Colorado Elk Mule Deer Pronghorn

Unit 421 (Grand Mesa)

Colorado Hunting Guide — Elk, Mule Deer, Pronghorn

Unit 421 covers the Grand Mesa area in Mesa and Garfield Counties near Collbran, with 75% public land on the Grand Mesa NF. This massive flat-topped mountain rises to over 11,000 feet, featuring hundreds of alpine lakes, dense spruce-fir timber, and aspen groves. The Grand Mesa holds one of Colorado's strongest elk herds, and the mix of accessible and backcountry terrain accommodates all skill levels.

View Draw Odds Colorado Hunting Guide

Elk Hunting in Unit 421

Where to Find Elk in Unit 421

Elk on the Grand Mesa distribute across the vast flat-topped mountain, using the dense timber and alpine lake basins.

Archery Season (August-September)

During archery season, bulls hold in the spruce-fir timber above 9,500 feet near the alpine lakes and meadow systems. Focus on wallows and seeps in the dark timber between lakes. The hundreds of small lakes create endless water access.

Rifle Season (October-November)

Once rifle pressure and snow build, elk shift into the thick aspen and spruce-fir timber between 8,000-10,000 feet on the mesa slopes. The drainages flowing off the mesa toward Collbran and the Colorado River concentrate migrating elk.

Water and Feed

Water is abundant on Grand Mesa with hundreds of alpine lakes, creeks, and springs. Elk are never far from water, so focus on feed and cover rather than water sources.

How to Hunt Elk in Unit 421

Unit 421 rewards hunters who learn the Grand Mesa's vast timber and lake systems.

Glassing the Openings

The alpine meadows and lake clearings on the mesa top provide glassing opportunities in otherwise dense timber. Set up on elevated points overlooking meadow edges at dawn and dusk.

Calling and the Rut

September archery hunters should bugle the dark timber between alpine lakes above 9,500 feet. The dense elk population means calling is productive. Set up downwind of wallows between lake basins.

Still-Hunting Timber

During rifle season, slow-hunt the spruce-fir and aspen timber on the mesa. Snow improves tracking in the dense cover. Focus on the aspen-to-spruce transition zones and meadow edges.

Access Strategy

Access via CO 65 (Grand Mesa Scenic Byway) from Cedaredge or I-70, or forest roads from Collbran. The mesa has an extensive road system but the dense timber limits visibility. Deeper backcountry areas hold less-pressured elk.

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Elk Success Rates

Rifle19%

Unit 421 elk success rates have been steady over recent seasons. Rifle hunters average 18-22% success, with archery sitting around 9-11%. Muzzleloader falls between at 11-14%. Success tends to spike in years with early October snowfall that pushes elk into predictable travel corridors and feeding areas at lower elevations.

Elk Draw Odds

Season	Tags	Applicants	Draw %
Rifle— 5th Season	263	204	100.0%
Rifle— 2nd Season	165	98	100.0%
Rifle— 3rd Season	50	30	100.0%
Rifle— 4th Season	19	3	100.0%

Data from 2025 draw results. Resident odds shown.

Open in Draw Odds Engine

Unit 421 elk tags: Residents can expect first-choice rifle tags with 5-10 points, while non-residents typically need a few more. Second-choice options for archery and muzzleloader are accessible with 1-5 points. A practical unit for hunters building points.

Mule Deer Hunting in Unit 421

Unit 421 offers mule deer hunting on Grand Mesa in Mesa and Garfield Counties near Collbran, with 75% public land. The mesa's dense timber, alpine lakes, and aspen groves create productive buck habitat from 6,000 to 11,000 feet. Pressure is moderate but the vast timber provides escape cover for quality bucks.

Where to Find Mule Deer in Unit 421

Mule deer on the Grand Mesa use the full elevation range from the valley below at 6,000 feet to the mesa top above 10,000 feet.

Early Season (September-October)

Bucks hold in the spruce-fir timber and alpine lake edges on the mesa top, feeding in meadow openings and bedding in dark timber.

Rifle Season and the Rut (October-November)

As the rut approaches, bucks move to mid-elevation aspen and oakbrush zones on the mesa slopes near Collbran. Focus on doe groups near the aspen-to-timber transition.

Water and Terrain

Water is abundant on Grand Mesa. Focus on cover and feed rather than water when locating deer.

How to Hunt Mule Deer in Unit 421

Mule deer hunting on Grand Mesa centers on working the timber edges and alpine meadows.

Spot-and-Stalk Glassing

The alpine lake clearings and meadow edges on the mesa top offer glassing opportunities. Set up on elevated points at dawn.

