The pass was discovered in 1769 by Gaspar de Portolà. It was initially named for General John C. Frémont, who was thought to have passed through it in 1847 on his way to sign the Treaty of Cahuenga, but he actually went slightly east of the pass on the El Camino Viejo.[1] The steep pass was made easier for stagecoach traffic with a deep cut made by Phineas Banning in 1854 as part of a road he built to provide service to Fort Tejon.
Beale's Cut remains, though partly collapsed. Sometime in the late 20th century it suffered a partial collapse, and now is about deep. It is visible from the Sierra Highway about one mile north from the intersection of The Old Road and Sierra Highway, just after the first bridge under SR 14. It lies between Sierra Highway and the new freeway, about a quarter mile to the northeast of a stone marker.
Newhall Pass is named after businessman Henry Newhall, whose land holdings formed the basis of the city of Santa Clarita.