Last year it was March. It varies, partly based on when there’s snow on the ground at home. Being able to get an hour of XC or to climb the hill in Harriman State Park on a day when I’m otherwise stuck at home makes all the difference.
Ended up February by two days but was pretty equal last season.
Covered different regions each month. January was all at Massanutten while doing a multi-week program of Sunday morning lessons. February included the last Sunday at Massanutten, a week at Taos, and a few days at Telluride. March had unexpected powder days at Jiminy Peak and Tenney, plus a spring break week at Alta with my daughter and friends. I stayed for another week at Alta in April. Added a late, late season trip to Oregon and California in May.