Idaho Unit 40 Mule Deer Hunting Guide

Idaho Unit 40 sits in the southwestern corner of the state and has built a reputation among mule deer hunters as a big-ground, big-buck destination that demands patience — both in the field and in the draw line. Spanning nearly 1.45 million acres with elevations ranging from 2,201 to 8,335 feet, Unit 40 offers the kind of vertical and horizontal terrain diversity that makes for a genuine western mule deer hunt: sagebrush breaks, timbered high country, and everything in between.

With 80% public land, Unit 40 gives hunters plenty of room to roam without needing to lean heavily on private access — a rarity in some of Idaho's better mule deer country. There's no wilderness acreage tallied for this unit, meaning access is largely road- and trail-based rather than requiring pack-in wilderness travel, though the sheer size of the unit still means covering serious ground on foot is part of the game.

This article breaks down what the data actually shows for Unit 40 — harvest trends, application logistics, and trophy potential — so hunters considering this unit can make an informed decision rather than relying on forum lore alone.

HuntPilot Analysis: Is Unit 40 Worth Applying For?

Based on the data available through HuntPilot, Unit 40 is a legitimate, well-rounded option for mule deer hunters willing to put in scouting time and physical effort. The unit posted a 33% success rate in 2025 (4,571 hunters, 1,507 harvested), a 34% success rate in 2024 (4,885 hunters, 1,645 harvested), and a 28% success rate in 2023 (4,754 hunters, 1,317 harvested). Those numbers reflect unit-wide totals across all mule deer hunts in Unit 40, not a single hunt type, but they show a consistent, high-volume hunt with success rates that have held in the high-20s to mid-30s range over three consecutive years — solid for a unit this size with this much public access.

The trophy history for the counties overlapping Unit 40 shows a moderate history of trophy-class mule deer, which lines up with what recurring hunters describe: the unit gives up good bucks to those who work for them, but it isn't a unit where trophy bucks are common or easy. This is consistent with forum accounts describing hunters covering large amounts of ground and needing to be selective about which buck they commit to.

The biggest factor working in Unit 40's favor is the combination of high public land percentage (80%) and large total acreage (nearly 1.45 million acres). That's a lot of huntable country without needing private land arrangements. The tradeoff is that with that much ground to cover, and thousands of hunters afield each year (over 4,500 in both 2024 and 2025), pressure is a real consideration, particularly near easier access points.

For hunters who want a physically demanding, do-it-yourself mule deer hunt with a fair shot at success and moderate trophy potential, Unit 40 is worth serious consideration — especially for Idaho residents, given the state's lottery-based draw system where every applicant has an equal shot regardless of application history.

Harvest Success Rates

Unit 40's harvest data over the past three years shows a hunt that consistently produces for roughly a third of participants:

• 2025: 4,571 hunters, 1,507 harvested — 33% success
• 2024: 4,885 hunters, 1,645 harvested — 34% success
• 2023: 4,754 hunters, 1,317 harvested — 28% success

The jump from 28% in 2023 to 33-34% in 2024 and 2025 suggests either improving herd conditions, better weather timing, or both. Hunter numbers have stayed relatively stable across all three years (between roughly 4,570 and 4,890), so the success rate swings appear tied to conditions rather than shifts in hunting pressure. These are unit-wide totals combining all mule deer hunt types in Unit 40, so individual hunt success — particularly for the more restrictive draw hunts described in forum discussions — will vary from the blended average.

Trophy Quality

The counties overlapping Unit 40 carry a moderate history of trophy-class mule deer entries. That record history is shared across the broader county area and the neighboring units within it, so it reflects the region's overall trophy potential rather than being unit-exclusive. What this tells hunters is that Unit 40 has produced quality bucks over time without being a unit defined by frequent record-book production. Forum accounts from hunters who've drawn Unit 40 tags echo this: bucks in the 160-170 class are considered good, solid results, and truly exceptional bucks are talked about as rare, memorable exceptions rather than the norm. Hunters going into Unit 40 should set realistic expectations — this is a unit where a mature, respectable buck is a well-earned trophy, and anyone holding out purely for a record-book animal may end up empty-handed given how infrequently those animals show up.

