I'm not sure spirit chief Skell would like people snowboarding on his mountain.
Thanks for the sites' references.
Now I just have to keep my fingers crossed...
I was kind of joking about Shasta as it is a big outing with out lifts. That said, I think the spirit chief is just fine with people skiing/riding Shasta. Hundreds of people do it each year, and there is a guide service. It is considered one of the grand classic summer descents in North America.
Arapahoe Basin in Colorado will be open until sometime in June. Generally the first week is when they close, mostly due to lack of business not snow. I think Snowbird in Utah will have some lifts spinning in June too. Utah got a good pounding of snow, so it's probably a good bet.