California Defensible Space Requirements (Zones 0–2)

Most homes lost in California wildfires are not ignited by a wall of flame — they are ignited by embers landing in something flammable within a few feet of the structure. Zone 0 attacks that directly: the first 5 feet from your walls, decks, and attached structures should contain nothing that can catch an ember. The requirement is phasing in through state rulemaking, but fire districts and insurers in the foothills already treat it as the standard.

• Replace bark mulch and wood chips in the 0–5 foot strip with gravel, pavers, or bare soil.
• Remove shrubs planted against the house — junipers, Italian cypress, and dry ornamental grasses against siding are the classic ignition points.
• Move firewood stacks, lumber, and combustible storage at least 30 feet from the structure, or into an enclosed, ember-resistant space.
• Clear dead leaves and pine needles from the roof, gutters, and the corners where fences, decks, and walls trap litter.
• Keep tree limbs from overhanging the roof and maintain 10 feet of clearance from the chimney outlet.
• Check what is under the deck — stored items and dry weeds beneath a wooden deck put an ignition source directly under the house.
• Use noncombustible fencing for the last 5 feet where a fence attaches to the house; a burning wood fence is a fuse leading to the wall.

From 30 feet out to 100 (or the property line), the goal shifts from a clean landscape to interrupted fuel: a fire that enters Zone 2 should lose intensity, drop out of the canopy, and slow down before it ever reaches Zone 1. Native vegetation can stay — it just cannot be continuous, dead, or ladder-fueled.

• Cut annual grass and weeds to a maximum height of 4 inches. In Sacramento's climate that means before the June cure-out, when a wet spring's grass crop turns to standing tinder.
• Create horizontal spacing between shrubs and between tree canopies — roughly 10 feet between mature canopy edges on flat ground, increasing to 20 feet or more on moderate to steep slopes.
• Create vertical spacing: clearance between the top of shrubs and the lowest tree limbs of at least three times the shrub height, so ground fire cannot ladder into the crowns.
• Remove dead and dying trees, downed logs adjacent to structures, and heavy accumulations of branches and slash.
• Manage litter depth — fallen leaves and needles may remain up to about 3 inches deep, enough to protect soil without carrying a hot fire.
• Keep clearance around outbuildings, propane tanks, and burn piles inside Zone 2 just as you would around the house.

Defensible space is not a clear-cut. Healthy, maintained trees survive inspections fine — and mature native oaks are among the most fire-resistant trees on a foothill parcel. The work is subtraction and separation, not elimination.

• Keep: healthy blue oaks and interior live oaks with canopies limbed up and deadwood removed. Their high moisture content and open structure make maintained oaks a fire-safety asset, and county ordinances protect native oaks anyway — removal usually needs a permit.
• Keep: individual specimen trees near the house, provided limbs are 10 feet off the chimney, off the roof, and nothing ignitable sits beneath them.
• Remove or treat: gray pines and other conifers with dead limbs and heavy needle drop close to structures; dead or dying trees anywhere in the 100 feet; and brush fields of manzanita, coyote brush, and Scotch broom growing as continuous fuel.
• Remove: ladder fuels under every retained tree — this single job changes fire behavior more than most tree removals do.
• Chip or haul the slash. Cut brush stacked on the parcel is fuel you paid to concentrate; PRC 4291 compliance includes dealing with the debris, not just cutting it.

If you are starting from an overgrown foothill parcel, do the work in the order that reduces risk fastest rather than trying to do everything at once. Start at the house and work outward: clear the roof, gutters, and the 0–5 foot strip first, because ember ignition at the structure is the most likely way a home is lost. Then work Zone 1 — dead material out, limbs off the roof and chimney, ladder fuels under the near trees removed. Zone 2 comes next: mow the grass before it cures in early summer, then tackle brush separation and dead-tree removal, which can spread over a season or two. Big items — dead tree removal near structures, steep-slope brush, heavy oak limbing — are where a tree crew earns its keep; the mowing and gutter cleaning most homeowners handle themselves. 916 Trees does defensible space clearing across the Placer and El Dorado foothills, from single hazard trees to full-parcel Zone 1 and 2 work, and estimates are free and site-specific.