Rancho Santa Margarita, CA
Rancho Santa Margarita wildfire risk explained
USFS scores Rancho Santa Margarita at the 99th national percentile for wildfire risk to structures (in USFS's highest wildfire-risk band nationally), a figure built from 11,388 real buildings rather than raw vegetation cover. (Source: USFS's Wildfire Risk to Communities methodology.)
Separately from the risk score above, Rancho Santa Margarita's burn probability — fire likelihood with no building count factored in — sits at the 99th percentile nationally.
Rancho Santa Margarita's building exposure, zone by zone
95.3% of Rancho Santa Margarita's 11,388 buildings fall in USFS's Indirect exposure zone — ember cast rather than direct flame — against 4.7% Direct and 0% Minimal. Vent screens and roofing material matter more here than lot clearing alone. At 11,388 buildings, this is a substantial built environment, so the shares below describe a real population of structures, not a handful of edge cases.
Where Rancho Santa Margarita ranks
Rancho Santa Margarita scores 99th nationally and 92nd within California — close enough that its state context doesn't change the picture the national number already gives. Among the 31,521 US communities USFS scores, Rancho Santa Margarita ranks 218 for wildfire risk (1 is highest) and 1,387 by building count (1 is largest). Within California alone, it ranks 126 of 1,570 places by risk. See the full county-by-county picture for California on its state page.
Shopping for coverage in Rancho Santa Margarita
Because Rancho Santa Margarita 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.
What would actually reduce this score
Rancho Santa Margarita's 95.3% 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
Rancho Santa Margarita's 99th-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 Rancho Santa Margarita, see the exposure-zones guide.