Colorado GMU 78 Mule Deer Hunting
Archuleta, Conejos, Mineral and Rio Grande counties, southwest Colorado · 764 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 78 is like
GMU 78 spans 764 square miles across Archuleta, Conejos, Mineral and Rio Grande counties in the southwest region of Colorado. The unit's terrain is mixed, with substantial steep ground: 32% of the unit is gentle, 40% moderate, 24% steep and 4% rugged by area. Elevations range from 6,200 feet to 13,300 feet, with typical elevations around 8,600 feet. The hunting is characterized by a fall that cools from September highs near 68°F to November highs near 45°F, with snowfall increasing from essentially zero in September to 2.3 inches in October and 12.8 inches in November.
Approximately 62% of the unit—475 square miles—is open to public hunting on National Forest (61% of the total unit) and BLM land (1.1% of the total unit). The remaining 38% is private land. The mix of public and private ground, along with elevational variation and topography, shapes where and when hunters can access mule deer across the fall season.
Mule deer occupy summer range across the entire unit. As the season progresses into fall, hunters should expect mule deer distribution to shift as temperatures drop and snow accumulates. Winter range covers 21% of the unit and winter concentration ground 6%. The timing and extent of this seasonal shift vary with weather and snow. Migration corridors cover 68% of the unit, indicating that substantial movement occurs as mule deer transition between seasonal ranges across the fall.
The unit offers seven seasons: archery from September 2–30 for either-sex; muzzleloader from September 12–20 for doe or buck; four rifle seasons running from October 14–18, October 24–November 1, November 7–15, and November 18–22, with the first rifle season buck-only and the remaining three doe/buck; and a private-land-only season from October 24–January 15. The archery and muzzleloader seasons fall during velvet shed and early fall transition. The first rifle season occurs during early fall migration and nocturnal buck phase. The second rifle season spans early fall migration and early pre-rut staging. The third rifle season covers early pre-rut staging and primary rut. The fourth rifle season falls during the primary rut. Overall hunter pressure on the unit is high, and draw difficulty is easy—the easiest qualifying unit-wide either-sex or buck code for an adult Colorado resident often requires zero preference points.
Terrain & elevation
- Elevation
- 6,200–13,300 ft, typically around 8,600 ft
- Steepness
- Steep — mean slope 17.9°
- Slope breakdown
- 32% gentle · 40% moderate · 24% steep · 4% rugged
- Ground you can count on
- ~475 sq mi, plus ~1 sq mi of State Trust Land where access depends on enrollment
Land & access
About 62% of GMU 78 is public land a hunter can count on — National Forest and BLM.
- National Forest61%
- BLM1%
- State Wildlife Area<1%
- State Trust Land<1%
- Unclassified ownership<1%
- Private38%
Where mule deer live in the unit
Colorado Parks & Wildlife maps mule deer seasonal ranges statewide. This is how much of GMU 78 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
- Migration Corridors68%movement between ranges, not residence
- Winter Range21%used in winter
- Winter Concentration6%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 |
| 1st Rifle | October 14 – October 18 | Buck |
| 2nd Rifle | October 24 – November 1 | Doe, Buck |
| 3rd Rifle | November 7 – November 15 | Doe, Buck |
| 4th Rifle | November 18 – November 22 | Doe, Buck |
| Private-land only | October 24 – January 15 | 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 68°F, lows around 38°F (mid-elevation normals)
- October — highs around 57°F, lows around 29°F, about 2.3 in of snow (mid-elevation normals)
- November — highs around 45°F, lows around 18°F, about 12.8 in of snow (mid-elevation normals)
GMU 78 mule deer hunting FAQ
Can someone with no preference points draw a mule deer tag here?
Yes. The easiest qualifying unit-wide either-sex or buck hunt here draws at zero points for an adult Colorado resident in the primary draw. Other seasons, weapons, nonresident applicants and specific codes can require substantially more points, but at least one public-land opportunity is available with no preference-point history.
How much public land can a hunter actually hunt on?
Approximately 475 square miles (62% of the unit) is open to public hunting on National Forest and BLM land. The remaining 38% is private. Whether all of that public ground is accessible depends on road and trailhead availability, seasonal closures, and private inholdings—checking current access conditions before the hunt is essential.
Which seasons work best for early-fall versus late-fall hunting?
Archery and muzzleloader (September 2–20) fall during velvet shed and early fall transition, before the rut. The first rifle season (October 14–18) occurs during early fall migration as bucks become nocturnal. The second and third rifle seasons (October 24–November 15) span migration staging and the beginning of the primary rut, which runs from November 11–25. The fourth rifle season (November 18–22) falls during the primary rut itself.
How much of the unit has mule deer concentrated in winter?
Winter range covers 21% of the unit, and winter concentration ground—where mule deer cluster—accounts for 6%. Most of the unit supports summer-range use, so hunters in late fall should expect mule deer distribution to shift as snow accumulates, though the timing and extent vary with weather and snow.
What kind of terrain should a hunter expect?
The unit is mixed topography: 32% gentle, 40% moderate, 24% steep and 4% rugged by area. Elevations span 6,200 to 13,300 feet, creating varied country that can be steep and challenging in some areas but also includes more gradual terrain. A hunter on foot should be prepared for both gentle slopes and substantial climbs.
Does hunter pressure affect tag availability?
Hunter pressure on the unit is high overall, but high pressure and draw difficulty are separate things. The easiest qualifying hunt here is easy to draw—often at zero points. This means tags remain available to those entering, but hunters should still expect to see other people, particularly during the popular rifle seasons.
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.