Mount Fremont is a 7,214-foot peak in Mount Rainier National Park, at the southwest corner of the Sourdough Mountains near the Sunrise Historic District. Many visitors know it for the trail to the Mount Fremont Fire Lookout, though that route stops short of the true summit, which lies just north of Frozen Lake. The mountain was named for John C. Frémont, whose Oregon Territory expeditions helped stir American interest in the region and whose journals recorded Mount Rainier erupting in November 1843. Officially adopted in 1932, the name belongs to a mountain shaped by Pacific weather, heavy snowfall, seasonal road access, and runoff into the White River.