Montana Unit 400 Mule Deer Hunting Guide

Montana Unit 400 sits in the lower-elevation plains and agricultural country of central Montana, covering just over 1.2 million acres at elevations ranging from 2,554 to 3,763 feet. Despite its massive footprint, this unit presents a fundamentally different access challenge than most western deer hunts: only 13% of the unit is public land. That single statistic defines every strategic decision a deer hunter needs to make before applying. Hunters who understand this unit's land tenure reality — and plan accordingly — can find legitimate opportunity here. Those who don't will spend their tag sitting at locked gates.

Unit 400 draws a significant number of applicants each year, and the harvest data reflects a steady, consistent deer hunting operation. With 3,836 hunters in the field in 2023 and 1,314 deer harvested, the unit posted a 34% success rate — a figure that held nearly identically from 2021, when 3,538 hunters produced 1,196 harvested animals at the same 34% rate. That consistency tells you something important: this isn't a boom-and-bust unit. The deer population is stable, hunting pressure is predictable, and the harvest machine runs reliably year over year. What it doesn't tell you is whether that success rate is accessible to a hunter without private land connections.

HuntPilot Analysis: Is Montana Unit 400 Worth Applying For?

Unit 400 is a unit that rewards hunters who do their homework on land access — and punishes those who don't. The math is straightforward: 87% of this unit's 1.2 million acres is private land. For hunters without landowner relationships, access to Block Management Area (BMA) parcels enrolled through Montana's walk-in hunting program, or the ability to knock on doors and secure permission, the huntable acres shrink dramatically.

That said, the 34% success rate recorded in both 2021 and 2023 is competitive for a deer unit of this size and pressure level. Hunters are finding deer and killing deer here. The flat-to-rolling terrain at these elevations — characteristic of Montana's agricultural plains country — can hold excellent deer numbers in the right conditions, and the low elevation means minimal weather barrier for hunters accessing the unit without pack-in capability.

The trophy picture is moderate for this part of Montana. The counties overlapping Unit 400 have a moderate history of trophy-class deer production, which is consistent with what hunters should expect from agricultural plains country. This isn't a unit known for producing exceptional bucks at high frequency, but genuine trophy-class animals have been taken here.

The honest bottom line: Unit 400 is worth applying for if hunters have a concrete access plan before they apply. Hunters relying entirely on public land will find it a frustrating experience given the 13% public land figure. Hunters with landowner permission, BMA access, or a private land lease arrangement will find a unit with predictable success rates and real deer. The $5 application fee keeps the cost of entry low enough that it's worth a shot while hunters simultaneously pursue higher-priority units. For current draw odds, visit the HuntPilot Montana unit page before submitting an application.

Harvest Success Rates

The harvest data from Unit 400 tells a story of remarkable consistency. In 2023, 3,836 hunters took to the field and 1,314 made good on their tags — a 34% success rate. Two years prior in 2021, 3,538 hunters produced 1,196 harvested deer, again at 34%. When a unit holds the same success rate across different hunter pressure levels and different seasons, it suggests a stable deer population with predictable hunting dynamics rather than a herd that swings dramatically year to year.

For context, a 34% overall unit success rate in a large Montana deer unit is solid, not spectacular. It means roughly one in three hunters fills their tag. The hunters succeeding are almost certainly those with private land access — the 13% public land figure makes it difficult to attribute much of that harvest to walk-in public hunters alone. Hunters targeting BMA-enrolled parcels, which can shift year to year, may find variable access depending on which landowners participate in a given season. Verify current BMA enrollment through Montana Fish, Wildlife & Parks before finalizing any hunt plan.

Trophy Quality

Based on the trophy record history from the counties overlapping Unit 400, this unit carries moderate trophy potential for mule deer. Agricultural plains country at these elevations can produce respectable bucks, and the unit has generated trophy-class animals over time — but it is not among Montana's premier trophy mule deer destinations. Hunters prioritizing maximum trophy potential should understand that Unit 400 sits in the middle tier of Montana's deer units when it comes to big-buck production.

That moderate assessment doesn't mean exceptional bucks are absent — they're taken here — but the frequency is lower compared to units in more isolated, lightly pressured terrain. The combination of significant private land (which can protect older-age-class bucks from hunting pressure when landowners manage access carefully) and the unit's size means that trophy deer exist but are not evenly distributed across huntable acres. Hunters with private land access to parcels that see limited pressure have a better chance at finding a mature buck than those hunting dispersed public land.

Access & Terrain

Unit 400's terrain is defined by its elevation range: 2,554 to 3,763 feet, a relatively modest 1,200-foot spread that points to rolling plains, coulees, creek drainages, and agricultural fields rather than steep mountain country. This is the kind of terrain where deer hunting is done on foot across open country, glassing from elevated points, and stillhunting through riparian corridors and breaks. Packing in horses or camping at elevation is not a factor at these elevations — hunters can typically access the unit from a vehicle camp.

The critical constraint, as emphasized throughout this guide, is that 13% public land figure. With just over 1.2 million total acres in the unit, that works out to roughly 157,000 acres of public ground spread across a massive geographic footprint. How that public land is distributed matters enormously — scattered parcels surrounded by private land can be difficult to reach or may be too small to hunt effectively. There is zero designated wilderness in Unit 400, so nonresident hunters face no guide requirement under Montana law.

