Defensible Space in Placer & Nevada County: A Homeowner’s Guide

What defensible space actually means

California Public Resources Code section 4291 requires 100 feet of defensible space around structures in these zones (or to the property line, whichever is closer). The goal is not a moonscape — it is to interrupt the path a fire takes to your house, both the flames moving along the ground and the embers landing on and around the building.

The state describes this as a series of zones working outward from the structure. Each zone has a different job, and the trees in each are treated differently.

• •Zone 0 (0–5 ft): the ember-resistant zone immediately around the structure — see the note below, this one is still proposed.
• •Zone 1 (5–30 ft): the "lean, clean and green" zone — remove dead plants, keep tree limbs at least 10 feet from other trees and from the chimney, clear needles and leaves.
• •Zone 2 (30–100 ft): the reduced-fuel zone — thin the canopy, cut ladder fuels that let a ground fire climb into the crowns, and keep grass short.

Zone 0: important, and not yet required

Zone 0 is the newest and, on paper, the strictest part — the first five feet around a structure, kept free of anything that catches embers: no woodpiles, no combustible bark mulch, no dead needles in the gutters or against the siding, and firewood moved well back from the house.

It is worth doing now because that five-foot band is where most homes ignite in a wildfire. But it is important to be accurate about its legal status: as of mid-2026, Zone 0 is still a proposed regulation, not an adopted one. The Board of Forestry and Fire Protection missed the December 31, 2025 rulemaking deadline set by the Governor’s executive order, paused work in early 2026, and the latest drafts emphasize education and outreach rather than penalties. Treat Zone 0 as strongly recommended and very likely coming — not as a current legal requirement.

Where tree work fits

Most of what makes a foothill property defensible is tree work, and it is the part homeowners are least equipped to do safely themselves. On the parcels we serve that usually means a few specific jobs.

• •Limbing up conifers so the lowest branches are well off the ground, breaking the ladder a grass fire would climb.
• •Thinning crowded, never-thinned pine stands so crowns do not touch — the same overcrowding that invites bark beetles.
• •Removing dead and beetle-killed trees, which are both a fire hazard and a falling hazard.
• •Clearing branches back from the chimney and from the roofline, and keeping the roof and gutters free of needle litter.
• •Opening up long private driveways so a fire engine can physically reach the house — access clearance is part of the standard, not an afterthought.

Defensible space and tree-removal permits

A common worry is that permit rules will stop you from doing required fire work. In practice the two are usually compatible, but they differ by jurisdiction, so it is worth knowing which county you are in.

In Placer County, the Woodland Conservation ordinance generally exempts developed single-family lots that cannot be subdivided, and its permit trigger targets larger clearing rather than routine defensible-space work. In unincorporated Nevada County, most private-property removal needs no permit unless the parcel is in a specific overlay zone — the notable exception being properties inside the Nevada City Sphere of Influence, which do require a permit. Incorporated cities like Rocklin and the Town of Loomis protect native oaks by ordinance regardless of fire zone. We check the specific parcel before removing anything protected, and defensible-space obligations apply either way.