Replying to Summerski around the West coast

Hey guys,

me and my GF are planing to go to the States & Canada next Spring/Summer. (living in Switzerland)
We were wondering which skiresorts are open during April-June? (Westcoast)
I know about the most popular one‘s like Whistler, Hood, but don‘t really know any opening times.

Our plan is to fly to Canada(probably Vancouver) ski there for a bit & than make our way south towards oregon & probably till Denver before heading back towards LA. But its still a rough idea with plenty of changes to come😅😂

Maybe someone can help me or send me a helpful link?🤞