Difficulty Moderate - Some winding roads and elevation changes

Crystal Springs Skyline Loop

42 Miles
Scenic loop with forest, reservoir, and hilltop views
Hillsborough
Photo of route Crystal Springs Skyline Loop in Foster City, California, United States

Best time: Early morning or late afternoon for best lighting and less traffic

A picturesque drive through the hills west of San Mateo, offering breathtaking views of Crystal Springs Reservoir, redwood groves, and panoramic Bay Area vistas.

Start / End: Hillsborough

Driving tips: Watch for cyclists on Skyline Boulevard. Use lower gears on steep descents. Keep an eye out for wildlife crossings, especially at dawn or dusk.