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. But we also want to know the snow depth near urban areas - anytime, anywhere is our motto.

Your data help us model snow conditions in near real-time:

Upcoming events

March 10, 2023
March 15, 2023
  • Spring Snow Data Collection Contest

    March 15, 2023 - April 15, 2023  

    United States

    Days are longer, sun rays stronger!
    Enjoy some breaks in the outdoors and help us get a better understanding of this year's peak snow height and start of the ablation (snow melt) phase...! Join us for the last snow height data collection contest of the  winter with another batch of awesome prizes in the pot donated by Backcountry Access!  

    Where? United States
    When? March 15 - April 15
    How? Measure snowpack height and submit your observation in Snow Scope. Make sure observations are at least 100 m apart.

    See more details

    Add to your Google Calendar

March 31, 2023
  • Wild Corn

    March 31, 2023 - April 2, 2023  

    Ski in the corn season with Appalachian Mountain Club (AMC) and CSO at this classic backcountry event! Live music, party, SKIING, and awesome people.
    When? March 31 - April 2
    Where? King Pine, Madison, NH

    See more details

    Add to your Google Calendar

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Observations to date

Our database is growing and improving, thanks to you


Join us and help improve snow science!