Big Sky is a 2.5 hour drive from Helena and is the only place we ski and board. That's not only because of the terrain and lack of crowds, but because we have a place to stay in Big Sky and we get season passes there so any days spent at other ski areas cuts into our 'daily average cost' by not using our paid-for season passes.
Unfortunately I've not been to any of the other ski areas that Kinpa noted (which is bad, since we lived in Bozeman for a while and now live in Helena), but I can comment on the one aspect of Great Divide here in Helena since I hear lots of people talking about it. The best advice for there is "bring your rock board".
The base is still advertised as 40" deep, but most people tell me you have to watch for rocks, etc. year round, much less that late in the spring. We do get some snow storms through, but we also have a lot of 50 - 60 degree days by then (just had 4 days of 50+ temps and high winds that melted all the snow piles in town, but the mountains still have quite a bit of snow in them). That time of year, it will really be a timing issue. If a storm just came through, you'll be pretty good. If it's been in the 50s for a week, maybe not so much.
I wish I could comment on if Great Divide has fun carving terrain, but since I've not been there (and couldn't explain what type of terrain we want to most softbooters or skiers), I can't help there.
So, I guess my response if full of no useful information at all, really. :rolleyes: Sorry.