Colorado Unit 23 Mule Deer Hunting Guide

Colorado Unit 23 sits in the White River drainage country of northwest Colorado, spanning 271,006 acres with elevations ranging from 6,093 to 10,096 feet. For mule deer hunters researching this unit, the most important structural fact is this: there is no general season here. Every mule deer hunt in Unit 23 is limited-quota, meaning hunters must draw a tag before they ever set foot in the field, including hunts for antlered bucks.

This unit falls within a broader region of northwest Colorado long known among deer hunters for producing quality bucks, and it draws attention from both in-state and nonresident applicants who cash in points hoping for a shot at a mature deer. With 50% public land, Unit 23 offers a genuine mix of accessible public ground and private land, which shapes both hunting strategy and the reality of what a tag holder can expect once they're on the ground.

This article breaks down what the data actually shows about Unit 23 — harvest trends, herd composition, trophy potential, and how the draw process works — so hunters can decide whether to spend points here.

HuntPilot Analysis: Is Unit 23 Worth Applying For?

The honest answer is nuanced. Unit 23's harvest numbers tell a story of a unit that has seen dramatic swings in hunting pressure and success. In the 2025 season, 7,274 hunters pursued deer in the unit and posted a 49% success rate with 3,587 animals harvested — a huge jump in both hunter numbers and success compared to prior years. By contrast, 2024 saw only 1,130 hunters with a 26% success rate (299 harvested), and 2023 logged 564 hunters at a 28% success rate (156 harvested).

That spike in 2025 hunter numbers and success rate is a significant departure from the two previous years and likely reflects either a change in tag allocation, a shift in hunt structure, or a different mix of hunt types being lumped into the unit total. Because this is unit-wide harvest data covering all limited-quota hunts combined, it's not possible to isolate which specific hunt types drove that success spike — but the trend is worth noting for any hunter evaluating their odds of connecting once they have a tag in hand.

On the trophy side, the counties overlapping Unit 23 carry a strong history of trophy-class mule deer production. This aligns with the unit's reputation in hunting circles — one forum post cited in research for this unit even referenced Unit 23 as having more deer than a neighboring unit, with slightly lower elevation country. That said, because trophy records are logged at the county level and shared across all units within those counties, this strong trophy history reflects the broader region rather than being unit-exclusive. Neighboring units draw from the same pool of record-book animals.

The buck:doe ratio data adds an important caveat. The available survey data shows a ratio of 29:100 from a single survey year (2024). This is a notably low ratio compared to a healthy mule deer herd benchmark, and with only one year of data available, it's difficult to determine whether this reflects a genuine herd health concern or a limited sample. Hunters should treat this figure cautiously — it's not enough data to draw firm conclusions, but it's also not a number to ignore. A 29:100 ratio, if representative of the broader herd, suggests fewer mature bucks per doe than hunters might expect from a unit with strong trophy history, which could mean more time spent finding a shooter buck versus filling a tag on the first legal animal seen.

Given the no-general-season structure, this is a unit where hunters commit points and time specifically for a controlled hunt experience, not a walk-up opportunity. For those who value quality over volume and who have the points to spend, the trophy history and public land access make Unit 23 worth serious consideration. For hunters chasing quick success without much scouting or effort, the mixed harvest data and low recent buck:doe ratio suggest tempering expectations.

Access & Terrain

Unit 23 covers a substantial elevation range, from 6,093 feet up to 10,096 feet, which gives hunters a variety of habitat types to work with — from lower-elevation sagebrush and desert-adjacent country up into higher timbered and alpine terrain. Forum commentary on the area (though describing an adjacent unit for comparison) notes that Unit 23 doesn't reach quite as much high country above 10,000 feet as some neighboring units, which may concentrate deer at somewhat lower elevations for more of the season.

With 50% public land across the unit's 271,006 acres, roughly half of Unit 23 is open to public access, while the other half is private. This is a meaningful split — hunters should not assume they can simply pick a spot on a map and hunt it; careful attention to land ownership boundaries is essential. The public half offers real opportunity, but hunters will want to identify exactly where public parcels lie relative to deer concentrations, water sources, and travel corridors before the season starts. There is no wilderness designation in this unit (0%), meaning no special wilderness access restrictions apply, and motorized access to public lands is not limited by wilderness boundaries the way it would be in a wilderness-heavy unit.

Given the terrain range, hunters glassing for mule deer here should plan to cover both the lower sagebrush/foothill country and the mid-to-upper elevation timber and basins, since deer will use different elevation bands depending on the timing of the hunt and weather patterns. HuntPilot's map tools, including public land overlays, can help hunters pinpoint exactly where the public 50% lies within Unit 23's boundaries and plan scouting routes accordingly.

Trophy Quality

The counties that overlap Unit 23 carry a strong trophy history in the record books. This region of northwest Colorado has a long-standing reputation among mule deer hunters as one of the state's better trophy-producing areas, and the qualitative data available supports that reputation. However, it's important to understand the caveat here: trophy records are attributed at the county level, not the unit level. That means the record-book entries associated with Unit 23's overlapping counties are shared with neighboring units — the animals scored may well have come from adjacent units rather than Unit 23 specifically.

