Conejo Grade, Mountain pass on Highway 101 in Ventura County, US

Conejo Grade is a mountain pass along Interstate 101 in Ventura County that spans several kilometers with a steep grade. It connects the Conejo Valley with Camarillo and serves as a major route through Southern California's coastal region.

The route through the pass was already in use by 1929, when a re-alignment was completed. The State Highway Department improved the road in 1912, when it was six miles long with 49 curves; in 1935 it was straightened and relocated, becoming a mile shorter with only twelve curves. Caltrans brought the highway to freeway standards in the 1950s.

The name derives from the Spanish "cuesta del conejo", slope of the rabbit, a nod to the jackrabbits once common on Conejo Mountain. The Chumash had a trading trail through this pass, later used by farmers hauling hay, wheat and barley wagons to the Hueneme wharf. The route is designated part of the commemorative El Camino Real.

The grade is a 7% incline on US 101, so trucks slow sharply on the climb and descent. California Highway Patrol inspection stations for trucks sit on both sides of the highway at the upper terminus, elevation 841.1 feet (256.4 m). Expect closures during Santa Ana wind events, as in the Hill Fire of November 8, 2018.

The pass was originally so winding that drivers had to move slowly through all the curves. A massive redesign in the mid-20th century greatly reduced the number of tight turns and made the passage much more direct.