Southern Oregon’s Lake County Outback Named World’s Largest Dark Sky Sanctuary

A 2.5-million-acre area of southeastern Oregon was certified on 11 March 2024 as an International Dark Sky Sanctuary by DarkSky International, making it the world’s largest Dark Sky Sanctuary to date. The Sanctuary, which is approximately one-half the size of New Jersey and is located within an area commonly referred to as the Oregon Outback, has committed to protect its starry night skies for the benefit of visitors, residents, and wildlife.

A Dark Sky Sanctuary is a certification given by the DarkSky International to public or private land that has an exceptional or distinguished quality of starry nights and a nocturnal environment that is protected for its scientific, natural, or educational value, its cultural heritage, and/or public enjoyment. To qualify as a Dark Sky Sanctuary, the area must meet strict criteria for sky quality, commit to protecting the night sky through responsible lighting practices, and provide public outreach. These sanctuaries provide opportunities for stargazing, astrophotography, and other nighttime activities that benefit from minimal light pollution.

The Outback is located within the largest, contiguous, pristine dark sky zone in the lower 48 states, and this certification helps to protect a large portion of the designated zone. Within the Oregon Outback International Dark Sky Sanctuary (OOIDSS) are the unincorporated communities of Adel, Plush, Summer Lake, the Hart Mountain National Antelope Refuge, a portion of the Fremont-Winema National Forest, nearly 1.7 million acres of land managed by the U.S. Bureau of Land Management, the Oregon Department of Fish and Wildlife’s Summer Lake Wildlife Area, nearly 80,000 acres of state-owned rangeland, and the Oregon Outback Scenic Byway.

The intentions behind pursuing a large-scale sanctuary are to protect much of the unique, pristine, dark sky zone, to keep any additional dark sky recreation dispersed (as it is now), to allow a number of incorporated gateway communities to economically benefit from the same project, and to more effectively and efficiently manage a certification within a remote area.

The OOIDSS is situated in the northern extent of the Basin and Range Province of the Western United States. It’s sparsely populated, very remote, and primarily comprised of public lands. It’s a high desert area characterised by sage scrub and abrupt changes in topography that alternates between narrow faulted mountain chains and flat, arid valleys and basins. Within this unique geography of geological wonders is priority habitat for an array of wildlife, including American pronghorn, bighorn sheep, sage grouse, white-tailed jack rabbit, and migratory birds navigating the Pacific Flyway. The region is also culturally significant and is home to a 13,000-year-old human occupation site. Dispersed within the OOIDSS are hot springs, wild horses, private rangelands, ranches, and cattle.

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