Oregon Unit 566A Bighorn Sheep Hunting Guide

Oregon Unit 566A is one of the state's premier limited-quota bighorn sheep hunting destinations, and for hunters chasing one of the most difficult tags to draw in western big game hunting, it deserves a hard look. This is a unit defined by scarcity — of tags, of hunters, and of opportunity — set across nearly 1.2 million acres of rugged, arid country in the eastern part of the state. Every hunt here runs through the draw; there is no general season fallback, and the entire program is built around a tightly controlled number of permits designed to protect a fragile, slow-to-recover species.

For hunters researching this unit, the numbers tell a clear story: this is not a volume destination. Harvest totals run in the single digits every year, and the entire hunter pool in any given season can be counted on one hand. That scarcity is precisely what makes the unit worth understanding in detail before hunters invest years of applications chasing a tag here.

Unit Overview

Unit 566A spans elevations from 2,515 to 6,130 feet, encompassing a mix of low-elevation canyon breaks and higher desert-mountain terrain typical of Oregon's bighorn country. Public land accounts for 73% of the unit's roughly 1.2 million acres, giving drawn hunters substantial access to huntable ground without needing to negotiate private land permission for the bulk of their hunt. There is no designated wilderness within the unit, which means access roads and vehicle-based scouting are generally more available here than in wilderness-heavy sheep country found elsewhere in the West — though the terrain itself remains steep, broken, and physically demanding regardless of road access.

This combination — high public land percentage, no wilderness restrictions, and classic bighorn habitat of rimrock, canyon breaks, and sparse high desert vegetation — creates a unit where a drawn hunter can genuinely execute a DIY hunt if they're willing to put in the scouting time.

HuntPilot Analysis: Is Unit 566A Worth Applying For?

The honest answer depends entirely on what a hunter is looking for. If the question is "can I draw this easily," the answer is no — this is a limited-quota hunt in every sense, and the entire framework here is built around extremely low tag numbers. Recent harvest data compiled through HuntPilot shows just one or two hunters afield in any given season: two hunters in 2025, two in 2024, one in 2023, one in 2022, and one hunter recorded in 2021. This is about as small a hunter pool as it gets in western big game hunting, and it reflects a permit allocation that is almost certainly limited to a small handful of tags per year.

What stands out immediately is the success rate. Across the last four years with complete harvest data, every single hunter who drew a tag in this unit connected — 100% success in 2025, 100% in 2024, 100% in 2023, and 100% in 2022. A perfect harvest record across multiple years is a strong signal that hunters drawing this tag are experienced, well-scouted, and hunting a healthy, huntable ram population. It also suggests that the terrain, while demanding, doesn't create the kind of access barriers that leave rams unreachable once located.

Trophy potential adds another layer to the case for applying. The counties overlapping this unit carry a moderate history of trophy-class ram production, meaning there is a real trophy record here, even if it isn't among the most decorated bighorn country in the region. That places Unit 566A in a middle tier — not a unit with a thin or absent trophy history, but also not one of the handful of units producing headline-caliber rams every season. Hunters drawing here should expect a legitimate, mature ram opportunity rather than a guaranteed record-book animal.

Given the combination of a small, consistent harvest record, strong recent success rates, majority public land access, and a credible trophy history, Unit 566A is worth applying for — but hunters need to go in with realistic expectations about the draw itself. This is a long-term investment for most nonresidents and even many residents, and the unit rewards patience rather than a quick-draw strategy. For hunters who eventually do draw, the data suggests they're stepping into a hunt with excellent odds of success once tag in hand.

Harvest Success Rates

The harvest record for Unit 566A is remarkably consistent. Over the past four years of complete data, every hunter who drew a tag harvested a ram:

• 2025: 2 hunters, 2 harvested (100% success)
• 2024: 2 hunters, 2 harvested (100% success)
• 2023: 1 hunter, 1 harvested (100% success)
• 2022: 1 hunter, 1 harvested (100% success)
• 2021: 1 hunter recorded

A 100% success rate across multiple consecutive years with a small sample size should be read carefully — with only one or two hunters afield per season, a single missed opportunity would swing the percentage dramatically. That said, the consistency across four straight years of complete harvest is meaningful. It suggests hunters drawing this tag are typically well-prepared, that the ram population is visible and accessible enough to locate consistently, and that the terrain — while rugged — doesn't present the kind of access barriers that leave legal rams permanently out of reach. Hunters who invest years into drawing a tag here can reasonably expect that, once drawn, the odds of filling the tag are favorable, assuming they put in the scouting effort the terrain demands.

Trophy Quality

Bighorn sheep hunting is fundamentally a quality-over-quantity pursuit, and Unit 566A fits that mold. The counties overlapping this unit carry a moderate trophy history — real, documented production of trophy-class rams over time, but not at the elite level seen in the most storied bighorn country in the region. Hunters should interpret this as strong evidence that mature, legal rams are present and being taken with some regularity, without the guarantee of drawing a unit known for producing exceptional, top-tier record-book rams every season.

