Welcome to the Gallatin National Forest Avalanche Center (GNFAC) web site. This site is brought to you by the Friends of the GNFAC, a non-profit supporting avalanche awareness and education through a partnership with the GNFAC.

Based in Bozeman, Montana, the GNFAC covers an area of approximately 6,000 mi2, including the Bridger, Gallatin, and Madison Ranges, the Lionhead area near West Yellowstone, and the mountains around Cooke City.

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Today in the southern mountains, avalanches will remain easy to trigger or could run naturally. Carefully evaluate terrain and avoid traveling on or underneath large, steep slopes.
Near Bozeman and Big Sky, strong west-southwest wind drifted recent snow into wind slabs and large cornices that should be avoided. See today's advisory for more info at mtavalanche.com 🎥 J. Dobronyi #gnfacobsThe southern mountains picked up 4-6" of snow last night and more will fall today and tomorrow. Wind throughout the advisory area has been 20-30 mph with gusts to 50 mph out of the southwest. Eric and Alex were in the northern Bridger Range yesterday and found some slopes were stable while others were not. It is important to do your homework and dig before committing to steep terrain. See Eric's video here: http://ow.ly/Cf5I30gCuLd. View 24 hour snowfall totals and wind on our regional pages or weather log at mtavalanche.com #gnfacobsFresh wind slabs are unstable. Minimal wind over the weekend made small slabs that are mostly confined to ridgelines. More wind and snow in the forecast will build larger, unstable slabs. Otherwise, recent storms bonded well to the old snow, and stability is generally good. Warm temperatures this morning were starting to create pinwheels, indicating that loose snow avalanches could become easier to trigger through the day. #gnfacobsOur intern, Gabrielle, is conducting some snowfall research in Hyalite this season. If you spot PVC sticking out of the snow, try to stay out of the near vicinity, as it may cause settling. If you have any questions or happen to accidentally disturb one, go ahead and email us at mtavalanche.com


Dick Aspen hilariously stars in Get Avalanche Smart - Episode 2: Don't be like Dick. This is the second of four episodes promoting avalanche education by the Friends of the Avalanche Center.

The best $30 you’ll ever spend, guaranteed: Our Intro to Avalanches with Field Day. Two evenings of lectures plus a full day in the field digging pits and learning about rescue.

This is the first of 4 movies produced by the Friends of the Avalanche Center promoting Avalanche Education.

Introducing the GNFAC’s New Website!

New look. New feel.


Weather Stations

Weather Stations provide the GNFAC forecasters with information on snowfall, wind and temps from around the region. The Weather Log summarizes this daily.

Avalanche Education

GNFAC partners with groups around the region to provide evening avalanche classes, plus full day and multi-day courses, including some weekend field days. All our class offerings, along with courses from other providers, are on our Education Calendar.


Use this map to find the locations of unfamiliar places mentioned in the advisory. Also take a look at our glossary of avalanche terms.


Donate to the Friends of GNFAC; or order DVDs or 'Snow Sense' avalanche safety handbook.