Idaho protected what most of America lost.

Darkness is not empty space. It is environmental, scientific, cultural, and economic infrastructure.

The Central Idaho Dark Sky Reserve was designated in December 2017 as the first International Dark Sky Reserve in the United States. It spans roughly 906,000 acres across some of Idaho’s most recognizable mountain communities and landscapes.

The night sky is not decoration. It is part of Idaho’s inheritance.

Why protected darkness matters

Artificial light changes more than the view. Responsible lighting supports wildlife, human sleep, scientific observation, energy efficiency, and the experience of place. A protected night sky also creates durable value for education and low-impact tourism.

What makes Central Idaho different

• Nationally significant protected night-sky territory.
• Gold Tier recognition for exceptional darkness.
• Access through communities including Stanley, Ketchum, and Sun Valley.
• A living setting for astronomy, observation, and public education.

Study the sky without claiming it

BAS approaches Idaho’s night with discipline: observation before performance, preservation before promotion, and respect for the land and communities that keep darkness visible.