For March I would look at Summit County Colorado. There you have
Breckenridge, Copper Mtn, Vail is 30 mins away, all are recognized as
among the top riding spots in the world. Plus, you also have A-Basin,
which has snow longer, Keystone, Loveland, all should be great in Mar,
which is the peak season there. I would probably target early Mar,
depending on the weather.