"Spring skiing" out west happens in May and June.
March and April bring full on powder days. Remember: elevation.
BWO's on the Green can start mid to late March and run into early May. Trying to hit/time both powder and dries is like multi tasking. You'll probably end up not doing either very well. But YOU might live a clean life and be rewarded.
Also key to remember that ski areas are on leased land from the BLM or Forest Service. MOST of those leases have the ski areas shut down by the second week in April. So check the resorts' closing dates.
My wife was in Crested Butte this week for an Avy refresher course. They did a lot of class work and when they did go outside it was to a ball field. Level 5
danger in the backcountry so no risks were taken. They learned how to dig snow caves, build litters with their skis, etc. Like she said, even if they got to dig a pit on a slope what was it going to tell them; it's too f^%***& unstable to go anywhere.
I'm driving to SLC next week to see come clients then skiing at Sundance for the first time on Thurs. Fri is still open for discussion. Ah, the riches we have out here.