Colorado Unit 591 Elk Hunting Guide

Colorado Unit 591 is a limited-quota elk hunting unit covering 137,927 acres, with every hunt in the unit requiring a successful draw — there is no general season option here. Hunters researching Unit 591 are looking at a unit that sits entirely on public land, a rare and valuable trait that shapes how this unit should be approached, scouted, and applied for. With 100% public land and no wilderness acreage, Unit 591 offers straightforward access without the guide requirements or permit complications that come with wilderness-designated ground.

This is a unit built around managed, limited-quota hunting rather than high-volume opportunity. The absence of a general season means every hunter in the field — whether chasing an antlered bull or an antlerless tag — got there through the draw, which generally keeps hunter density more controlled than in over-the-counter units nearby. That said, hunters need to understand the tradeoffs in harvest success and herd composition before committing points or planning a trip into Unit 591.

HuntPilot Analysis: Is Unit 591 Worth Applying For?

The numbers here tell a mixed story, and hunters should go in with realistic expectations rather than hype. Harvest success in Unit 591 has trended downward over the past several seasons. In 2021, hunters posted a 19% success rate with 600 hunters afield and 114 elk harvested. That number held relatively steady into 2022 at 22% success (460 hunters, 100 harvested) — the best year in the recent data set. From there, though, the trend reversed: 2023 saw success drop to 18% (614 hunters, 112 harvested), 2024 fell further to 13% (728 hunters, 98 harvested), and 2025 dropped again to 10% success, despite a massive jump to 4,121 hunters afield and 414 total harvested.

That spike in hunter numbers in 2025 — nearly six times the hunter count of 2024 — while success rate fell to its lowest point in the five-year window, is a notable signal. More tags or more participation didn't translate to better opportunity; it diluted it. Hunters should view Unit 591 as a unit where the draw pressure (via tag numbers) does not guarantee more success per capita — quite the opposite in the most recent data.

On the herd health side, survey data from 2018 to 2024 shows an average bull-to-cow ratio of 26:100 across six survey years. That's a low ratio relative to what's typically considered a mature, bull-heavy herd, and it suggests either consistent bull harvest pressure, limited bull survival to maturity, or a cow-heavy management objective in this unit. Hunters chasing a mature bull need to factor this into their expectations — a lower bull:cow ratio generally means fewer mature bulls in the population relative to cows, which can make locating a shooter bull more time-intensive.

Trophy history for the counties overlapping Unit 591 is limited. There isn't a strong record of trophy-class bulls coming out of this area, and the qualitative data available points to limited trophy potential rather than a unit known for producing exceptional bulls. Hunters whose primary goal is a record-book caliber animal should treat Unit 591 as a long shot on that front — it's better suited to hunters prioritizing a quality public-land hunt and reasonable opportunity over trophy pursuit.

Put together: Unit 591 is worth considering for hunters who value 100% public land access and want a limited-quota hunt without dealing with wilderness-permit logistics, but it is not a unit to apply for with trophy expectations, and recent success-rate trends suggest increasing competition for tags is working against hunters' odds of filling a tag.

Harvest Success Rates

Success rates in Unit 591 over the last five recorded seasons:

• 2025: 10% success (4,121 hunters, 414 harvested)
• 2024: 13% success (728 hunters, 98 harvested)
• 2023: 18% success (614 hunters, 112 harvested)
• 2022: 22% success (460 hunters, 100 harvested)
• 2021: 19% success (600 hunters, 114 harvested)

The clear trend is declining success paired with rising hunter numbers, particularly the dramatic increase in 2025. Hunters should treat the 2022 season (22% success) as closer to a best-case scenario and the 2025 season (10% success) as a more conservative, and possibly more current, baseline for planning purposes. This kind of volatility in hunter numbers from year to year suggests tag allocations or hunt structures within Unit 591 have shifted — hunters should check HuntPilot's Unit 591 page for the most current tag and quota structure before applying.

Herd Health & Population Trends

The wildlife survey data for Unit 591 spans six survey years between 2018 and 2024, with an average bull:cow ratio of 26:100. This is a low ratio by elk herd standards and indicates a population skewed heavily toward cows relative to bulls. For hunters, this generally means:

• Bulls are harder to locate relative to overall elk sightings, since cows will vastly outnumber them in any given group.
• The unit may be managed with cow harvest in mind, which can help control herd size but also means fewer bulls are surviving multiple seasons to reach maturity.
• Hunters should not expect an abundance of mature bulls relative to the total elk population — persistence and thorough scouting matter more here than in units with higher bull:cow ratios.

Without more granular year-by-year ratio data to show a trend line, hunters should treat this 26:100 average as the most reliable indicator of general herd composition for planning purposes.

