Idaho Unit 28 Bighorn Sheep Hunting Guide

Idaho Unit 28 sits among the state's most talked-about bighorn sheep country, and for good reason — this is a limited-quota-only unit where every tag on offer, including tags for rams, comes through the draw rather than any general season. For hunters chasing bighorn sheep in Idaho, Unit 28 is a unit worth understanding in detail before committing points or planning a season around it, and the harvest data, terrain profile, and trophy history all factor into that decision.

Spanning 837,752 acres with elevations ranging from 3,017 feet up to 9,916 feet, Unit 28 offers the kind of vertical relief and rugged topography that bighorn sheep favor — steep rock, broken terrain, and a mix of low-elevation canyon country and high alpine basins. With 98% of the unit in public ownership and 14% designated wilderness, access is about as good as it gets for a DIY sheep hunter willing to put in the physical work required to hunt this species properly.

HuntPilot Analysis: Is Unit 28 Worth Applying For?

Unit 28 checks several important boxes for a serious bighorn sheep applicant. First, the hunt structure is entirely limited-quota — there's no general season diluting tag quality here, which means every hunter afield is hunting under a controlled, draw-only framework designed to protect the herd and the hunting experience alike. That structure alone tends to correlate with better opportunity per tag than units where pressure is unrestricted.

Second, the access picture is excellent. At 98% public land, DIY hunters have almost the entire unit available to them, and the 14% wilderness component adds a meaningful backcountry element without creating the kind of near-total wilderness lockup that complicates logistics in some western units. This is a unit where a hunter can genuinely plan and execute a self-guided hunt across nearly the whole landscape.

Third, and most importantly for anyone chasing a wall-hanger, the counties overlapping Unit 28 carry a strong history of trophy-class ram production. That history is shared across neighboring units in those counties — it isn't proof that any single ram was taken inside Unit 28's boundary specifically — but it does indicate this general region of Idaho has consistently produced rams worthy of note over time. Combined with the harvest data below, that trophy pedigree makes Unit 28 a legitimate priority unit for hunters serious about bighorn sheep.

The harvest numbers, however, come with some nuance hunters need to understand before assuming this is an easy tag to fill.

Harvest Success Rates

Unit 28's harvest data over the past six years shows real variability, which is common in low-tag-volume bighorn sheep units where a handful of hunters can swing the percentage dramatically:

• 2025: 21 hunters, 10 harvested — 48% success
• 2024: 16 hunters, 13 harvested — 81% success
• 2023: 19 hunters, 12 harvested — 63% success
• 2022: 25 hunters, 8 harvested — 32% success
• 2021: 68 hunters, 38 harvested — 56% success
• 2020: 77 hunters, 43 harvested — 56% success

A few patterns stand out. Success rates have swung from a low of 32% in 2022 to a high of 81% in 2024, which is typical of a unit where total hunter numbers are small enough that a few individual outcomes shift the percentage significantly. Looking at the six-year window as a whole, success has generally hovered in the 48-63% range in most years, with 2024's 81% standing out as an outlier on the high end and 2022's 32% as the low outlier.

It's also worth noting the drop in hunter numbers over time — from 77 hunters in 2020 down to 21 in 2025 — which likely reflects tightening tag quotas as the state manages herd health and hunter pressure. Fewer hunters in the field generally means more effort concentrated per animal, but it also means fewer total tags available for hunters hoping to draw. Whatever the cause, the multi-year trend of roughly half to two-thirds of hunters connecting on a ram is a solid baseline for a species notorious for testing patience and physical endurance more than most other western big game.

Trophy Quality

Bighorn sheep hunting in Idaho's Unit 28 benefits from being embedded in a region with a strong overall trophy record. The counties overlapping this unit have consistently produced rams that make the record books, a pattern that has held across multiple hunting seasons rather than being a one-off event. That said, hunters need to keep the county-level caveat in mind: those trophy entries are attributed to the broader county geography, which overlaps not just Unit 28 but neighboring units as well. A trophy ram credited to the county could have come from anywhere within that shared boundary.

Still, taken together with the unit's terrain — big elevation swings, extensive public access, and a wilderness component that limits pressure in the roughest country — Unit 28 has the ingredients associated with strong trophy potential. Hunters willing to scout hard and hunt the steepest, least-accessible pockets of the unit stand a real chance at connecting with a mature ram, and the regional trophy history supports that this isn't a fluke occurrence but a sustained pattern.

