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MT Dark Skies

Dark Sky Sites in Montana

Find the darkest skies in Montana for stargazing, astrophotography, and club events.

MT Nighttime Lights

2019 satellite image showing nighttime lights from the NOAA National Geophysical Data Center.

MT nighttime satellite image



MT Light Pollution

2015 light pollution map showing sky brightness at the zenith from World Atlas data. Colors correspond approximately to the Bortle scale (see sidebar). Gray areas are the darkest skies.

MT light pollution map



MT National Parks

Map showing names of national parks, forests, reserves, and other protected areas that often offer the darkest locations for stargazing.

MT parks map

Darkest Locations in MT

Depending on your gear and what you are looking at, there may be many locations that are dark enough. This table attempts to list the darkest sites possible in from a Bortle/SQM perspective.

      1. Dark site
      2. Bortle scale
      1. Flathead NF
      2. 1
      1. Glacier Peace Park
      2. 2
      1. Helena-Lewis and Clark NF
      2. 1
      1. Medicine Rocks
      2. 2
      1. North Cheyenne IR
      2. 1
      1. Upper Missouri Breaks
      2. 1
      1. Waterton-Glacier Peace Park
      2. 2