How much snow has Keystone gotten this season and over the last few ski seasons? Keystone gets an average annual snowfall of 213" of snow per year and on average has 69 annual snowfall days. The current 10-year snowfall record is 17". Check out Keystone historical snowfall using the grid below with average Keystone snow stats that includes: Average Snowfall, Max Base Depth, Biggest Snowfall, Snowfall Days and Average Base Depth.