occur before the peak rut, when bucks are still in their nocturnal phase or early pre-rut staging, making hunting strategy and timing quite different.
Where do mule deer concentrate as the season progresses into winter?
Winter Concentration covers 17 percent of the unit, marking areas where mule deer cluster during the colder months, though the mapping does not identify these locations by elevation, aspect, or drainage. As November advances and temperatures drop, hunters should expect mule deer to shift toward these concentrated wintering areas within the broader 64-percent winter range, though timing and extent vary with weather and snowfall.
How does temperature change through the hunting season here?
The unit cools substantially from September highs around 76°F to November highs around 52°F, with October sitting in between at around 63°F. October typically brings about 1.7 inches of snowfall, while November averages 2.3 inches, so hunters should prepare for cooling conditions and increasing precipitation as the season progresses.
What terrain should a foot hunter expect in the open-ground portions of this unit?
The unit is predominantly rolling to moderately steep, with 49 percent gentle slopes and 39 percent moderate slopes making up the bulk of the terrain. Only 13 percent of the unit is steep or rugged, so most of the National Forest and State Wildlife Areas should be manageable for hunters on foot, though elevation gains and exposure to mid-slope terrain will still be part of the hunt.
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
- USGS / MRLC — National Land Cover Database — habitat and cover classes by elevation band
- 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
- USGS PAD-US — Protected Areas Database of the United States — land ownership and access
- Daymet daily climate, 1991–2020 (Oak Ridge National Laboratory) — 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 September 24, 2026.