Access & Terrain

Unit 40 covers an enormous elevation gradient, from 2,201 feet up to 8,335 feet, which means hunters can encounter everything from low-elevation sagebrush and rangeland to high timbered ridgelines within the same unit boundary. That range in elevation typically corresponds to a range in deer behavior and movement, with bucks pushed toward lower elevations as weather intensifies later in the year.

With 80% of the unit in public ownership across nearly 1.45 million acres, access is a strength here — DIY hunters have substantial room to hunt without needing to negotiate private land access. There's no wilderness acreage recorded for Unit 40, so this isn't unguided wilderness travel country; it's more a mix of accessible public range and foothill/mountain terrain reachable by vehicle and foot travel.

That said, "public" doesn't mean "easy." Forum accounts consistently emphasize that success in Unit 40 requires covering serious ground — multiple hunters describe the unit as requiring hunters to "cover ground, lots of ground, then some more ground." The unit's size works against complacency; bucks that get pushed off easily-accessed terrain end up in the more remote pockets, and hunters willing to hike beyond the first ridge tend to see better results. Given the volume of hunters afield each season, areas near obvious access points see more pressure, so scouting for less-trafficked terrain within the unit's public land base is a worthwhile strategy. Hunters can use HuntPilot's mapping tools to overlay public land boundaries and identify pockets of public ground away from primary access corridors before heading into the field.

How to Apply

Idaho's draw system for deer is a straightforward lottery — there are no preference or bonus points involved, meaning every applicant, resident or nonresident, has the same odds each year regardless of how many times they've applied before. This is a key distinction from many neighboring states and means hunters shouldn't expect improved odds by "waiting it out"; each year's application is an independent draw.

Note that both residents and nonresidents must hold a qualifying license before applying — this license fee is separate from and in addition to the application fee, and must be purchased first.

Given the volume of applicants Unit 40 draws each year and the demand described repeatedly in hunter forums (some applicants report over a decade of unsuccessful attempts for certain hunt types), tags for the more restrictive hunt options in this unit are heavily contested. Hunters should check HuntPilot's Idaho state page (/states/id) for current draw statistics and hunt-specific application guidance before submitting.

Application dates and fees change every draw cycle. For the current deadlines, fees, and draw odds, see HuntPilot's Idaho page at /states/id.

Frequently Asked Questions

What is the terrain like in Unit 40?

Unit 40 spans a dramatic elevation range from 2,201 to 8,335 feet across nearly 1.45 million acres, covering everything from lower-elevation sagebrush rangeland to higher timbered mountain terrain. With 80% public land and no designated wilderness acreage, the unit is accessible by road and trail systems rather than requiring wilderness-style pack-in travel, but its sheer size means hunters need to be prepared to cover significant ground on foot to find less-pressured pockets of deer.

What is harvest success like in Unit 40?

Success rates have run 33% in 2025, 34% in 2024, and 28% in 2023 on a unit-wide basis, with hunter participation consistently in the 4,500-4,900 range each year. These are blended totals across all mule deer hunts in the unit, so success on specific hunt types may differ from the overall average.

How big are the mule deer in Unit 40?

Trophy records from the counties overlapping Unit 40 show a moderate history of trophy-class bucks, indicating the unit has produced quality deer over time without being defined by frequent record-book entries. Hunter accounts suggest a mature buck in the 160-170 class is considered a strong, realistic goal, with truly exceptional bucks being rare finds rather than a consistent occurrence.

Is Unit 40 worth applying for?

Based on the available data, yes — for hunters willing to put in the physical work. The combination of 80% public land, consistent harvest success in the high-20s to mid-30s percentage range over the past three years, and a moderate trophy history make Unit 40 a solid, realistic option, particularly for Idaho residents who face no point-based draw disadvantage under the state's lottery system. Nonresidents should weigh the higher tag and license costs against the unit's demand and realistic trophy expectations before applying.

How competitive is the draw for Unit 40 deer tags?

Idaho uses a pure lottery system with no preference or bonus points, so every applicant — regardless of application history — has equal odds each year. Certain hunt types within Unit 40 are described by repeat applicants as difficult to draw, with some hunters reporting many unsuccessful years running. Hunters should consult HuntPilot's Idaho unit pages for current draw statistics specific to each hunt option before applying.