if your looking for snow in Nov and April, you might want to check out the states in the Mountains

I know there was a few riders in Oregon/Washington that were riding late in the season due to their elevation. and lord knows that Alaska probably has snow when you want to go.
the last weekend that i rode in da UP we still had a good amount of snow, but it was dieing fast. and that was late March. the UP usually gets enough snow to ride in early Dec. however trails open Dec 1st too.