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 is a 503-square-mile unit in Douglas County, central Colorado, spanning elevations from 5,400 feet to 9,800 feet with terrain that rolls from gentle to moderately steep. Forty-nine percent of the unit is gentle terrain, 39% is moderate, 12% is steep, and 1% is rugged. The unit sits in foothill and lower-montane country typical of the Colorado Front Range.
Public hunting access covers roughly 44% of the unit—approximately 223 square miles of National Forest and State Wildlife Areas. An additional 11% of the unit has unclassified ownership; the remainder is private land. The public ground owned and managed by these agencies is the reliable hunting base available to applicants.
Mule deer occupy 93% of the unit in summer and 64% in winter. The Winter Concentration layer covers 17% of the unit, marking ground where mule deer cluster during the cold months. With summer range substantially broader than winter range, herds shift onto concentrated winter ground as the season advances into November and December, though timing and extent vary with weather and snow. Early seasons—archery in early September and muzzleloader through September—encounter mule deer in the Velvet Shed phase across much of their summer range. By the second rifle season in late October through early November, deer begin moving into and through early pre-rut staging areas. The third and fourth rifle seasons, running from November 7 through November 22, fall during the pre-rut and primary rut, when buck activity peaks.
The unit offers five public-land hunts to resident applicants: archery (September 2–30, either-sex), muzzleloader (September 12–20, doe/buck), and three rifle seasons in October and November (2nd Rifle October 24–November 1 and 3rd Rifle November 7–November 15 and 4th Rifle November 18–November 22, all buck-only). Fall weather transitions from September highs near 76°F to November highs near 52°F, with October bringing roughly 1.7 inches of average snowfall and November roughly 2.3 inches. Draw difficulty for the easiest unit-wide buck or either-sex hunt is Moderate, requiring 1–2 preference points for an adult Colorado resident, and overall hunter pressure on the unit is Moderate.
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
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
Can a hunter with zero preference points draw a public-land tag in this unit?
The easiest unit-wide hunt here—a buck tag in one of the rifle seasons—requires 1–2 preference points for an adult Colorado resident. Applicants with no points have not historically drawn reliably at that threshold, though draw outcomes vary year to year. Private-land-only hunts on enrolled properties may have different point requirements, but those require the hunter's own permission to hunt the private ground in question.
Is archery better suited to this unit than rifle seasons?
Archery (September 2–30) runs during the velvet-shed phase when bucks are still grouped with does and less reactive to pursuit. Rifle seasons, especially the 3rd and 4th seasons in November, coincide with the primary rut when buck behavior is most active. Rifle seasons offer either-sex options or buck-only hunting through late November, providing more flexibility; archery is either-sex only. The choice depends on preferred weapon and hunting style rather than one season being objectively better.
How much ground can a public-land hunter actually hunt here?
Public hunting access (National Forest and State Wildlife Areas) covers roughly 44% of the unit, or about 223 square miles. That figure does not account for private inholdings, seasonal road closures, or access restrictions on specific public parcels; hunters should verify current access conditions before the season. An additional 11% of the unit is unclassified ownership; the source data does not identify it as open or closed.
Does the terrain here require mountain fitness, or can a hunter cover ground on foot?
Forty-nine percent of the unit is gentle terrain and 39% is moderate, making most of the accessible ground manageable for a reasonably fit walker. Steep terrain comprises 12% of the unit. The rolling to moderately steep character overall does not demand extreme fitness, though elevation gain from 5,400 to 9,800 feet means some hunts will encounter thinner air at higher elevations.
When should a hunter expect mule deer to concentrate on winter range?
Winter range covers 64% of the unit, with 17% identified as winter concentration areas where mule deer cluster. The timing of movement depends on snowfall and weather patterns. Hunters pursuing the 3rd and 4th rifle seasons (November 7–22) should expect deer to be shifting toward or established on winter ground, though the pace and degree of that shift vary with conditions each year.
Is this a good unit for someone unfamiliar with the area?
The moderate terrain, abundant public land, and straightforward season structure make GMU 51 a reasonable choice for newer hunters. Moderate hunter pressure means crowding is not extreme. Draw difficulty of 1–2 points is accessible to applicants who have built a point or two, though zero-point applicants will face difficulty. The rolling terrain and mixed elevations offer diverse hunting approaches, though success still depends on learning deer movement patterns and accessing public ground effectively.
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.