Don't worry, there will be plenty of crazy folks out there packing those trails, mud bogs, swamps, etc....so the cold can get to the stuff down below to firm em up!
Can't ride on the "cold weather" or the "dirt" (for most of us at least).....
Either have a slow start that lets the frost set in before the snow arrives so the base will last longer & possibly prolong the season.....or have an early start with snow and little frost that might end the season faster due to the lack of base, or it just might keep snowing right into April.