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What the ember-resistant zone rules mean for this unincorporated canyon community, under its actual designation and its actual fire authority.
The local snapshot
Silverado Canyon is the deepest of the Santa Ana Mountain communities, a single road in and out along Silverado Creek. Homes here sit directly against chaparral in a Local Responsibility Area mapped Very High, which is exactly the setting the ember-resistant zone rules were written for. In Silverado, Zone 0 (the official term is "Zone 0") isn't a distant policy question. It's the five feet between the wall and the brush.
Fire record
The Bond Fire ignited on Bond Way in Silverado on December 2, 2020, from a house fire that escaped into the canyon. It burned 6,686 acres, destroyed 31 structures, and pushed roughly 25,000 people out of the canyons. Thirteen years earlier, the 2007 Santiago Fire (28,445 acres, arson) burned through this same corridor. Two fires, one canyon, thirteen years apart: that repetition is why Silverado carries the county's most serious hazard designation and why the first five feet around every structure here matters most.
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
Yes. Silverado is an unincorporated community in OCFA's Local Responsibility Area mapped Very High, which triggers Zone Zero ember-resistant zone requirements.
It started here. A house fire on Bond Way escaped into the canyon in December 2020, burned 6,686 acres, destroyed 31 structures, and forced mass evacuations. Ember ignition at structures is the failure mode Zone 0 targets.
OCFA. As unincorporated county territory, Silverado falls directly under OCFA's hazard-reduction and defensible-space programs.
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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