Utah is not a hard admit - but his GPA is low…test score is ok. So it’s not a safety by any means. Westminster is another school in SLC.
Colorado isn’t that close to “good” skiing - and it’ll be harder. Colorado State will be an easier admit. Boulder isn’t too far from Eldora. Fort Collins is farther. Fort Lewis College includes a pass to Purgatory - about half hour away.
Montana State is a yes. You might look at Nevada (in Reno) - not far from Mt. Rose and Lake Tahoe resorts, and Northern Arizona in Flagstaff. Even U of Arizona is only an hour from skiing (Mt. Lemon). These would all be admits.
Western Washington might be one to look at - gorgeous area and not too far from Mt. Baker although it’s not large. I think it gets more snow or as much as any other resorts.
Good luck.