Colorado Unit S01 Bighorn Sheep Hunting Guide

Colorado Unit S01 is one of the state's limited-quota bighorn sheep units, offering hunters a chance at high-country rams in a unit where every single tag is allocated through the draw. There is no general season here — S01 bighorn sheep hunting is 100% limited-entry, meaning hunters must draw a tag before ever setting foot in the field. With 111,411 total acres and 94% public land, the unit gives drawn hunters plenty of room to roam, but the tag itself is the hard part.

This is a unit built for the patient applicant. Bighorn sheep tags in Colorado are among the most difficult tags to draw in North America, and S01 is no exception. Hunters researching this unit are typically doing so because they've accumulated points for years and are now trying to decide whether S01 deserves a spot on their application. This article breaks down what the available harvest data, tag trends, and terrain profile actually say about the unit — no fluff, no invented numbers.

Unit Overview

S01 sits at elevations ranging from 6,482 to 10,995 feet, which puts hunters into a mix of lower-elevation approach terrain and true alpine sheep country at the top end. There is no wilderness acreage recorded for this unit, which is a meaningful data point for access planning — hunters won't be dealing with wilderness-area equipment restrictions or the motorized-access limitations that come with designated wilderness. Combined with the 94% public land figure, this is about as accessible as a bighorn unit gets in terms of raw land tenure — the vast majority of S01 is open to public hunting, a genuine advantage for DIY hunters who draw a tag here.

Harvest Success Rates

S01's recent harvest data shows a unit that produces results for the small number of hunters who draw tags, though the sample sizes are small enough that year-to-year swings should be read with some caution.

• 2025: 3 hunters, 2 harvested — 67% success
• 2024: 7 hunters, 6 harvested — 86% success
• 2023: 8 hunters, 5 harvested — 62% success
• 2022: 5 hunters, 1 harvested — 20% success
• 2021: 5 hunters, 4 harvested — 80% success
• 2019: 7 hunters, 7 harvested — 100% success

Across these six recorded years, hunter counts have never exceeded 8 in a single season, which is typical for a bighorn unit where tags are tightly rationed. Success rates have bounced significantly, from a low of 20% in 2022 to a perfect 100% in 2019, with most years landing in the 60–90% range. That volatility is the nature of small-sample sheep hunting data — a difference of one or two hunters filling or not filling a tag swings the percentage dramatically. The broader takeaway for hunters who do draw a tag here: historically, more hunters than not have been successful, and multiple recent seasons cleared 60% success or better.

Trophy Quality

Trophy records are tracked at the county level rather than by individual hunt unit, and the counties overlapping S01 carry a moderate history of trophy-class ram production. That means rams meeting record-book criteria have come from this general area, but it's not a unit with a deep or frequent pedigree of exceptional entries. Hunters drawing a tag here should treat trophy potential as a bonus rather than an expectation — a mature, legal ram is the realistic goal, and anything that reaches record-book territory should be considered an exceptional outcome rather than the norm. Given how few tags are issued and how few sheep are harvested here in any given year, there simply isn't a large enough sample to draw firm conclusions about trophy-class frequency, but the moderate trophy history in the surrounding counties suggests genuine quality rams are present in the herd.

Access & Terrain

S01's terrain spans nearly 4,500 vertical feet, from 6,482 feet at the low end up to 10,995 feet at the highest points. That range puts sheep country solidly in alpine and subalpine habitat — rocky, steep, and physically demanding, which is standard for bighorn hunting anywhere in Colorado's high country. Hunters should expect the classic challenges of sheep hunting: long approaches, glassing from a distance before committing to a stalk, and elevation gains that test conditioning even for experienced mountain hunters.

With 94% of the unit in public ownership, access is not the limiting factor here — the limiting factor is drawing the tag in the first place. The absence of any wilderness acreage in the unit's data means hunters aren't restricted by wilderness-specific rules on equipment or motorized access, which can simplify scouting and hunt logistics compared to units with heavy wilderness overlap. Hunters should use mapping tools — including HuntPilot's public land layers — to identify drainages, ridgelines, and glassing points before the season, since the terrain rewards hunters who have already narrowed down likely sheep habitat rather than searching blind once the tag is in hand.

Tag Quotas: A Shrinking Allocation

The tag quota data for S01 shows a unit trending toward fewer, not more, opportunities. Comparing 2024 to 2025:

• One hunt category held steady at a single tag in both years.
• Two other hunt categories were each cut in half, dropping from 2 tags to 1 tag apiece from 2024 to 2025.

