Climate change is expected to increase the frequency, intensity, and duration of wild-fire events impacting San Mateo County. Simulations of large wildfires using statistical models developed for the Fourth California State Climate Assessment show that the probability of a large fire—which burns more than 1,000 acres—in San Mateo County increases rapidly with a warming climate, with an eight-fold increase in the probability of a large wildfire by 2070. Local residents experienced evacuations, transportation disruptions, and heavy smoke as a result of the CZU, Cabrillo fire, and Edgewood fire, among others. With greater vulnerability due to fire damage, some of the burned areas have since been impacted by landslides. Even fires outside San Mateo County, such as the 2017 Napa and Sonoma-based Tubbs, Nuns, Atlas and Pocket fires, have led to significant local wildfire smoke impacts.