by april 20th, the following resorts will be closed, and everything else will be open...
-Mt Rose
-Northstar
-Sierra At Tahoe
They close because their lease with the national forest service is contracted that they close the second or third sunday of April.
Theres enough snow for squaw, alpine, boreal, kwood, and heavenly to all be open with good snow and sick parks well into may.
Hope that helps man.