Hunting the Rut

During the November rut, bucks cruise the aspen draws on the mesa slopes. Glass doe groups and watch for cruising bucks.

Ambush Points

Saddles between lake basins, trail crossings on the mesa, and creek drainages flowing off the mesa funnel deer.

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Mule Deer Success Rates

Mule deer success rates in Unit 421 run around 30-38% for rifle hunters, with archery at 12-18%. The rut-timed fourth rifle season typically produces the highest success as bucks drop their guard. Years with good summer moisture grow better browse and concentrate deer in predictable habitat.

Mule Deer Draw Odds

Draw odds data not available for this specific unit/species combination in our database.

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Unit 421 mule deer tags: Residents typically need 3-7 preference points for first-choice rifle, with archery accessible at 0-3 points. The unit offers reasonable draw odds for hunters building a medium-term point strategy.

Pronghorn Hunting in Unit 421

Unit 421 holds a small pronghorn population in the open grasslands and sage benches below Grand Mesa near Collbran in Mesa County. The agricultural lands and grassy flats between the Colorado River and the mesa base support scattered herds at 4,800-6,500 feet. Tags are limited and pressure is very low.

Where to Find Pronghorn in Unit 421

Pronghorn in Unit 421 inhabit the open grasslands and sage benches below the Grand Mesa between Collbran and the Colorado River valley.

Pre-Season Scouting

Scout the open flats and agricultural areas along the Colorado River valley below Grand Mesa. Herds pattern between morning feeding on sage benches and afternoon loafing near irrigated fields.

Water Holes

Stock ponds, irrigation ditches, and the Colorado River concentrate pronghorn in this semi-arid terrain.

How to Hunt Pronghorn in Unit 421

Pronghorn hunting in Unit 421 focuses on the limited open terrain below Grand Mesa.

Spot-and-Stalk

Use the rolling terrain and irrigation ditches near Collbran for cover during stalks. The open country rewards long-range marksmanship.

Water Hole Ambush

Ground blinds near stock ponds and irrigation features are productive. Pronghorn water predictably in the warm lower elevations.

Decoying

Buck decoys work on the open sage flats during early season.

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Pronghorn Success Rates

Pronghorn success rates in Unit 421 average 65-80% for rifle hunters, among the highest of any big game species in Colorado. The open terrain makes harvest rates consistently high. Archery pronghorn success runs 25-40% for hunters using blinds near water.

Pronghorn Draw Odds

Draw odds data not available for this specific unit/species combination in our database.

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Unit 421 pronghorn tags: Pronghorn tags typically require 1-5 preference points for residents, depending on the season. Non-resident pronghorn odds are generally reasonable across Colorado.

Unit Logistics & Expectations

Planning Notes

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RV Sites

Developed campgrounds on Grand Mesa with RV-suitable sites. Collbran and Cedaredge have services.

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Camp Sites

Multiple developed NF campgrounds on Grand Mesa. Dispersed camping widely available.

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Trailer Access

CO 65 paved across the mesa. Forest roads vary. Short trailers only on spur roads.

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Water

Abundant. Hundreds of lakes and streams on Grand Mesa. Always filter.

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Road Conditions

CO 65 paved and well-maintained. Forest roads maintained through October. Some close with early snow.

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Terrain Difficulty

Moderate. Elevation 6,000-11,000 feet. Dense timber, alpine lakes, aspen groves. Relatively flat on mesa top.

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Hunting Pressure

Moderate to high. The Grand Mesa draws significant pressure. Push into timber away from roads.

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Weather

Expect 15-45F during rifle season. Heavy snow common on the mesa. Prepare for winter conditions.

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Cell Service

Spotty on Grand Mesa. Limited in timber. Satellite communicator recommended.

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Nearest Town

Collbran

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Frequently Asked Questions

How many preference points do I need for Unit 421 elk?

Unit 421 elk draw odds vary by weapon type. Residents can expect first-choice rifle tags with 5-10 points, while non-residents typically need a few more. Check the CPW draw statistics for the most current point requirements.

What is the best season to hunt elk in Unit 421?

Archery season offers the best bugling action in September, while second and third rifle seasons in October provide the highest harvest rates. Late season can be productive if snow pushes elk to lower elevations in the Colorado River headwaters area.

Is Unit 421 good for a DIY elk hunt?

Yes. With 52% public land in the Arapaho National Forest/BLM, Unit 421 supports DIY hunts. Success requires physical fitness, pre-season scouting, and willingness to get away from roads into the sage-covered hills, river bottom willows, scattered aspen patches.

When is the best time to hunt mule deer in Unit 421?

