Colorado Unit S57 Bighorn Sheep Hunting Guide

Colorado Unit S57 is a limited-quota bighorn sheep unit covering 348,751 acres of high-elevation terrain in the state's rugged interior, with elevations ranging from 4,927 feet up to 11,227 feet. For hunters chasing one of the most coveted and difficult-to-draw tags in North American big game hunting, S57 represents a genuine opportunity — but one that demands a clear-eyed understanding of the unit's access, terrain, and historical harvest patterns before investing years of points into the pursuit.

This unit sits firmly in draw-only territory. There is no general season here — every bighorn sheep hunt in S57 is issued through Colorado's limited-quota draw system, meaning every tag holder, resident or nonresident, has gone through the same competitive application process to get boots on the ground. That exclusivity is part of what makes a bighorn tag in a unit like this one a career-defining hunt for many western big game hunters.

With 45% public land and just 2% wilderness designation, S57 offers a mixed ownership picture that hunters need to plan around carefully. The public land share means more than half the unit is privately held, so DIY hunters drawing this tag will need to do real homework on access points and boundaries before the season — this is not a unit where public ground blankets the landscape. The minimal wilderness footprint also means motorized and mechanized access options remain more available here than in some of Colorado's more heavily-restricted wilderness sheep units, which can be a meaningful advantage for scouting and packing out an animal from steep country.

HuntPilot Analysis: Is S57 Worth Applying For?

For bighorn sheep hunters, the honest answer is: it depends on what a hunter is optimizing for, but this unit deserves serious consideration for anyone building a long-term points strategy.

Recent harvest data pulled from HuntPilot shows a very small but telling pattern. In the 2025 season, only 2 hunters held tags in S57, and both harvested rams — a 100% success rate. That follows a 2021 season where 8 hunters also posted a 100% success rate. In between, success dipped to 50% in 2024, 40% in 2023, and 60% in 2022, with a 67% rate in 2019 on 6 hunters.

What these numbers tell us collectively is that S57 is an extremely low-volume, high-success unit. Tag numbers are small — never more than 10 hunters in any recent year — which is typical for bighorn sheep management, where populations and quotas are kept conservative to protect herd health. But the success rates, even in the "worst" recent years, never dropped below 40%, and multiple years hit 100%. That's a strong signal that hunters who draw this tag and put in the effort are converting at a high rate, which speaks well of both huntability and ram visibility in the unit.

The trophy picture adds another dimension. The counties overlapping Unit S57 carry a moderate history of trophy-class bighorn production. That's a meaningful data point — it tells hunters this isn't a unit known for producing an unusual concentration of record-book rams, but it also hasn't been a trophy desert. Moderate trophy history paired with consistently strong harvest success suggests a unit where a patient, well-scouted hunter has a realistic shot at a mature, respectable ram, even if it isn't among the handful of units in the state most famous for producing elite-class entries. It's worth remembering that trophy records are logged at the county level and shared across any unit overlapping those same counties — so this moderate trophy designation reflects the broader region, not S57 exclusively.

Given the elevation range topping out above 11,000 feet and bottoming around 4,900 feet, S57 also offers genuine terrain diversity — this isn't a one-dimensional alpine basin hunt. Rams could be found across a wide vertical gradient, which rewards hunters willing to glass broadly rather than assume sheep will be pinned to one elevation band.

Bottom line: S57 is worth applying for if a hunter is committed to the long game of Colorado's bighorn sheep draw and wants a unit with demonstrated high harvest success and at least moderate trophy potential. It is not a unit to chase for headline record-book scores, but the data shows hunters who draw here generally find and kill rams.

Harvest Success Rates

S57's harvest numbers over the past several recorded seasons paint a consistent picture of a productive, if low-quota, unit:

• 2025: 2 hunters, 2 harvested — 100% success
• 2024: 8 hunters, 4 harvested — 50% success
• 2023: 10 hunters, 4 harvested — 40% success
• 2022: 10 hunters, 6 harvested — 60% success
• 2021: 8 hunters, 8 harvested — 100% success
• 2019: 6 hunters, 4 harvested — 67% success

Across these six recorded seasons, success rates ranged from a low of 40% to a high of 100%, with most years landing in the 50-67% range. For context, bighorn sheep hunting across the West generally sees lower success rates than other big game pursuits due to the difficulty of the terrain and the selectivity hunters apply when targeting mature rams — so even the "low" years here represent solid performance. The fact that two separate seasons (2021 and 2025) produced 100% success among all tag holders suggests that when hunters commit to scouting this unit properly, rams are findable and killable. Hunter numbers are small enough each year (never exceeding 10) that individual outcomes can swing the percentage significantly, but the multi-year trend is favorable.

Trophy Quality

Trophy data for the counties overlapping Unit S57 indicates a moderate history of record-book production. This places S57 in a middle tier compared to Colorado's most storied bighorn units — it is not a unit defined by an outsized reputation for exceptional rams, but it has produced trophy-class animals historically and continues to be a legitimate option for hunters seeking a mature, representative bighorn.

