San Bernardino National Forest, National forest in Riverside and San Bernardino counties, United States

San Bernardino National Forest is a protected area spanning Riverside and San Bernardino counties, connecting desert lowlands with forested mountain ridges. The terrain rises through different elevations, creating varied natural settings depending on how far you travel into the mountain ranges.

The forest's recorded history includes its use as a filming location: Daniel Boone was shot here in 1936, and part of the 1969 musical Paint Your Wagon was filmed on its land. Its headquarters sit in the city of San Bernardino, with district offices in Lytle Creek, Idyllwild and Fawnskin. The Juan Bautista de Anza National Historic Trail crosses part of the forest.

The forest borders the Morongo Indian Reservation north of Cabazon and the Santa Rosa Indian Reservation near Toro Peak, and it holds caves and pictographs of historic importance to Native peoples. The Juan Bautista de Anza National Historic Trail crosses part of the forest.

Forest headquarters are in the city of San Bernardino, with district offices in Lytle Creek, Idyllwild and Fawnskin. The forest is split into a northern tract in the San Bernardino Mountains and a southern tract around the San Jacinto and Santa Rosa Mountains, so plan travel between them separately. Free camping is available at 47 Yellow Post sites across the forest. The Juan Bautista de Anza National Historic Trail crosses part of the forest.

The forest holds an estimated 87,400 acres of old growth, mostly Sierra Nevada mixed conifer, white fir, Jeffrey pine and lodgepole pine stands. It also contains Lost Lake, a sag pond formed by tectonic activity along the San Andreas Fault in the Cajon Pass area.