A roadside flare is believed to have started the June 14 fire along Southbound Highway 101 that endangered hillside homes and damaged structures.
Investigators are still trying to determine the exact cause of the grass fire, according to Larkspur Fire Chief Bob Sinnott.
Twin Cities Police evacuated several residences on Via La Cumbre and closed roadways to non-emergency traffic. Additionally, the California Highway Patrol shut down lanes along Southbound 101 so that fire crews could operate safely.
Units from San Rafael, Larkspur, Corte Madera, and Ross Valley Paramedic Authority assisted in controlling the fire. Approximately 2 acres of hillside was burned. Backyard fences, some decking and out structures were also damaged. A pool deck, wind screen and spa at 50 Via La Cumbre was damaged.