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: View your data put in use here! Learn how to get involved Upcoming events Nothing from February 1, 2023 to March 1, 2023. Powered by Simple Calendar Join our mailing list! Get news on project updates and other happenings at CSO. Sign me up! 28,521 Observations to date Our database is growing and improving, thanks to you 3,492 Observers Join us and help improve snow science! Be a citizen scientist with CSO! Learn how to measure snow and share your observations.