This moderate trophy designation, paired with the unit's perfect recent harvest success, paints a realistic picture: hunters drawing here have a good chance of taking a mature ram, and the possibility of a genuinely exceptional trophy exists, but it shouldn't be the primary reason to apply. The primary reason to apply is the opportunity itself — a bighorn sheep tag of any kind is one of the rarest permits in western hunting, and a unit with a track record of converting tags into harvested rams is a strong bet regardless of final score.

Access & Terrain

Unit 566A offers a genuinely favorable access profile for a bighorn unit. With 73% public land across the unit's roughly 1.2 million acres, drawn hunters have the ability to scout and hunt extensively without needing to secure private land access for the majority of the unit. This is a meaningful advantage over sheep units where public access is fragmented or where the best ram habitat sits on private ground.

Elevation in the unit ranges from 2,515 feet up to 6,130 feet, placing it in classic high-desert and canyon-break bighorn habitat rather than high alpine terrain. Hunters should expect a mix of open rimrock, broken canyon country, and sparse vegetation typical of California bighorn range in this part of Oregon. The lack of designated wilderness (0%) within the unit means motorized access roads penetrate closer to huntable terrain than in wilderness-restricted units, which can meaningfully reduce the physical toll of scouting and packing out compared to units where all access is foot or stock travel.

That said, "road-accessible" doesn't mean easy. Bighorn habitat by nature concentrates on steep, broken ground, and hunters should expect demanding physical terrain even where roads bring them within striking distance. Rams in this kind of country tend to bed and feed on faces and rims that require careful glassing and a willingness to work the edges of accessible ground on foot. Hunters who draw this tag should plan on spending meaningful time scouting before the season to pattern a specific ram, a strategy that consistently pays off in bighorn hunting generally and appears to be reflected in this unit's strong recent success rates.

How to Apply

Every bighorn sheep hunt in Unit 566A is a limited-quota, draw-only permit — there is no general season option for this species in this unit. Hunters must apply through Oregon's controlled hunt draw system, and because bighorn sheep tags are among the most heavily restricted big game permits issued by any western state, demand for the small number of tags available in this unit is heavily contested every year.

Oregon's system distinguishes between resident and nonresident applicants, and hunters should understand upfront that this is a long-term application strategy for almost everyone, particularly nonresidents. Some hunters accumulate points over many years before ever drawing a tag, while a small number may draw with limited application history depending on the specific draw mechanics in place for a given year. Because tag numbers for bighorn sheep are so small — this unit's harvest data shows a hunter pool of one to two people per season — competition for each available permit is intense regardless of residency status.

Given how few tags are issued and how much year-to-year variability exists in application strategy, hunters should not rely on generalized draw odds from other species or other states. Application dates, fees, and current draw statistics change from cycle to cycle, and hunters should consult HuntPilot's Oregon state page for the most current deadlines, fees, and draw data before applying. HuntPilot compiles this unit-level harvest and draw information to help hunters make an informed decision before committing to a multi-year application strategy for a tag this competitive.

Frequently Asked Questions

Is Unit 566A worth applying for as a bighorn sheep hunter? Yes, based on the available data. The unit has produced a 100% harvest success rate across the last four years of complete data, has majority public land access at 73%, and carries a moderate trophy history in the surrounding counties. The tradeoff is that tags are extremely scarce, and hunters should expect this to be a long-term application project rather than a short-term draw.

What is harvest success like in Oregon Unit 566A? Harvest success has been perfect in recent years — 100% in 2025, 2024, 2023, and 2022, with one to two hunters afield each season. This small sample size means the percentage should be read cautiously, but the consistency across four straight years suggests hunters who draw here are converting tags into harvested rams at a high rate.

How big are the bighorn sheep in Unit 566A? The counties overlapping this unit carry a moderate trophy history, indicating that mature, legal rams — including some trophy-class animals — have come from this area, though it is not among the region's top-tier trophy producers. Hunters should expect a legitimate, mature ram opportunity rather than a guaranteed record-book animal.

What is the terrain like in Unit 566A? The unit features classic high-desert and canyon-break bighorn habitat, with elevations ranging from 2,515 to 6,130 feet. There is no designated wilderness in the unit, meaning access roads reach closer to huntable terrain than in wilderness-restricted sheep units, though the ground itself remains steep and rugged once hunters leave the road.

How much public land is available in Unit 566A? Public land makes up 73% of the unit's approximately 1.2 million acres, giving drawn hunters substantial room to scout and hunt without needing private land access for the majority of the unit.

Where can I find current draw odds for Unit 566A? Draw odds, tag numbers, and application fees change every cycle. Hunters should check HuntPilot's Oregon unit page for Unit 566A for the most current draw statistics before applying.