Hunters planning a DIY public-land approach should:

• Map all public parcels before the season using current land ownership layers
• Identify BMA-enrolled properties through Montana FWP's annual BMA hunting guide
• Focus scouting effort on public parcels adjacent to private land where deer may cross
• Be prepared for the reality that competition for limited public access points can be significant given the number of hunters this unit draws

The low-elevation, open-country character of Unit 400 also means weather is less of a logistical barrier than in alpine units. Hunters can typically access the unit in standard hunting vehicles without specialized equipment, which contributes to the high annual hunter numbers.

Herd Health & Population Trends

The harvest data available for Unit 400 — 2021 and 2023 — shows a unit that has absorbed increasing hunter pressure without a meaningful drop in success rate. From 2021 to 2023, the number of hunters increased by approximately 300 hunters (from 3,538 to 3,836), yet the success rate held constant at 34%. The raw harvest increased correspondingly from 1,196 to 1,314 animals.

This flat success rate under rising pressure is generally a positive signal for herd health: the deer population is producing enough harvestable animals to absorb the offtake without efficiency declining. It doesn't necessarily indicate herd growth, but it suggests population stability. Hunters should be aware that Montana FWP adjusts antlerless permit availability based on population monitoring, and changes in antlerless tag allocations from year to year can indicate management direction. The 2026 draw calendar includes both regular and antlerless permit categories for both residents and nonresidents, suggesting ongoing management of both segments of the herd.

How to Apply

For the 2026 draw, applications for Unit 400 deer permits open March 1, 2026 and close April 1, 2026. Results are released April 15, 2026. These dates apply to all applicant categories: resident regular, resident antlerless, nonresident regular, and nonresident antlerless.

The application fee for all categories is $5.

Resident hunters should note the following 2026 fee structure:

• Regular tag: $10 tag fee + $8.00 license fee (required to apply) + $5 application fee + $2 point fee
• Antlerless tag: $8 tag fee + $8.00 license fee (required to apply) + $5 application fee + $2 point fee

Nonresident hunters should note the following 2026 fee structure:

• Regular tag: $125 tag fee + $65.00 license fee (required to apply) + $5 application fee + $20 point fee
• Antlerless tag: $75 tag fee + $65.00 license fee (required to apply) + $5 application fee + $20 point fee

Important: Montana requires hunters to hold the appropriate hunting license before submitting a draw application. The license fee is a separate, required cost — not an optional add-on. Budget for both the application fee and the license fee when calculating your total application cost.

Montana uses a bonus points system for deer draws, meaning your entries in the draw increase with accumulated points. This improves draw odds over time but does not guarantee a tag in any given year. For current unit-specific draw odds and applicant data, visit HuntPilot's Montana page — this is the most efficient way to assess your chances before the April 1 deadline.

Applications are submitted through Montana FWP's online licensing system. Have your license, residency documentation, and payment method ready before the March 1 open date.

Dates and fees are subject to change. Always verify current application details at the Montana FWP website before applying.

Frequently Asked Questions

What is the terrain like in Montana Unit 400? Unit 400 is low-elevation plains and agricultural country, ranging from 2,554 to 3,763 feet. Hunters should expect rolling terrain, coulees, creek drainages, and open country rather than steep mountain hunting. The modest elevation spread and lack of wilderness means the unit is accessible by standard vehicle without specialized pack-in equipment. The open character of the terrain favors glassing-based hunting tactics.

What is the harvest success rate in Montana Unit 400? Unit 400 has posted a consistent 34% overall success rate across recent seasons — 1,314 deer harvested from 3,836 hunters in 2023, and 1,196 from 3,538 hunters in 2021. That consistency across different hunter pressure levels suggests a stable deer population. However, hunters should understand that the 13% public land percentage means success rates likely skew significantly toward hunters with private land access.

How big are the deer in Montana Unit 400? Based on trophy record history from the counties overlapping Unit 400, the area carries moderate trophy potential. Trophy-class bucks have been taken here, but this is not among Montana's top-tier mule deer destinations for consistent big-buck production. Agricultural plains country can hold respectable mature bucks, particularly on private land where older-age-class animals can reach their potential, but hunters targeting maximum trophy quality should prioritize units with stronger trophy histories.

Is Montana Unit 400 worth applying for as a nonresident? It depends entirely on access. The $5 application fee and relatively low nonresident license cost make it a low-risk application, but nonresidents without a private land access plan will be working with roughly 157,000 acres of dispersed public ground in a unit that draws over 3,800 hunters annually. Nonresidents with landowner permission or a private land arrangement will find a predictable unit with a solid 34% success rate. Nonresidents hunting purely on public land should go in with realistic expectations and a detailed pre-season access plan. Check current draw difficulty at HuntPilot's Montana draw page before committing to an application strategy.

Does Montana Unit 400 have any guide or wilderness requirements? No. Unit 400 contains no designated wilderness and sits at low elevation on plains terrain. Montana does not have the same nonresident guide requirement that Wyoming imposes in wilderness areas — nonresident hunters can pursue deer in Unit 400 on a DIY basis without hiring a guide. This makes it one of the more accessible Montana units from a regulatory standpoint, even if private land dominance creates its own access challenges.