East Grade Rd - Palomar

East Grade Rd from Lake Henshaw to the Palomar Observatory is one of Southern California’s finest mountain rides. Stretching roughly 17 miles, this legendary asphalt ribbon ascends from the high-desert valley floor at around 2,700 ft to the pine-crested ridges of Palomar Mountain, topping out near 5,600 ft.

The ride begins along the wide, scenic shores of Lake Henshaw, (stop by the overlook) where the road quickly transitions into a technical, rhythmic ascent. Unlike its tight, frantic cousin to the west (South Grade Rd), East Grade is defined by steady, sweeping radiuses, immaculate sightlines, and dramatic, expansive views of the San Luis Rey River basin below.

As you climb, the chaparral-covered foothills give way to dense forests of oak, fir, and cedar, offering a refreshing alpine microclimate. The tarmac delivers a steady elevation climb and predictable, flowing corners that make it a favorite for driving enthusiasts and motorcyclists alike.

The route culminates at the iconic, gleaming white dome of the Palomar Observatory. Home to the historic 200-inch Hale Telescope, this world-renowned astronomical landmark provides a spectacular, rewarding finish to one of Southern California’s premier mountain passes.

Just get there with plenty of time to walk up to the observatory. They close the gates at 3:30.