Access & Terrain

Unit 28 is about as accessible as a bighorn sheep unit gets in terms of land ownership. With 98% public land across 837,752 acres, hunters are rarely boxed out by private ground, and there's enough room to spread out and hunt multiple basins or drainages across a season without bumping into other hunters constantly — a real consideration in a unit where the total draw is intentionally kept small.

The terrain itself is defined by dramatic elevation change, running from valley floors around 3,017 feet up to alpine peaks near 9,916 feet. That nearly 7,000-foot vertical range means hunters need to be prepared for multiple terrain types within a single hunt — lower-elevation canyon and rimrock country transitioning into high alpine basins and rocky escarpments where mature rams often bed and feed. Physical conditioning matters enormously here; covering that kind of vertical relief on foot, glassing from ridge to ridge, is the default mode of hunting in country like this.

The 14% wilderness designation adds another dimension. It's not so extensive that it locks hunters into guide-only logistics (Idaho doesn't carry Wyoming's wilderness guide mandate for nonresidents in any case), but it does mean a meaningful chunk of the unit is roadless, foot-and-horseback country where sheep can find refuge from pressure. Hunters who are willing to push into that wilderness portion, rather than staying close to accessible roads, often improve their odds of finding an unpressured, mature ram.

For scouting purposes, hunters should use mapping tools — including HuntPilot's own public land and terrain overlays — to identify likely glassing points along the transition zones between lower canyon terrain and the high basins, and to distinguish the wilderness boundary from the surrounding public land so a hunt plan can account for both foot access and any horse or pack-support logistics.

How to Apply

Idaho's bighorn sheep tags in Unit 28 are allocated entirely through the state's controlled hunt draw system — there is no general season alternative here, so drawing a tag is the only path to hunting this unit. Idaho's draw process does not use a preference point or bonus point system in the way some neighboring states do; every applicant's odds are determined by the current year's tag quota and application pool rather than by accumulated point history.

Both residents and nonresidents apply through the same controlled hunt application process, though nonresidents should expect the application to require a hunting license purchase and adherence to Idaho's nonresident tag caps for sheep species. Because this is bighorn sheep — one of the most heavily regulated and biologically sensitive species in western big game management — hunters should also expect mandatory reporting requirements and potentially a mandatory orientation or check-in process tied to any harvested ram.

Application windows, fees, and current-year quota numbers change annually and are not included here. For the most current deadlines, fees, and application details, visit HuntPilot's Idaho state page at /states/id or the Unit 28 page directly for the latest structured data.

Frequently Asked Questions

What is the terrain like in Idaho Unit 28? Unit 28 features dramatic elevation change, from around 3,017 feet at its lowest points to 9,916 feet at its highest. Hunters can expect a mix of lower-elevation canyon and rimrock terrain transitioning into steep, rocky alpine basins — classic bighorn sheep habitat that demands strong physical conditioning and a willingness to cover significant vertical ground on foot.

What is harvest success like for bighorn sheep in Unit 28? Over the past six seasons, harvest success has ranged from a low of 32% in 2022 to a high of 81% in 2024, with most years falling in the 48-63% range. Hunter numbers have also declined from 77 in 2020 to 21 in 2025, reflecting tightening tag allocations over time. Overall, roughly half to two-thirds of hunters who draw a tag in Unit 28 connect on a ram in a typical year.

How big are the bighorn sheep in Unit 28? Specific scores aren't published here, but the counties overlapping Unit 28 have a strong history of producing trophy-class rams over multiple seasons. Because trophy records are logged by county rather than by unit boundary, that history is shared with neighboring units as well — but it does indicate this broader region has a sustained track record of quality ram production.

Is Unit 28 worth applying for? Based on the available data, yes — Unit 28 combines a fully limited-quota hunt structure, exceptional public land access at 98%, meaningful wilderness terrain, and a regional trophy history that supports strong ram potential. The harvest success trend, while variable year to year, generally favors hunters who draw a tag. For hunters focused on bighorn sheep with a serious commitment to physical preparation and scouting, this unit deserves strong consideration.

Does Unit 28 require a guide for nonresidents? No. Idaho does not impose Wyoming-style wilderness guide requirements on nonresident hunters. Nonresidents can hunt Unit 28's wilderness and non-wilderness portions alike as DIY hunters, provided they hold a valid Idaho hunting license and have successfully drawn a controlled hunt tag for bighorn sheep in this unit.