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What the ember-resistant zone rules mean for this city, under its actual designation and its actual fire authority.
The local snapshot
Rancho Santa Margarita is confirmed Very High on the county's official 2025 source maps, and in 2024 it found out why in real time: the Airport Fire burned to the city's edge neighborhoods. RSM sits directly against the Trabuco Canyon corridor, and Zone Zero (Zone 0) compliance here is about the newest fire on this site's record, not an old one.
Fire record
In September 2024 the Airport Fire burned 23,526 acres and destroyed 160 structures across its footprint, reaching Trabuco Canyon and pressing against Rancho Santa Margarita's Robinson Ranch and Trabuco Highlands neighborhoods. For those streets, the ember-resistant first five feet is the most recent lesson in the county, not a hypothetical: embers arriving from the canyon corridor test fence lines and foundations before any flame front arrives.
Who enforces it
OCFA is the Authority Having Jurisdiction here. Statewide Zone 0 is Proposed — not in force. Existing defensible-space law still applies. OCFA Guideline C-05 is a new-construction fuel-modification plan-review rule, not a countywide existing-home Zone 0 ordinance. Deadlines pages carry local status labels, not a 2027 to 2028 statewide clock; your jurisdiction sets the specifics, and this page names yours. For the requirements themselves, start with the regulations guide, fences and gates, and landscaping.
Questions
It reached the city's edge: the 2024 Airport Fire pressed against the Robinson Ranch and Trabuco Highlands neighborhoods after burning through Trabuco Canyon, destroying 160 structures across its 23,526-acre footprint.
Yes. RSM is named on the official Very High source maps and adopted its updated 2025 FHSZ maps. Precise citywide acreage isn't published in our verified sources, so we describe the designation rather than invent a number.
The ember pathway items: noncombustible fencing and gates where they meet the structure, noncombustible ground cover in the first five feet, and ember-resistant vents. Those streets face the canyon corridor directly.
Submit your address and we will follow up about which local rules apply to your parcel, what your fire authority will look for, and what an inspection would document.
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