CSO is a community 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:

View your data put in use here!
Learn how to get involved
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Upcoming events

Nothing from January 1, 2026 to February 1, 2026.

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Observations to date

Our database is growing and improving, thanks to you

Observers

Join us and help improve snow science!

Be a community scientist with CSO! Learn how to measure snow and share your observations.