Hunters should treat this as a realistic expectation-setter: a tag in S57 is far more likely to produce a solid, mature ram than a once-in-a-generation record-book entry, though the latter is always possible given enough rams on the landscape and enough scouting effort. Given that trophy records are attributed by county rather than by unit boundary, the moderate rating reflects production across a broader geographic area that includes S57 and its neighboring units — not a guarantee specific to this unit alone.

Access & Terrain

Unit S57 spans a dramatic elevation range — from 4,927 feet at its lowest points to 11,227 feet at its highest — meaning hunters could be working anywhere from lower foothill terrain to true alpine basins within the same unit boundary. This vertical diversity is one of the unit's defining characteristics and should shape scouting strategy heavily; rams may hold at different elevations depending on time of year, forage conditions, and pressure.

With 348,751 total acres and only 45% of that public, access planning is critical. Just under half the unit is open to public hunting, which means more than half of S57 is privately owned. Hunters drawing a tag here should not assume the kind of sprawling public access found in some of Colorado's larger wilderness-dominated sheep units. Securing permission or identifying legal public access corridors well before the season opens is essential, and HuntPilot's public land mapping tools can help hunters pinpoint exactly where that 45% public ground lies relative to likely sheep habitat.

The unit carries just 2% wilderness designation, which is notably low for a Colorado bighorn unit. Practically, this means hunters are not dealing with the stock-only, mechanized-access restrictions that come with heavily wildernessed terrain elsewhere in the state. That can be an advantage for scouting efficiency and gear staging, though it doesn't change the fundamental physical demands of hunting bighorn sheep in steep, broken country — hunters should still expect rugged conditions and come prepared for serious vertical effort regardless of wilderness status.

How to Apply

Colorado's bighorn sheep tags are issued exclusively through the state's limited-quota draw system — there is no general season or over-the-counter option for this species in S57 or anywhere else in Colorado. Every hunter, resident or nonresident, must apply through the annual draw and be selected before hunting this unit.

Colorado's draw operates on a true preference point system for sheep: the state's highest point holders are awarded tags first in a portion of the draw, meaning that at a sufficiently high point level, a tag becomes attainable. Colorado also runs resident and nonresident applicants through the process, with points accumulating for hunters who apply but are not selected. Because this is a genuine preference system — not a weighted lottery — point accumulation matters significantly over time for hunters serious about a unit like S57.

Hunters should also know that a successful draw consumes accumulated points for that species. A hunter who finally draws S57 after years of applying will begin rebuilding points from zero for future sheep applications.

Application structure, deadlines, and fees change every draw cycle, so rather than citing specific numbers here, hunters should check HuntPilot's Colorado state page for the current application windows, fee schedules, and point requirements at /states/CO, as well as the unit-specific page for S57 to review the latest draw data directly.

Frequently Asked Questions

What is the terrain like in Colorado Unit S57? S57 covers a wide elevation band from 4,927 feet to 11,227 feet across 348,751 acres, meaning the unit includes everything from lower foothill country to high alpine basins. This vertical diversity means hunters need to be prepared to scout and hunt across multiple terrain types and elevation bands rather than assuming rams will be concentrated in one zone. The unit carries minimal wilderness designation at just 2%, so access isn't restricted by the stock-only rules found in more heavily wildernessed sheep country.

What is harvest success like in Colorado Unit S57? Recent seasons show harvest success ranging from 40% to 100%, with most years falling between 50% and 67%. Tag numbers are small, typically under 10 hunters per season, but the consistency of success across multiple years — including two seasons at 100% — indicates this is a productive unit for hunters who draw a tag and put in solid scouting effort.

How big are the bighorn sheep in Unit S57? Trophy records from the counties overlapping S57 show a moderate history of record-book production. This suggests hunters can realistically expect to encounter mature, legitimate rams, though the unit isn't known as one of Colorado's standout producers of exceptional record-class animals. A tag here is best approached with realistic expectations for a solid mature ram rather than a guaranteed record-book trophy.

Is Colorado Unit S57 worth applying for? Based on available harvest data, yes — the unit has shown consistently strong success rates over recent seasons, including multiple years at 100%, combined with a moderate trophy history. For hunters building toward a bighorn sheep tag through Colorado's point system, S57 represents a unit where a drawn tag has a realistic chance of converting into a harvested ram, even though access requires careful planning given that only 45% of the unit is public land.

Is Unit S57 a good unit for DIY public land hunters? With 45% public land, just under half of S57 is open to public access, meaning the majority of the unit is privately held. DIY hunters can absolutely hunt here, but they need to invest real time into identifying exactly where public parcels lie in relation to sheep habitat before the season, rather than assuming broad open access. HuntPilot's mapping tools can help hunters identify public boundaries within the unit ahead of a scouting trip.