From Evanston, WY:

Take Highway 89 north to Highway 30
Head west on Highway 30 to U.S. Highway 89
Continue west on Highway 89 to Beaver Mountain Ski Area

Distance is approximately 81 miles

From Ogden:

Take I 84 north toward Brigham City
Exit to U.S. Highway 89/91 and proceed east past Brigham City
Continue on U.S. Highway 89 to Beaver Mountain Ski Area

Distance is about 79 miles