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.

Here's how to get involved

Upcoming events

April 15, 2021

  • April Fools' Fling Data Collection Contest: April 1-15

    April 15, 2021

    When: April 1-15, 2021

    Where: Undisturbed snow in the backcountry

    How: Submit individual measurements >100 m apart in Mountain Hub

    More Details here.

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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 citizen scientist with CSO! Learn how to measure snow and share your observations.