Mt. Baldy is east of Highway 57 (Orange Freeway) and west of Interstate 15 (Ontario Freeway). From either freeway, use either I-210 (Foothill Freeway) or I-10 (San Bernardino Freeway).
Be aware that there is more than one Mountain Ave. exit off the 210. Make sure it is the Mountain Ave exit in the city of Upland and that it says Mount Baldy on the exit sign Take the Mountain Ave./Mount Baldy exit from either freeway, and head north towards the mountains. Mountain Ave. will turn into Mt Baldy Road and dead end at the ski area parking lot.