San Lorenzo, CA
How exposed is San Lorenzo to wildfire?
Out of every US place USFS scores, San Lorenzo lands at the 37th percentile for wildfire risk to structures — close to the middle of USFS's national wildfire-risk range — a figure built from its 8,514 buildings, not the land around them. (Source: USFS's Wildfire Risk to Communities methodology.)
Separately from the risk score above, San Lorenzo's burn probability — fire likelihood with no building count factored in — sits at the 41st percentile nationally.
What "at risk" means for the buildings here
8,514 buildings are counted in San Lorenzo, and 85.5% of them are Indirect exposure — ember-driven risk rather than the 0.2% in Direct exposure or the 14.3% rated Minimal. At 8,514 buildings, this is a substantial built environment, so the shares below describe a real population of structures, not a handful of edge cases.
San Lorenzo against the rest of the country
San Lorenzo ranks lower within California (5th percentile statewide) than its 37th national percentile suggests alone — a calmer spot in a state where wildfire risk generally runs high. Among the 31,521 US communities USFS scores, San Lorenzo ranks 19,814 for wildfire risk (1 is highest) and 1,950 by building count (1 is largest). Within California alone, it ranks 1,495 of 1,570 places by risk. See the full county-by-county picture for California on its state page.
San Lorenzo and the insurance market
Because San Lorenzo is in California, a wildfire-hazard disclosure is legally required before a sale closes here — unusual nationally, since only these two states mandate it. The state's FAIR Plan alone carried 668,609 policies by the end of 2025. Full detail in the disclosure-law guide.
Lowering exposure, not just insuring around it
San Lorenzo's 85.5% Indirect-exposure share points at embers, not flame contact, as the main pathway — ember-resistant vents and non-combustible roofing rank ahead of defensible space here. Detail in the home-hardening guide.
More on how this number was built
San Lorenzo's 37th-percentile score and its burn-probability figure both come from the same USFS workbook, documented in the methodology guide. For more on what indirect exposure implies beyond San Lorenzo, see the exposure-zones guide.