SNOPArK passes are good from Nov 1st- 30th with the exception of California their passes run from Nov 1st-May30th april. Each state has their SNOPARK that is own season costs. Washington is considered the most high priced, and I also can’t find their real period times. Ca, Oregon & Idaho all almost exactly the same, and also have the added bonus of being accepted in each other’s state. In the event that you purchase the $25 California SNOPARK pass you can make use of it in Idaho and Oregon for no extra fee, and the other way around.