Colorado Unit 4 Pronghorn Antelope Hunting Guide

Colorado Unit 4 pronghorn hunting draws attention from hunters chasing a mix of solid public-land access and a legitimate shot at a quality buck in the northwestern part of the state. Spanning 299,151 acres with elevations ranging from 6,189 to 10,853 feet, this unit offers pronghorn habitat across a wide range of terrain, from lower sagebrush flats to higher benches near the unit's mountainous fringe. With 48% public land, hunters have a real foothold here, though private ground still controls a meaningful share of the unit — including, according to hunters who've drawn tags here, some of the best water sources.

Unit 4 has built a reputation among Colorado pronghorn hunters as a unit worth the point investment. Recent harvest data shows consistently strong success rates, and the counties overlapping this unit carry a strong history of trophy-class pronghorn production. For hunters weighing whether to spend points here or look elsewhere, the numbers and terrain profile give a clear picture of what to expect.

Herd Health & Population Trends

Wildlife survey data collected across six survey years from 2018 to 2024 shows an average buck-to-doe ratio of 40:100 in Unit 4. That's a healthy, sustainable ratio for pronghorn herds and indicates a buck segment with enough mature age classes to support quality hunting over time. A ratio in this range, tracked consistently across multiple survey years rather than a single anomalous count, is a good sign of herd stability — it suggests adequate buck survival from year to year rather than a herd that's been hammered down to mostly does and fawns.

For hunters evaluating whether Unit 4 can produce a mature buck, this ratio matters as much as harvest success. A unit can post strong harvest numbers while still being a herd of young, unimpressive bucks if the buck:doe ratio is skewed low. That's not the picture here — the multi-year average points to a herd with reasonable age structure supporting the unit's trophy reputation.

Harvest Success Rates

Unit 4's harvest numbers over the last five years show some of the more interesting swings a hunter will find in Colorado pronghorn units, largely tied to tag numbers rather than animal scarcity. In 2022, 696 hunters pursued pronghorn in the unit and 609 tagged out, for an 88% success rate — the high point of the recent stretch. The following year, 2021 data (listed with the same reporting period) showed 641 hunters and 495 harvests for 77% success.

Then tag numbers dropped sharply. In 2023, only 132 hunters hunted the unit, with 114 harvested for an 86% success rate. In 2024, that shrank further to 110 hunters and 94 harvested, an 85% success rate. Most recently, in 2025, just 64 hunters hunted Unit 4 with 49 harvested for a 77% success rate.

The takeaway: regardless of how many tags were issued in a given year, success rates have held in the high-70s to high-80s percent range across all five years. That's a remarkably consistent number for pronghorn hunting and suggests hunters who draw a tag here — even with reduced tag numbers in recent seasons — have a strong likelihood of connecting. The declining hunter numbers year-over-year likely reflect tighter tag quotas rather than declining opportunity, which is consistent with a unit management strategy aimed at protecting herd quality as tag numbers are dialed back.

Trophy Quality

The counties overlapping Unit 4 carry a strong history of trophy-record pronghorn production. This is a county-level designation — trophy records are logged by county, not by hunt unit boundary, so animals credited to these counties may have come from anywhere within them, including neighboring units that share the same county lines. That caveat aside, the pattern is a meaningful signal: this part of northwestern Colorado has consistently produced trophy-class bucks across multiple hunting seasons, and that trophy pedigree extends into Unit 4's boundaries.

Combined with the healthy 40:100 buck:doe ratio documented in recent survey years, Unit 4 stands out as a unit with strong trophy potential. Hunters willing to pass on the first legal buck and glass hard for mature animals have a realistic chance at connecting with a genuinely good pronghorn here — not just a management-class buck taken for the freezer.

Access & Terrain

At 48% public land, Unit 4 sits right at the threshold where DIY access is workable but not unlimited — hunters should expect a meaningful chunk of the unit's best habitat, including some water sources, to sit on private ground. Forum accounts from hunters who've drawn this tag consistently mention that private land controls access to some of the more reliable water in the unit, which pronghorn key on hard during the September rut period and the weeks around it. Hunters relying purely on public-land tactics should plan to scout early and identify which public parcels still have accessible water or travel corridors pronghorn use to reach it.

