CSO is a citizen science campaign to measure snow.

Make your backcountry travels count! We need your help measuring snow depths in mountain places too vast for researchers to monitor.

Your observations help us predict snow conditions and improve safety for mountain travelers.

Upcoming events

May 1, 2021
  • Photo contest May 1-15

    May 1, 2021 - May 15, 2021  

    End-of-season photo contest!
    When: May 1-15
    Where: Instagram
    How: Select a photo that presents your favorite moment on snow this year, use hashtag #communitysnowobs and tag two (2) friends (Ps. They don't need to be physically present in the photo).
    CSO's science and ambassador team will vote on the top 3 photos and the lucky winners will receive a backpack from Backcountry Access!

Join our mailing list!

Get news on project updates and other happenings at CSO.

Observations to date

Our database is growing and improving, thanks to you


Join us and help improve snow science!