Alum Rock, CA
How exposed is Alum Rock to wildfire?
Alum Rock's 3,407 buildings earn a 79th-percentile wildfire-risk score nationally under USFS's model — well above the national norm for wildfire risk. (Source: USFS's Wildfire Risk to Communities methodology.)
Separately from the risk score above, Alum Rock's burn probability — fire likelihood with no building count factored in — sits at the 83rd percentile nationally.
Where Alum Rock's buildings actually sit
Most of Alum Rock's buildings (57%) sit in the Indirect zone, where wind-blown embers rather than flame front are the mechanism USFS is scoring — ember-resistant vents and non-combustible roofing are the interventions this pattern favors, more than defensible space alone.
How Alum Rock compares
Alum Rock ranks lower within California (38th percentile statewide) than its 79th national percentile suggests alone — a calmer spot in a state where wildfire risk generally runs high. Among the 31,521 US communities USFS scores, Alum Rock ranks 6,733 for wildfire risk (1 is highest) and 4,908 by building count (1 is largest). Within California alone, it ranks 972 of 1,570 places by risk. See the full county-by-county picture for California on its state page.
Shopping for coverage in Alum Rock
Alum Rock's 79th-percentile score lands in California, the only two states requiring a wildfire disclosure at sale. California's surplus-lines homeowners market passed 300,000 policies for the first time in 2025, driven by carriers pulling back from wildfire-exposed areas statewide. The disclosure-law guide covers what it requires.
Lowering exposure, not just insuring around it
Because 57% of Alum Rock's buildings sit in the Indirect zone, sealing the ember pathway (vents, roofing, gutters) is the intervention this page's data actually supports — see the home-hardening guide.
More on how this number was built
Alum Rock's 79th-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 Alum Rock, see the exposure-zones guide.