The elevation range — 6,189 to 10,853 feet — is unusually broad for a pronghorn unit and reflects Unit 4's mix of lower sagebrush basins and higher-elevation benches near the unit's mountainous terrain. This isn't the flat, wide-open pronghorn country found in eastern Colorado's plains units; hunters should expect more topographic relief, which can work in their favor for stalking and glassing but also means covering more vertical ground to pattern animals across the unit's habitat zones. There is no wilderness acreage in Unit 4, so access isn't restricted by wilderness designations — hunters can use motorized access on open roads throughout the public land base, which simplifies logistics compared to units with significant roadless terrain.

Hunters should use HuntPilot's mapping tools to identify the public-private checkerboard pattern in Unit 4 before the season, particularly around water sources, since on-the-ground forum reports confirm this is where access friction shows up most.

HuntPilot Analysis

Is Colorado Unit 4 worth applying for? Based on the data, yes — with realistic expectations about the draw. Harvest success has stayed strong across every year in the dataset, ranging from 77% to 88%, meaning hunters who draw a tag here are very likely to fill it. The buck:doe ratio of 40:100, tracked consistently across six survey years, points to a stable, well-managed herd rather than a boom-or-bust population. And the trophy history tied to the surrounding counties gives Unit 4 a real trophy ceiling that many pronghorn units simply don't have.

The trade-off is access. With just under half the unit in public ownership, hunters need to do their homework on where public land actually connects to huntable pronghorn habitat and water — this isn't a unit where hunters can show up and hunt anywhere they see antelope. Forum reports back this up, noting that private landowners control some of the best water in the unit.

For hunters building points and looking for a unit that rewards patience with both a high likelihood of success and a real shot at a mature buck, Unit 4 belongs on the short list. It's not a unit for hunters chasing a first-year, no-point tag — competitive Colorado pronghorn units like this typically require a multi-year point investment for nonresidents in particular, and residents should expect it to take some points as well given the trophy reputation and declining tag numbers in recent years.

How to Apply

Hunters should visit HuntPilot's Colorado state page at /states/co for the most current application windows and unit-specific data before submitting.

Application dates and fees change every draw cycle. For the current deadlines, fees, and draw odds, see HuntPilot's Colorado page at /states/co.

Frequently Asked Questions

What is the terrain like in Colorado Unit 4? Unit 4 spans a wide elevation range from 6,189 to 10,853 feet, combining lower sagebrush basins typical of pronghorn country with higher benches near the unit's mountainous edges. There's no wilderness acreage in the unit, so access is largely road-based rather than requiring backcountry travel. Hunters should expect more topographic relief than a flat, classic plains pronghorn unit.

What is harvest success like in Colorado Unit 4? Very strong. Over the last five reported years (2021-2025), success rates have ranged from 77% to 88%, with the most recent 2025 season posting 77% success on 64 hunters. Hunters who draw a tag in Unit 4 have consistently high odds of filling it once afield.

How big are the pronghorn in Colorado Unit 4? The counties overlapping Unit 4 have a strong history of trophy-record pronghorn production, and survey data shows a healthy 40:100 buck:doe ratio averaged across six recent survey years — a sign of a mature, well-structured buck population. While trophy-caliber animals are never guaranteed, the data supports strong trophy potential for hunters willing to be selective.

Is Colorado Unit 4 worth applying for? Based on available data, yes. Consistently high harvest success, a stable buck:doe ratio, and a strong regional trophy history make this a unit worth targeting for hunters willing to invest points and put in scouting time to navigate the public-private land mix.

How many points does it take to draw Colorado Unit 4 pronghorn? Current draw odds and point requirements aren't included in this data set. Hunters should check HuntPilot's Colorado unit page or the state's published draw statistics for up-to-date odds by point level and residency.