From their website:
All good things must come to an end, however. We'll be open Monday,
April 21, closed April 22 - 25, the reopen for Friday, April 25;
Saturday, April 26; and Sunday, April 27, and then the lifts will stop
spinning at Mount Snow for the season. We were the first ski area to
open in Vermont, and we’ll be last to close in central/southern
Vermont. Yes, the southernmost ski area in Vermont has lasted until
April 27, and we owe much of it to our new fleet of fan guns. And stay
tuned, cause we'll be installing more this summer.