How late in the winter can one expect to be able to take snowboarding lessons around Flagstaff, AZ?

I live around Phoenix, AZ, and it's always been my dream to snowboard. I want to make sure to take one or more lessons this winter and to have a basic ability to snowboard before the winter's up. Flagstaff, AZ is a local place where one can snowboard nearby.

Realistically, is it safe to wait potentially until the end of March or April to do this? Is it safe even to wait until the end of February? There was at least one, reasonably established place up there that would probably be ideal for taking lessons, but they are slow on communicating with customers (email only basically), and they want reservations up-front. Other places in AZ will also be outside of the Phoenix metro.

Now, a lot of these sorts of places use artificial snow, but I was already turned down a couple of months ago by a place around Gatlinburg, TN, because a heat wave at that time was simply too much for it to work out, even given artificial snow. I'd definitely rush up to Flagstaff this weekend, but...I'm also very busy and have personal obligations that would have to get done in addition to this.

So that said - and because I have tried getting answers elsewhere, but haven't gotten anything conclusive - is it safe to wait to take snowboarding lessons around Flagstaff until potentially the end of March? What about the end of April? Or is it important to try to work these in by mid- or even late February, to be on the safe side?