Idaho Unit 20A Mule Deer Hunting Guide

Idaho Unit 20A is a backcountry-dominant unit covering 483,329 acres, nearly all of it public and almost all of it wild. With elevation ranging from 2,152 to 9,342 feet and 90% of the unit falling within designated wilderness, this is one of the more rugged and remote hunting opportunities in Idaho's central mountain country. For hunters researching Unit 20A, the headline numbers — 100% public land, 90% wilderness — tell most of the story before a single harvest statistic even enters the picture.

This is not a roadside unit. The combination of extreme elevation relief (over 7,100 vertical feet from bottom to top) and wilderness-level access restrictions means hunters here are earning every mile, typically on foot or with stock. Unlike many general-season units in Idaho where hunters complain about crowding and pressure concentrated near trailheads, 20A's terrain naturally disperses hunters across a massive footprint. That same remoteness is both the unit's biggest asset and its biggest logistical hurdle.

Idaho manages access to this unit through a mix of hunt structures. General season hunts are available here, including hunts for antlered and either-sex animals, meaning this is not a draw-only unit for hunters chasing a mature animal. In addition to the general season framework, Idaho also offers limited-quota draw hunts in 20A that include antlered and either-sex opportunities, giving hunters a second avenue into the unit with potentially different pressure dynamics and season structure.

HuntPilot Analysis: Is Unit 20A Worth Applying For?

Unit 20A earns a serious look for hunters who value remoteness and are physically prepared for wilderness-grade terrain. The data backs this up in a few key ways.

First, the access profile is about as good as it gets on paper: 100% public land means there's no checkerboard private ownership to navigate, no locked gates, no landowner permission to chase down. Every acre of this unit's nearly half-million acres is open to hunters who do the work to get there. The catch — and it's a significant one — is that 90% of that public land sits inside wilderness boundaries, which rules out mechanized access (no e-bikes, no ATVs) and typically means long foot or horseback approaches to productive country.

Second, harvest trends over the past four years show a unit that produces results but with real year-to-year variability. In 2024, 502 hunters harvested 159 animals for a 32% success rate — the strongest year in the recent dataset. That followed a similar trend in 2023, when 424 hunters posted a 30% success rate with 126 harvested. The 2025 season brought a moderate pullback, with 413 hunters harvesting 121 animals for a 29% success rate. All three of those years cluster in a tight, respectable band.

The outlier is 2022, when hunter numbers were roughly in line with other years (439) but success cratered to 16%, with only 72 animals harvested. That kind of swing — nearly half the success rate of surrounding years — is worth noting. It could reflect a tough snow year, a shift in animal distribution, or weather that hampered access into wilderness terrain late in the season. Whatever the cause, it's a reminder that even in a unit with strong multi-year averages, individual seasons can disappoint. Hunters should view the 29-32% success rates of 2023-2025 as the more representative baseline, while keeping 2022 in mind as evidence that this unit can have off years.

On trophy potential, the counties overlapping Unit 20A carry a strong history of producing trophy-class animals, based on record-book data compiled across the region. Because trophy entries are logged by county rather than by exact hunt unit, this record applies to the broader area shared with neighboring units — it should be read as a strong regional signal of quality genetics and age structure rather than a guarantee specific to 20A's boundaries alone. Combined with the unit's remoteness, which limits hunting pressure and allows animals to mature, this trophy history is a meaningful point in the unit's favor for hunters specifically chasing a mature, older-age-class animal rather than just filling a tag.

Taken together: Unit 20A is worth applying for if a hunter is prepared for genuine wilderness conditions, has the physical capacity and gear knowledge to operate in steep, high-elevation terrain far from roads, and is drawn to the regional trophy history. It is a poor fit for hunters wanting an easy-access, truck-camp style hunt, or those unwilling to commit to multi-day pack-in logistics.

Access & Terrain

The terrain profile in Unit 20A is defined by extremes. The elevation range — from 2,152 feet at the lowest drainages to 9,342 feet at the highest peaks — spans over 7,100 feet of vertical relief within a single unit. That's an enormous range, and it means hunters can expect to encounter nearly every terrain type Idaho's backcountry has to offer: low-elevation river bottoms and canyons, mid-elevation timbered slopes, and high alpine basins near treeline.

With 90% of the unit inside wilderness, motorized and mechanized access is off the table across the overwhelming majority of the landscape. Hunters should plan around foot travel or stock-supported pack trips rather than any kind of vehicle-based access strategy. The remaining 10% of non-wilderness land likely represents the more accessible fringe of the unit, where the handful of existing access points would be concentrated — and where hunting pressure is also likely to be heaviest, simply because it requires the least logistical investment to reach.

