“Front country flow with a canyon rock garden finish
— Jack Greenbaum
As of December 2017, this trail is closed as part of the Thomas Fire Closure. Violating this closure is a federal crime that can result in hefty fines or jail time.
This trail has two attitudes. At the top it is flowy singletrack through the chaparral. But once you get down into the canyon it is a rock garden like the nearby Romero Fire Road
You can ride San Ysidro as a loop by climbing up the Romero Fire Road
and transition to the trailhead across East Camino Ciello.
Hikers are frequently encountered on this trail and occasionally horses. Please ride with a bell.