Matt,
Down here in the S.E. portion of the State, winter ends much sooner than up there.
I'm going to start around the middle of April. Last Spring I took my bear around the third week of April, and the bears were already out. The advantage of starting sooner, is that it's the boars that are more likely to be out first. Probably the last to show up, are the sows with cubs. It should help with the number of bears that are rubbed, but I saw lot's of rubbed bear at that time. I've been told that lot's of bear emerge from the den already rubbed, so who knows? :?