Theoretically. They have an agreement with the Forest Service with a firm close date. So they can't go around making last minute changes because they just got a foot of snow (last year, not this year). However, for some weird reason (Utah? Tahoe?), visitors were way off the January and February numbers in March. I think maybe people booking for March are watching the early season numbers before booking. Which makes total sense. I swore last year in Lech I'd never ever travel for skiing in March, it's too unpredictable. Anyway, by the 3rd week of March, it was approaching ghost town status. Part of that might be the snow. We had an abysmal year in terms of snowfall, even though what we got held up well because of so many really frigid days. So, they wouldn't have even wanted to stay open, bears or no bears. (It was in fact empty enough on Gray Wolf that I was actively looking for bears on it. Bears have even been IN TOWN for weeks.) Hellroaring Basin always closes April 1 because of grizzly dens near the creek area down low. But, people stop coming and I am sure that is the main reason no matter what they claim. They also say they need to give employees a "release date" and that they can't react due to that. And maybe that's also a factor because a lot of the long time local employees do construction in the summer as it's the natural seasonal shift. They will all be eager to go to their much higher-paying construction jobs. And the kids from South America will have airplane tickets already bought.
Whitefish Mountain Resort also has a huge summer business they need to prep for. Believe it or not, they actually have had to bulldoze snow out of the way some years to prep the mountain biking trails.
So "grizzlies"? One factor. It sounds cool. (Not saying there aren't any, hell, I know personally they are in the area. I just think that BUSINESS reasons are the bigger factor.)