Colorado Unit 103 Mule Deer Hunting Guide
Colorado Unit 103 is a limited-quota mule deer unit that sits at relatively low elevation for the state — ranging from 3,506 to 3,943 feet — across 82,370 total acres. Hunters researching this unit will find a landscape that departs from the alpine stereotype many associate with Colorado mule deer country, and a draw structure that puts every hunter on equal footing: there is no general season here. Every mule deer hunt in Unit 103 is limited-quota, meaning hunters must draw a tag before they can hunt, regardless of residency.
That draw-only structure is the single most important fact for anyone building a strategy around this unit. There's no walk-in, over-the-counter fallback plan in Unit 103 — a hunter either holds a drawn tag for a specific hunt code or they don't hunt deer here that year. With only 21% of the unit under public ownership, access planning also has to start well before a hunter sets foot in the field.
Recent harvest data shows Unit 103 produces meaningful opportunity for those who do draw. In the 2025 season, 1,400 hunters took to the field and harvested 453 deer, a 32% success rate. That follows a similar pattern from 2024 (770 hunters, 245 harvested, 32% success) and 2023 (692 hunters, 207 harvested, 30% success). The jump in hunter numbers from 2023 and 2024 into 2025 — nearly doubling — is worth noting for anyone trying to gauge how competitive the unit has become, though it hasn't come at the cost of success rate, which has held steady in the low 30s percent range across all three years.
HuntPilot Analysis: Is Unit 103 Worth Applying For?
The honest answer is that Unit 103 earns a qualified yes, with some real caveats hunters need to weigh before committing points or cash to it.
On the positive side, the harvest numbers are consistent and respectable. A 30-32% success rate held across three consecutive years (2023-2025) tells HuntPilot's data that this isn't a unit where success is a coin flip dependent on one good year — there's a repeatable pattern of hunters finding and killing deer here. For a limited-quota unit, that kind of consistency is a real asset, especially compared to units where success swings wildly year to year based on weather or migration timing.
The trophy picture adds real weight to the case for applying. The counties overlapping Unit 103 carry a strong history of trophy-class deer production, which gives hunters a legitimate reason to view this as more than just a numbers unit. Combined with a buck:doe ratio that — while based on a single survey year — came in at 36:100 in 2024, there's at least some indication of a herd structure that can produce mature bucks, though hunters should treat that single-year ratio with appropriate caution rather than as a long-term trend.
The clear downside is access. At just 21% public land, Unit 103 is majority private property. That's a critical fact for any hunter building a DIY plan — the limited public ground means careful pre-season scouting, map work, and a realistic plan for where a hunter can legally be is not optional, it's mandatory. Hunters who assume they'll find wide-open public access here, the way they might in units with 60-70% public ownership, will be disappointed and potentially boxed into a small sliver of huntable ground. This unit rewards hunters who either have access to private land connections or who are willing to do the legwork identifying the public parcels that do exist and hammering them hard during a short season.
The jump in hunter pressure between 2024 and 2025 (more than doubling from 770 to 1,400 hunters) is also something to watch. If that trend continues, a unit with already-limited public access could see success rates compress as more hunters compete for the same finite public ground, even if overall harvest increases.
Bottom line: Unit 103 is worth applying for if a hunter has done their homework on access — ideally with some private ground in their back pocket, or the patience to scout the public inholdings hard before the season — and is drawn by the combination of solid, consistent harvest success and a trophy pedigree tied to the surrounding counties. It is not a unit for hunters expecting easy, wide-open public land access.
Herd Health & Population Trends
The data available for Unit 103 is limited to a single survey year (2024), which showed an average buck:doe ratio of 36:100. That's a modest ratio by mule deer standards — well below the 40:100 threshold that would suggest an unusually buck-heavy herd — and with only one year of data, HuntPilot's analysis can't confirm whether this represents a stable long-term pattern or a single snapshot. Hunters should treat this number as a baseline data point rather than a definitive statement on herd composition, and watch for additional survey years to establish a trend. What the harvest data does support, independent of the survey ratio, is a herd capable of sustaining 30%-plus success rates across multiple years without signs of decline — a reasonably healthy indicator in its own right.
Trophy Quality
Trophy data tied to the counties overlapping Unit 103 points to a strong history of trophy-class mule deer production in this part of Colorado. It's important for hunters to understand how this data works: record-book entries are logged at the county level, not the unit level, which means the trophy pedigree associated with this area is shared across Unit 103 and its neighboring units — the specific animals behind those records could have been taken anywhere within the overlapping counties, not necessarily inside Unit 103's boundaries.