This is a unit where the total number of tags available across all hunt types is extremely small — we're talking about a handful of tags total, split across resident and nonresident pools. The cuts from 2024 to 2025 reinforce just how tightly managed this herd is. Hunters should not expect quotas to expand in future cycles based on this trend; if anything, the direction has been toward tighter allocation. This makes S01 a unit where demand for the handful of available tags is intense, and where even well-positioned point holders should check current-year quotas carefully before finalizing an application strategy.

HuntPilot Analysis: Is S01 Worth Applying For?

S01 is a legitimate bighorn sheep unit, but it's not a unit to chase casually. The fundamentals worth weighing:

In favor of applying: The unit offers strong public access (94%), no wilderness-related restrictions on access, a genuine elevation gradient that supports classic alpine sheep habitat, and a harvest record showing that hunters who draw here have historically enjoyed solid success rates — several recent years cleared 60-80% or better. The moderate trophy history in the surrounding counties also suggests the herd has the genetic and habitat quality to produce mature, legal rams worth pursuing.

Working against it: Tag numbers are vanishingly small, and the trend from 2024 to 2025 was a cut in two of the three tracked hunt categories. This isn't a unit where a modest point balance is likely to result in a drawn tag anytime soon — it's a long-term investment play. Hunters also need to recognize that the harvest sample sizes are tiny (as few as 3 hunters in a season), so while success rates look encouraging, they're based on very few data points each year.

The honest verdict: S01 is worth having on an application list for hunters who are committed to the multi-year, sometimes multi-decade, process of drawing a Colorado bighorn tag. It is not a unit to expect quick results from, and the shrinking tag trend means hunters should stay current on quota changes each cycle rather than assuming stability. For hunters already deep into a points strategy for Colorado sheep, S01's public access and terrain profile make it a reasonable unit to include — but it should be one of several units in a broader strategy, not a singular target, given how few tags exist and how much variability exists year to year.

How to Apply

Colorado bighorn sheep tags are allocated entirely through the state's limited-quota draw system — there is no over-the-counter or general-season option for this species in S01. All hunters, resident and nonresident alike, must apply through Colorado Parks and Wildlife's annual big game draw to have a chance at a tag in this unit.

Colorado's system uses a true preference-point structure for sheep: the state's highest point holders draw first, which means a sufficiently high point level can put a hunter in a strong position for less-competitive units and hunt types. However, given how few tags S01 issues in any given hunt category, hunters should not assume any specific point total guarantees a tag here — the actual cutoff varies by year and hunt type. Residents and nonresidents apply through separate pools, and nonresidents should expect the competition for Colorado sheep tags to be intense regardless of point total.

Because application windows, fees, and current draw statistics change annually, hunters should not rely on static figures for planning. For up-to-date deadlines, current fee schedules, and the latest draw odds by point level, visit HuntPilot's Colorado state page at /states/co and the S01 unit page for the most current numbers before submitting an application.

Frequently Asked Questions

What is the terrain like in Colorado Unit S01? S01 spans a wide elevation range, from 6,482 feet up to 10,995 feet, putting hunters into classic alpine and subalpine bighorn habitat at the upper elevations. The unit carries no recorded wilderness acreage, meaning hunters won't encounter wilderness-specific access restrictions. With 94% of the unit in public ownership, there's ample room to scout and hunt without needing private land permission, though the terrain itself — steep, rocky, high-elevation country — demands strong physical conditioning regardless of land status.

What is harvest success like in Unit S01? Recorded harvest success in S01 has varied widely by year, ranging from a low of 20% in 2022 to a high of 100% in 2019. More recent seasons — 2024 at 86% and 2023 at 62% — suggest that hunters who draw tags here have generally found success more often than not, though hunter numbers each year are very small (as few as 3 to as many as 8), so these percentages should be read as trends rather than guarantees.

How big are the bighorn sheep in Unit S01? Trophy records for this general area indicate a moderate history of trophy-class rams coming from the surrounding counties. That points to a herd capable of producing mature, quality rams, though it isn't among the state's top-tier trophy units. Hunters should approach S01 expecting the chance at a solid, mature ram rather than banking on a record-book animal.

Is Colorado Unit S01 worth applying for? For hunters committed to a long-term points strategy, yes — S01 offers strong public access, no wilderness-access complications, and a harvest history showing reasonable success for those who do draw. But tag numbers are extremely limited and were cut in two of three tracked hunt categories between 2024 and 2025, so hunters should treat this as a long-horizon unit within a broader multi-unit application strategy rather than a single go-to pick.

How many bighorn sheep tags are issued in Unit S01 each year? The exact number of tags varies by hunt type and year, but the available data shows extremely limited allocations — as few as one or two tags per hunt category, with recent trends showing cuts rather than increases. Hunters should check HuntPilot's S01 unit page for the most current tag allocation figures before applying, since these numbers can shift from one draw cycle to the next.