The November rut during fourth rifle season typically produces the best buck movement. Early rifle seasons offer less competition. Archery hunters find good opportunity in September before pressure builds across the Colorado River headwaters area.

What kind of bucks can I expect in Unit 421?

Trophy quality is average for Colorado. Most harvested bucks are 3x3 to 4x4 class, with occasional larger bucks taken by hunters working the remote areas of the sage-covered hills, river bottom willows, scattered aspen patches.

How much public land is in Unit 421 for deer hunting?

Approximately 52% of Unit 421 is publicly accessible through Arapaho National Forest/BLM and BLM lands. Check the CPW atlas and a GPS mapping app for exact boundaries before hunting.

How do I access public land for pronghorn in Unit 421?

Public land in Unit 421 is primarily Arapaho National Forest/BLM land. Use BLM and CPW maps to identify accessible parcels near Kremmling. Some of the best pronghorn habitat crosses private land, so identify public access points before your hunt.

What is the best tactic for pronghorn in Unit 421?

Water hole ambushes are the most reliable method. Set up a blind near an active stock tank or spring on the sage-covered hills, river bottom willows, scattered aspen patches and wait for herds to come in. Spot-and-stalk works with patience and terrain features for cover.

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Sources & Verification

Every fact on this page is tied to a primary source below. Last fact-checked 2026-04-16.

Colorado Big Game Hunting Brochure (Current Cycle) — Colorado Parks and Wildlife · supports: Big game season dates (archery/muzzleloader/rifle), License type structure (limited vs OTC), GMU boundaries and special regulations, Tag quotas per hunt code · accessed 2026-04-16
CPW Elk Conservation and Management — Colorado Parks and Wildlife · supports: Elk herd management plans (DAU), Population objectives per DAU, Herd composition targets · accessed 2026-04-16
CPW Elk Hunt Statistics — Colorado Parks and Wildlife · supports: Per-GMU harvest totals (most recent season), Hunter success rates by season and hunt code, Population estimates per DAU · accessed 2026-04-16
CPW Hunting Atlas — GMU 421 — Colorado Parks and Wildlife / CSU NREL · supports: GMU boundary geometry, Public land (BLM/USFS/SLB) ownership layer, Migration corridors + severe winter range, Walk-in Access areas · accessed 2026-04-16
Colorado Elk Unit 421 Profile — GOHunt · supports: Hunter-community unit profile, Historical draw odds snapshot, Public-access overview · accessed 2026-04-16
CPW Mule Deer Conservation and Management — Colorado Parks and Wildlife · supports: Mule Deer herd management plans (DAU), Population objectives per DAU, Herd composition targets · accessed 2026-04-16
CPW Mule Deer Hunt Statistics — Colorado Parks and Wildlife · supports: Per-GMU harvest totals (most recent season), Hunter success rates by season and hunt code, Population estimates per DAU · accessed 2026-04-16
Colorado Mule Deer Unit 421 Profile — GOHunt · supports: Hunter-community unit profile, Historical draw odds snapshot, Public-access overview · accessed 2026-04-16
CPW Pronghorn Conservation and Management — Colorado Parks and Wildlife · supports: Pronghorn herd management plans (DAU), Population objectives per DAU, Herd composition targets · accessed 2026-04-16
CPW Pronghorn Hunt Statistics — Colorado Parks and Wildlife · supports: Per-GMU harvest totals (most recent season), Hunter success rates by season and hunt code, Population estimates per DAU · accessed 2026-04-16
Colorado Pronghorn Unit 421 Profile — GOHunt · supports: Hunter-community unit profile, Historical draw odds snapshot, Public-access overview · accessed 2026-04-16

Unit 421 (Grand Mesa)

Elk Hunting in Unit 421

Where to Find Elk in Unit 421

Archery Season (August-September)

Rifle Season (October-November)

Water and Feed

How to Hunt Elk in Unit 421

Elk Success Rates

Elk Draw Odds

Mule Deer Hunting in Unit 421

Where to Find Mule Deer in Unit 421

Early Season (September-October)

Rifle Season and the Rut (October-November)

Water and Terrain

How to Hunt Mule Deer in Unit 421

Mule Deer Success Rates

Mule Deer Draw Odds

Pronghorn Hunting in Unit 421

Where to Find Pronghorn in Unit 421

Pre-Season Scouting

Water Holes

How to Hunt Pronghorn in Unit 421

Pronghorn Success Rates

Pronghorn Draw Odds

Unit Logistics & Expectations

Explore Related Units

Unit 201 — Elk

Unit 54 — Elk

Unit 421 — Mule Deer

Unit 5 — Pronghorn

Unit 48 — Pronghorn

Frequently Asked Questions

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Sources & Verification