That said, a strong regional trophy history combined with a genuine limited-quota structure (no general season diluting hunter pressure with high-volume, lower-quality hunts) is a favorable combination for hunters specifically targeting a mature buck. The low buck:doe ratio noted in the 2024 survey does introduce some uncertainty about how many mature bucks are currently in the population, but a single year of survey data is not enough to definitively say trophy potential has declined — it's simply a data point hunters should be aware of rather than a verdict.

Hunters drawing a tag here should expect that finding a genuinely trophy-class buck will require effort, scouting, and patience rather than an assumption that the unit's history guarantees an easy trophy encounter.

Harvest Success Rates

Harvest success in Unit 23 has varied considerably across the three most recent years of data. In 2025, success jumped to 49% among 7,274 hunters, resulting in 3,587 harvested animals — by far the highest hunter participation and success rate of the three years reviewed. In 2024, only 1,130 hunters hunted the unit with a 26% success rate (299 harvested), and in 2023, 564 hunters posted a 28% success rate (156 harvested).

The dramatic increase in both hunter numbers and success rate between 2023-2024 and 2025 is notable and suggests something changed in how hunts were structured or allocated in the unit — whether that's additional hunt codes added to the unit total, a shift in quota, or another factor isn't clear from the available data. Hunters should not assume the 2025 success rate of 49% is representative of what a typical draw hunt in this unit looks like going forward; the two prior years, with success rates in the mid-to-high 20% range, may be more indicative of the year-to-year baseline for standard limited-quota hunts in Unit 23.

Because these figures represent unit-wide totals across all limited-quota hunt types rather than being broken out by specific hunt code, hunters pulling a tag here should use HuntPilot's unit-specific data tools to see if more granular harvest breakdowns are available for their exact hunt code before setting expectations.

Herd Health & Population Trends

The only wildlife survey data available for Unit 23 covers a single year, 2024, showing an average buck:doe ratio of 29:100. This is a relatively low ratio and, with just one year of data, should be interpreted cautiously. A single survey year doesn't establish a trend — it's a snapshot, and survey sample sizes can vary significantly from year to year, which affects reliability.

Hunters should not read too much into this single data point as either a red flag or a green light. Without multi-year survey history to compare against, it's not possible to say whether 29:100 represents a stable pattern, a declining trend, or simply survey variability. Hunters considering Unit 23 should watch for updated survey data in subsequent years, which will offer a clearer picture of whether buck numbers relative to does are improving, holding steady, or declining.

How to Apply

Colorado's mule deer draw system operates on a preference point structure, where the state's highest point holders draw available tags first — this makes Colorado a true preference system, not a weighted lottery. A sufficiently high point level can effectively guarantee a tag on many hunts over time, though this varies by specific hunt code and applicant residency.

Since Unit 23 has no general season, every hunter — resident or nonresident — must apply through Colorado's draw system to hunt mule deer here. Residents and nonresidents apply through separate pools, and nonresidents should expect the draw to be more competitive given Colorado's overall popularity as a mule deer destination and the strong regional trophy reputation associated with the White River area.

Successfully drawing a tag consumes accumulated preference points for that species, meaning hunters who draw a Unit 23 tag will restart their point total from zero (or near zero) for future mule deer applications. Because Unit 23 is entirely limited-quota, hunters without points may still have some opportunity depending on how leftover or secondary draw tags are allocated in a given year — as referenced in hunter discussion of the unit, some tags have historically become available through secondary or leftover draw processes.

Application dates and fees change every cycle. For the current deadlines, fees, and draw odds specific to Unit 23, hunters should check HuntPilot's Colorado state page at /states/CO, which reflects the most current application windows and draw statistics.

Frequently Asked Questions

Is Colorado Unit 23 a draw-only unit for mule deer? Yes. Unit 23 has no general season for mule deer — every hunt, including those for antlered bucks, is limited-quota and requires a successful draw application. There is no over-the-counter or general-license option for hunting deer in this unit.

What is harvest success like in Unit 23? Harvest success has varied significantly in recent years. The 2025 season posted a 49% success rate among 7,274 hunters, while 2024 and 2023 saw lower success rates of 26% and 28%, respectively, with far fewer hunters afield (1,130 and 564). The 2025 spike stands out from the prior two years and may not represent the typical baseline for the unit.

How big are the mule deer in Unit 23? The counties overlapping Unit 23 carry a strong regional trophy history, suggesting solid trophy potential for hunters willing to put in scouting time. However, trophy records are attributed at the county level and shared with neighboring units, so this reputation reflects the broader White River area rather than being exclusive to Unit 23. A single year of survey data showing a low buck:doe ratio (29:100 in 2024) introduces some uncertainty about current mature buck numbers, so hunters shouldn't assume trophy success is guaranteed.

What is the terrain like in Unit 23? The unit spans a wide elevation range from 6,093 to 10,096 feet, offering a mix of lower sagebrush and foothill terrain up through higher timbered country, though it reportedly holds somewhat less high country above 10,000 feet compared to some neighboring units. With 50% public land and no wilderness designation, hunters have solid access to public ground but need to carefully map ownership boundaries given the near-even public/private split.

Is Unit 23 worth applying for? For hunters with points to spend and a willingness to scout thoroughly, Unit 23 has real appeal thanks to its strong regional trophy history and meaningful public land access (50%). However, the inconsistent harvest success across recent years and a low single-year buck:doe survey ratio suggest hunters should temper expectations of an easy tag-filling experience and plan for a genuine hunt requiring effort and patience.