Because the unit is 100% public, there are no private land conflicts to plan around, which simplifies scouting in one sense: hunters can go essentially anywhere boots or hooves can carry them without worrying about trespass. The tradeoff is that there's also no easy way to shortcut the terrain. Hunters serious about scouting this unit should lean on mapping tools that layer public land boundaries with wilderness designations and elevation contours — HuntPilot's map tools are built for exactly this kind of unit, letting hunters identify drainages, elevation bands, and potential glassing points before committing to a pack-in plan. Given the scale of this unit at over 483,000 acres, narrowing down a specific drainage or elevation band in advance, rather than wandering in blind, is critical.

Hunters coming from more road-accessible units should budget significantly more time and physical preparation than they're used to. This is a unit where the terrain itself — not hunting pressure — is often the biggest variable in a hunter's success.

Trophy Quality

The counties overlapping Unit 20A have a strong trophy history, with regional record-book data pointing to consistent production of mature, trophy-class animals over time. Because record-book entries are attributed at the county level rather than to a specific hunt unit, this history reflects the broader area — shared with other units that overlap the same counties — rather than being an exclusive credit to 20A. Still, it's a meaningful indicator: areas that consistently produce trophy-class animals tend to have the habitat quality, genetics, and age structure to support mature animals, and a wilderness-dominant unit like 20A, with limited access and lower effective hunting pressure across most of its acreage, fits the profile of a place where animals can reach maturity.

Hunters chasing an exceptional, record-caliber animal should treat this trophy history as a strong supporting data point in favor of 20A, while recognizing that specific scores and entry counts are regional rather than unit-exact. The unit's remoteness is likely a real contributor to trophy potential here — less accessible terrain generally means less pressure, and less pressure generally means older animals surviving multiple seasons.

How to Apply

Idaho's draw system does not use preference points or bonus points — there is nothing to accumulate, bank, or build toward. Every application in Idaho's controlled hunt draw is an independent, pure random draw: tags are issued based on the number of tags available divided by the number of applicants for that specific hunt, and a hunter's odds are identical whether this is their first year applying or their fifteenth.

For Unit 20A, hunters have two distinct paths in. The general season framework covers antlered and either-sex hunts and does not require a draw — hunters can purchase a license and hunt the general season structure without entering a lottery, making this the more straightforward way to access the unit for most residents and nonresidents alike. Separately, Idaho also offers limited-quota draw hunts in 20A that include antlered and either-sex opportunities. These draw hunts typically offer a different hunt structure or reduced hunter density compared to the general season, which is why some hunters apply for them even when a general season option exists.

Residents and nonresidents both apply through the same random-draw system for the limited-quota hunts, though nonresident tag numbers and quotas are typically more restricted. Because Idaho's draw has no points system, there is no advantage to applying in prior years — hunters should simply apply every year for the hunt that best matches their goals, since each year stands alone.

Application structure, license requirements, and any quota details for both the general season and limited-quota hunts in 20A change from year to year. For current deadlines, fees, and the latest application requirements, see HuntPilot's Idaho state page.

Frequently Asked Questions

What is the terrain like in Idaho Unit 20A? Unit 20A is defined by extreme vertical relief, ranging from 2,152 feet to 9,342 feet in elevation, and is almost entirely wilderness terrain (90% of the unit). Expect steep, remote, foot- or stock-access-only country with minimal road infrastructure. The unit is 100% public land, so access isn't limited by ownership, but it is heavily limited by terrain difficulty and the lack of motorized access inside wilderness boundaries.

What is harvest success like in Unit 20A? Success rates have run between 16% and 32% over the past four seasons. The 2024 season produced the strongest results at 32% (159 harvested out of 502 hunters), followed by 2023 at 30% (126 of 424) and 2025 at 29% (121 of 413). The 2022 season was a notable low point at 16% success (72 of 439 hunters), showing that this unit can have significant year-to-year swings despite steady hunter numbers.

How big are the animals in Unit 20A? The counties overlapping Unit 20A have a strong history of producing trophy-class, record-book animals. Since these records are logged at the county level and shared with neighboring units, they reflect regional trophy potential rather than a guarantee specific to 20A's exact boundaries. Combined with the unit's remote, wilderness-dominant character, the conditions here favor animals reaching maturity.

Is Unit 20A worth applying for? Yes, for the right hunter. The combination of 100% public land, strong regional trophy history, and consistent success rates in the high-20s to low-30s percent range over three of the last four years makes this a legitimate option — particularly for hunters prepared for the physical demands of wilderness-grade terrain. It's a poor match for hunters seeking easy road access or a low-effort hunt.

Do I need a guide to hunt Unit 20A? Idaho does not impose a state-mandated outfitter requirement for nonresidents hunting wilderness areas, unlike some neighboring states. That said, given the unit's 90% wilderness designation, extreme elevation range, and lack of road access, many nonresident hunters choose to hire a local guide or outfitter to navigate the logistics of a multi-day pack-in hunt, even though it isn't legally required.