Colorado GMU 55 Mule Deer Hunting
Gunnison County, southwest Colorado · 886 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 55 is like
GMU 55 spans 886 square miles of rolling to moderately steep country in the Gunnison County area, with elevations ranging from 7,700 feet to 14,200 feet and a typical elevation near 10,400 feet. The terrain is dominated by gentle to moderate slopes—29 percent gentle and 50 percent moderate—with steeper terrain comprising 19 percent of the unit and rugged ground only 2 percent. The country supports a mix of National Forest, BLM, and State Wildlife Area holdings, making it a large landscape for mule deer hunting.
Public land open to hunting comprises approximately 89 percent of the unit, or roughly 791 square miles. The vast majority is National Forest land (82 percent of the total unit), with BLM and State Wildlife Area making up the remainder of the public holdings. Private ground accounts for about 11 percent of the unit. Access to public ground depends on roads, trailheads and seasonal conditions, which vary by location and should be confirmed before planning a hunt.
Mule deer occupy the unit across summer range that covers the entire unit and winter range covering 16 percent of the unit. Winter concentration areas—where mule deer cluster during cold months—make up 14 percent of the unit. Migration corridors cover 12 percent, indicating significant seasonal movement. Hunters should expect deer distribution to shift as temperatures cool and snow accumulates through the fall, with concentrated-use areas becoming more relevant as winter approaches, though the timing and extent of those shifts depend on weather.
The unit offers seven seasons total: Archery (September 2–September 30), Muzzleloader (September 12–September 20), four rifle seasons (1st Rifle October 14–October 18 for doe; 2nd Rifle October 24–November 1; 3rd Rifle November 7–November 15; 4th Rifle November 18–November 22 for buck), and one private-land-only season. Most seasons are either-sex for bucks and does, though 1st Rifle and 4th Rifle have restrictions. Archery and Muzzleloader seasons occur during the velvet shed and early fall transition, while rifle seasons span the early fall migration through the primary rut, with the 4th Rifle occurring during peak rut in mid-November. Draw difficulty is moderate, requiring 1–2 preference points for the easiest qualifying unit-wide either-sex or buck hunt available to adult Colorado residents. Moderate hunter pressure characterizes the unit overall.
Terrain & elevation
- Elevation
- 7,700–14,200 ft, typically around 10,400 ft
- Steepness
- Steep — mean slope 16.8°
- Slope breakdown
- 29% gentle · 50% moderate · 19% steep · 2% rugged
- Ground you can count on
- ~791 sq mi
Land & access
About 89% of GMU 55 is public land a hunter can count on — National Forest, BLM and State Wildlife Areas.
- National Forest82%
- BLM7%
- State Wildlife Area<1%
- State Trust Land<1%
- Unclassified ownership<1%
- Private11%
Where mule deer live in the unit
Colorado Parks & Wildlife maps mule deer seasonal ranges statewide. This is how much of GMU 55 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%.
- Summer Range100%used in summer
- 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 Range16%used in winter
- Winter Concentration14%where mule deer bunch up in winter
- Migration Corridors12%movement between ranges, not residence
Mule Deer seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Archery | September 2 – September 30 | Doe, Buck |
| Muzzleloader | September 12 – September 20 | Doe, Buck |
| 1st Rifle | October 14 – October 18 | Doe |
| 2nd Rifle | October 24 – November 1 | Doe, Buck |
| 3rd Rifle | November 7 – November 15 | Doe, Buck |
| 4th Rifle | November 18 – November 22 | Buck |
| Private-land only | August 31 – September 28 | Doe |
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 62°F, lows around 35°F, about 0.1 in of snow (mid-elevation normals)
- October — highs around 51°F, lows around 25°F, about 2.9 in of snow (mid-elevation normals)
- November — highs around 39°F, lows around 14°F, about 11.5 in of snow (mid-elevation normals)
GMU 55 mule deer hunting FAQ
How much ground can a public-land hunter actually access in GMU 55?
Approximately 791 square miles, or 89 percent of the unit, is open to public hunting through National Forest (82 percent of the unit), BLM, and State Wildlife Area lands. The remaining 11 percent is private. Actual access to any of that public ground depends on road availability, trailhead locations, and seasonal closures, which vary across the unit.
Is this unit realistic for a hunter with no preference points?
Not reliably. The easiest qualifying unit-wide buck or either-sex hunt draws at 1–2 preference points, placing the unit in the moderate draw-difficulty band. An applicant with zero points should not expect to draw that hunt reliably, but the unit does offer entry points for residents building preference. The unit also holds at least one premium buck season that requires substantially more points.
Which seasons offer the best chance of finding bucks still in velvet or early rut?
Archery (September 2–September 30) and Muzzleloader (September 12–September 20) occur during velvet shed and early fall transition, when bucks are still shedding antler velvet and have not yet entered rut. The 4th Rifle season (November 18–November 22) occurs during the primary rut, the latest and most predictable peak breeding window.
Does the terrain make this unit manageable for a hunter on foot?
The unit is predominantly gentle to moderate—79 percent falls in those two classes—making it walkable for most hunters without specialized climbing skills. Only 21 percent of the unit is steep or rugged, so a hunter willing to travel from roads and trailheads can find terrain suited to foot travel.
When should a hunter expect mule deer to be concentrating in specific areas?
Winter concentration areas cover 14 percent of the unit and become relevant as temperatures drop and snow accumulates. Early seasons (Archery and Muzzleloader in September) occur while deer are still distributed across summer range covering the entire unit. As the fall advances into October and November, expect increasing concentration as weather drives deer toward winter ground, though timing varies with snowfall and temperatures.
How does weather progress through the hunting seasons?
September highs average around 62°F with minimal snowfall (0.1 inches monthly), keeping conditions mild. October cools to highs near 51°F with moderate snowfall (2.9 inches), and November drops further to highs near 39°F with heavy snowfall averaging 11.5 inches. The trend is a steady cooling fall that can create transitional movement and concentrate deer as winter weather arrives.
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.