That caveat aside, a strong trophy history in the surrounding counties is a meaningful signal. It suggests this part of the state has the genetics, forage, and age-class structure necessary to produce mature, record-class bucks on a recurring basis — not just a one-off anomaly from decades past. Combined with the buck:doe ratio data (thin as it is) and the unit's consistent harvest success, Unit 103 presents as a legitimate option for hunters specifically hunting for a mature buck rather than just filling a tag. Hunters should not expect every drawn tag holder to walk out with a record-book buck — most hunters in strong units like this still tag solid, representative deer rather than record-setters — but the upside exists here in a way it doesn't in units lacking any trophy history.
Access & Terrain
Access is the defining operational challenge in Unit 103. With only 21% of the unit's 82,370 acres under public ownership, the majority of this unit is private land. This is a hard fact that should shape every hunter's planning: DIY hunters cannot assume they'll find ample public ground to roam, and anyone drawing a tag here needs a specific plan for exactly where they intend to hunt before they show up.
The unit's elevation band — 3,506 to 3,943 feet — is notably low for Colorado mule deer country, and this matters for both terrain type and seasonal deer movement. Lower-elevation terrain in this range often means more open, arid country compared to the high alpine basins typical of many Western Slope units. There is no wilderness acreage in Unit 103, which means hunters won't be dealing with the access restrictions or foot/horseback-only travel requirements that come with designated wilderness areas elsewhere in the state — but it also means there's no wilderness-driven refuge pushing deer away from roads and pressure, which can concentrate hunting pressure on the accessible public pieces that do exist.
Given the low public land percentage, hunters serious about this unit should invest time in identifying the exact boundaries of public parcels using mapping tools before the season opens. HuntPilot's unit data and mapping tools can help hunters pinpoint where public and private boundaries fall within Unit 103, which is essential homework in a unit this access-constrained.
How to Apply
Unit 103 has no general season for mule deer — every opportunity to hunt this unit comes through Colorado's limited-quota draw system. There is no over-the-counter fallback option here; a hunter needs a drawn tag specific to this unit and hunt code in order to legally hunt.
Colorado's draw system is a true preference point system, which means the state's highest point holders draw first for any given hunt, and a sufficiently high point level can guarantee a tag in many cases. This differs from weighted-lottery systems used in other states — Colorado residents and nonresidents both accumulate points annually when they apply and don't draw, and those points directly improve standing in future draws. Resident and nonresident applicants compete in separate pools, with nonresidents generally facing steeper point requirements for the more sought-after hunts.
Because Unit 103 is limited-quota only, hunters without points in hand should expect this to be a longer-term play rather than a same-year opportunity, particularly given the trophy potential tied to the surrounding counties — units with strong trophy reputations tend to draw more applicant interest over time. Point creep is a real phenomenon in Colorado's system, so hunters serious about this unit should begin applying and accumulating points as early as possible rather than waiting.
Application dates, fees, and current draw odds all change from cycle to cycle. For the most current information on deadlines, costs, and draw statistics specific to Unit 103, hunters should check HuntPilot's Colorado state page at /states/CO, which reflects the live, current-cycle numbers.
Frequently Asked Questions
What is the terrain like in Colorado Unit 103? Unit 103 sits at a relatively low elevation for Colorado mule deer country, ranging from 3,506 to 3,943 feet, with no designated wilderness acreage. This generally translates to more open, lower-elevation terrain compared to the high alpine basins found in many other Western Slope units. Specific vegetation and terrain features beyond elevation aren't detailed in the available data, so hunters should use mapping tools to study the unit's public parcels directly.
What is harvest success like in Unit 103? Harvest success has been consistent across recent seasons: 32% in 2025 (453 of 1,400 hunters), 32% in 2024 (245 of 770 hunters), and 30% in 2023 (207 of 692 hunters). That's a solid, repeatable success rate for a limited-quota mule deer unit, though hunter participation nearly doubled between 2024 and 2025, which is worth watching for future success-rate trends.
How big are the mule deer in Unit 103? The counties overlapping Unit 103 carry a strong history of trophy-class mule deer production, suggesting this part of the state has produced mature, record-caliber bucks on a recurring basis. Because trophy records are tracked by county rather than by individual unit, this trophy pedigree is shared with neighboring units in the same county footprint — it reflects the region's potential rather than a guarantee specific to Unit 103's boundaries alone.
Is Unit 103 worth applying for? Yes, with a significant caveat on access. The unit offers consistent harvest success in the 30-32% range over the past three years and sits in a county footprint with a strong trophy history — both solid reasons to apply. However, at just 21% public land, the majority of the unit is private property, meaning DIY hunters need a specific, well-researched access plan before applying. This is not a unit suited to hunters expecting open, easy public-land access.
What does the buck:doe ratio tell hunters about Unit 103's deer herd? The only available survey data comes from a single year (2024), showing a 36:100 buck:doe ratio. That's a modest, believable ratio — not an outlier requiring suspicion — but with just one year of data, it's not enough to establish a confirmed trend. Hunters should view it as a starting data point and watch for future survey years before drawing firm conclusions about herd structure or age-class distribution.