Central Idaho Dark Sky Reserve, Dark sky preserve in Sawtooth National Recreation Area, US
The Central Idaho Dark Sky Reserve is a protected area within the Sawtooth National Recreation Area in Idaho, where artificial lighting is kept to a minimum across a wide landscape of mountains and river valleys. The reserve covers a large portion of central Idaho and includes both public lands and several small towns that follow strict lighting rules.
In 2017, the International Dark-Sky Association gave this area its gold-tier designation, making it the first reserve of that level in the United States. That recognition came after years of work by local communities and land managers to reduce light pollution across the region.
Towns like Ketchum and Stanley have adjusted their street lighting to protect the night sky, and this effort is visible in how quiet and dark the roads feel after sunset. Darkness here is treated as something worth caring for, not just an absence of light.
Highway 75 runs through the reserve and gives access to several open areas well suited for watching the sky at night. Planning your visit around a new moon makes a noticeable difference in how dark the sky gets.
On very dark nights, zodiacal light becomes visible here, a faint glow caused by sunlight scattering off interplanetary dust along the plane of the solar system. This is something most people have never seen because light pollution erases it almost everywhere else.
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