Named after the explorer John C. Fremont, who surveyed the area in 1843 for the US Army Corps of Engineers, the Fremont National Forest was established in 1908 under the management of the United States Forest Service.

Originally known as the Goose Lake Forest in 1906, the site features a total of 1,207,039 acres of land. 549,800 acres are full with old growth, and 113,800 of which are wooded areas filled with Lodgepole Pine. It also highlights the Chewaucan River.

In 2002, the Fremont National Forest was merged administratively with the Winema National Forest. This is why the site is now also known as the Fremont-WInema National Forests. Activities like boating, backpacking, mountain biking, skiing, camping, hiking, hunting, fishing, and horseback riding can be enjoyed in the site.