Only thing is, they are talking of opening June 24 - Sept 4 for summertime activities like sightseeing & food, (I don't think they will allow Mt Biking) NOT snow-fun.
Based on what they are offering, I'd guess Chinook & REX will be the only lifts running, not GV.
Here's thier web page deep-link:
FWIW, The rumor mill has this weekend as last day for lifts until June 24, but there's always a possibility of a spring season. Mayby.
FYI - White Pass is staying open till April 30th. So is Baker.