Snowpack

Snowpack data tells you how much snow is on the ground, how much water it holds, and how it's changing. Use it to time spring trips around melt-out, gauge ski-touring conditions, and anticipate runoff that feeds stream crossings.

• NOAA National Snow Analyses (NOHRSC) Web — daily national maps of snow depth, snow-water equivalent, and snow cover from the National Operational Hydrologic Remote Sensing Center. Good for a continental-scale view of current conditions.
• NRCS Snow & Climate Monitoring Reports Web — predefined SNOTEL and snow-course reports and maps by state, basin, and water-year comparison. Useful for seeing how this year stacks up against median and prior seasons.
• NRCS SNOTEL Interactive Map Web — click individual SNOTEL stations for real-time snow depth, SWE, precipitation, and temperature. Pick stations near your trailhead to get the closest available ground-truth before a trip.
• NSIDC Snow Today Web — daily Western-US snow analysis and monthly summaries from the National Snow and Ice Data Center. A research-grade complement to the federal operational sources above.