Trophy Quality

Trophy data for Unit 591 is limited. The counties overlapping this unit have a limited history of producing record-book entries, and the data available does not support an expectation of exceptional or elite trophy quality. This aligns with the broader herd composition data — a lower bull:cow ratio typically correlates with fewer bulls reaching the age and antler development needed for trophy-class scoring.

Hunters targeting Unit 591 should plan around a quality public-land hunt and a fair opportunity at a mature bull, rather than building trip expectations around a record-book animal. Hunters focused purely on trophy potential may want to compare Unit 591 against neighboring units with stronger documented trophy histories before committing points here.

Access & Terrain

Unit 591 sits at an elevation range of 5,174 to 6,965 feet, lower and less extreme than many high-alpine Colorado elk units. This moderate elevation band can mean more accessible terrain for hunters without extensive backcountry experience, and it often correlates with earlier green-up and different elk movement patterns compared to units pushing well above 9,000 or 10,000 feet.

The standout access feature of Unit 591 is its land status: 100% public land across all 137,927 acres, with 0% wilderness designation. This combination is valuable for DIY hunters for two reasons. First, there's no competition with private landowners for access — every acre in the unit is huntable public ground, assuming normal public land access rules apply. Second, the absence of wilderness acreage means no additional permit complexities or motorized-access restrictions that come with wilderness designation, and no guide requirements apply here regardless of residency (Colorado does not impose a wilderness guide mandate on nonresidents the way Wyoming does).

Hunters should use this 100% public land status to their advantage by covering ground broadly during scouting rather than assuming limited access will funnel elk into predictable pockets. Hunters planning their approach should use HuntPilot's mapping tools to identify public access points, elevation bands, and terrain features worth glassing, since specific terrain data beyond elevation and acreage was not available for this unit.

How to Apply

Every hunt in Unit 591 is limited-quota, meaning there is no general season fallback — hunters must draw a tag through Colorado's limited-draw system to hunt here, regardless of whether they're after an antlered bull or an antlerless elk. This applies equally to residents and nonresidents; neither can walk in on an over-the-counter tag in this unit.

Colorado's draw system is a true preference-point structure for elk, meaning the highest point holders draw first in a portion of the available tags, and a sufficient point level can functionally guarantee a tag on many hunts. Colorado does not operate elk draws as a weighted lottery alone — building preference points in Colorado has real, compounding value over time. Residents and nonresidents apply through the same draw structure but are generally evaluated within separate allocation pools, so nonresident odds and resident odds for the same hunt code will differ.

Because Unit 591 has no general season, hunters serious about hunting here should check their current point total against what's historically been competitive for this specific unit's hunt codes. Draw odds, tag quotas, and point requirements shift every year, so rather than citing specific numbers here, hunters should go to HuntPilot's Colorado state page for the current application windows, fees, and draw odds specific to Unit 591's hunt codes: /states/co.

Frequently Asked Questions

What is harvest success like in Colorado Unit 591? Harvest success has ranged from a high of 22% in 2022 down to 10% in 2025, with the five-year data showing a clear downward trend as hunter numbers increased substantially, especially in 2025 when hunter participation jumped to 4,121 from 728 the year before. Hunters should plan for success rates in the 10-20% range based on recent seasons rather than assuming historical averages from earlier years will hold.

Is Colorado Unit 591 worth applying for? It depends on priorities. For hunters who want 100% public land access, a limited-quota hunt with managed hunter density, and are comfortable with moderate success odds, Unit 591 is a reasonable option. For hunters chasing trophy-class bulls, the limited trophy history and low bull:cow ratio (26:100 average) suggest other units with stronger trophy records and herd composition data may be a better fit.

How big are the elk in Unit 591? Trophy data for the counties overlapping Unit 591 shows limited trophy history, and the available data does not support strong expectations of trophy-class bulls. Combined with a below-average bull:cow ratio, hunters should expect a fair chance at a mature bull but should not plan this hunt around producing a record-book animal.

What is the terrain like in Unit 591? Unit 591 ranges from 5,174 to 6,965 feet in elevation, a moderate band compared to many higher-elevation Colorado elk units. Specific terrain features like slope and vegetation type were not detailed in the available data, but the lower elevation profile suggests more accessible ground than high-alpine units. Hunters should use HuntPilot's public land and terrain mapping tools to identify specific glassing points and access routes within the unit's boundaries.

Does Unit 591 have a general season for elk? No. Every hunt in Unit 591 is limited-quota and requires a successful draw, including hunts for antlered and either-sex elk. There is no over-the-counter or general season fallback option in this unit for any residency type.