Colorado GMU 551 Mule Deer Hunting
Gunnison and Saguache counties, central Colorado · 546 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 551 is like
GMU 551 spans 546 square miles across Gunnison and Saguache counties in the central region, ranging from 7,800 feet to 13,400 feet with typical terrain at 9,500 feet. The landscape is rolling to moderately steep, with 35 percent gentle slopes, 52 percent moderate slopes, and 13 percent steep terrain. Elevations and slope mix support a range of seasonal mule deer patterns across the unit.
Public hunting ground comprises approximately 86 percent of the unit, or roughly 470 square miles, administered by the U.S. Forest Service and BLM. Private land makes up approximately 13 percent of the unit. Access to public ground depends on the location of roads, trailheads, and seasonal restrictions specific to each approach.
Mule deer occupy summer range across 96 percent of the unit and winter range on 40 percent. Twenty-one percent of the unit contains winter concentration areas where mule deer cluster during the post-rut and winter months. Migration corridors cover 4 percent of the unit. As the season advances from early fall through late fall, hunters should expect mule deer to shift from summer range toward winter range, though the timing and extent of this movement vary with weather and snow conditions.
The unit offers seven seasons total: Archery September 2–September 30 (doe and buck); Muzzleloader September 12–September 20 (doe and buck); four rifle seasons—1st Rifle October 14–October 18 (doe), 2nd Rifle October 24–November 1 (doe and buck), 3rd Rifle November 7–November 15 (doe and buck), and 4th Rifle November 18–November 22 (buck only)—plus a private-land-only season. The earliest archery and muzzleloader seasons occur during the velvet-shed and early fall transition phase when bucks are shedding antler velvet and beginning to shift to nocturnal behavior. The first and second rifle seasons fall during early fall migration, when bucks are becoming nocturnal and beginning to stage for the rut. The 3rd Rifle season spans the early pre-rut staging phase and the primary rut, while the 4th Rifle season runs during the primary rut. Temperatures cool from September highs around 66°F to November highs near 42°F, with October bringing an average of 1.7 inches of snow and November an average of 7.6 inches.
Terrain & elevation
- Elevation
- 7,800–13,400 ft, typically around 9,500 ft
- Steepness
- Steep — mean slope 14.6°
- Slope breakdown
- 35% gentle · 52% moderate · 13% steep · 0% rugged
- Ground you can count on
- ~470 sq mi, plus ~4 sq mi of State Trust Land where access depends on enrollment
Land & access
About 86% of GMU 551 is public land a hunter can count on — National Forest and BLM.
- National Forest67%
- BLM19%
- State Wildlife Area<1%
- State Trust Land<1%
- Private13%
Where mule deer live in the unit
Colorado Parks & Wildlife maps mule deer seasonal ranges statewide. This is how much of GMU 551 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 Range96%used in summer
- Winter Range40%used in winter
- Winter Concentration21%where mule deer bunch up in winter
- Migration Corridors4%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 66°F, lows around 36°F (mid-elevation normals)
- October — highs around 55°F, lows around 26°F, about 1.7 in of snow (mid-elevation normals)
- November — highs around 42°F, lows around 15°F, about 7.6 in of snow (mid-elevation normals)
GMU 551 mule deer hunting FAQ
How much public ground can a hunter actually use in this unit?
Approximately 86 percent of the unit, or roughly 470 square miles, is administered by the U.S. Forest Service and BLM and is generally open to public hunting. Private land comprises 13 percent. Actual access depends on road and trailhead availability and any seasonal closures that may apply to specific areas.
Is this unit realistic for a hunter with zero preference points?
The easiest unit-wide buck or either-sex hunts in the primary draw require 1–2 preference points and draw at moderate difficulty. A zero-point applicant would not draw these hunts reliably, though premium buck seasons in the unit require substantially more points. Applicants should check the current preference-point requirements and draw statistics for their specific hunt code of interest.
When are bucks most active and visible during the hunting season?
Archery and muzzleloader seasons occur during velvet shed and early fall transition, when bucks are shedding antlers and becoming more active. The first and second rifle seasons (mid-October through early November) coincide with early fall migration and nocturnal buck phase, when bucks are on the move. The 3rd and 4th Rifle seasons overlap the pre-rut and primary rut phases in mid-to-late November, when buck activity peaks but weather brings increased snowfall averaging 7.6 inches in November.
Where should a hunter expect to find mule deer as the fall season progresses?
Mule deer occupy 96 percent of the unit's summer range early in the fall. Winter range covers 40 percent of the unit, with 21 percent representing winter concentration areas where deer cluster. As the season advances and weather cools, hunters should expect mule deer to shift from summer ground toward winter range and the concentration areas, though timing and extent depend on snow and weather conditions.
What terrain should a hunter expect when hiking to public ground?
The unit is rolling to moderately steep, with 35 percent gentle slopes, 52 percent moderate slopes, and 13 percent steep terrain. Elevation varies from 7,800 to 13,400 feet. Hunters should be prepared for a mix of easier walking at lower elevations and steeper climbing at higher elevations.
How does hunter pressure compare to other units?
This unit experiences moderate overall hunter pressure. Draw difficulty is moderate at 1–2 preference points for the easiest unit-wide hunts, reflecting the relative competitiveness of the available tags. Moderate draw difficulty and moderate pressure are separate indicators—neither guarantees a particular field experience on the 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.