For wildfire-safer landscaping, keep the first five feet around your home low in combustible material, then separate shrubs and tree canopies so fire has fewer continuous paths toward the structure. CAL FIRE’s spacing guidance increases with slope: shrubs should be separated by two, four, or six times their height, while trees should be spaced 10, 20, or 30 feet apart. These are California recommendations, not universal rules; check your local fire department or fire protection district for requirements that apply to your property.
Start with the first five feet around the home
CAL FIRE calls the first five feet the most important area for reducing ember ignition. Treat it as a low-fuel, ember-resistant zone rather than a place for dense planting. The agency recommends hardscape such as gravel, pavers, or concrete and advises against combustible bark or mulch next to the structure. Remove dead or dying plants, leaves, and other debris, and limit combustible items on decks. CAL FIRE’s Defensible Space guidance describes these Zone 0 actions.
Space shrubs and trees according to slope
Plant spacing is intended to interrupt fuel continuity, not to provide a universal landscape-design formula. CAL FIRE’s recommendations use slope bands: steeper ground calls for greater separation. For shrubs, measure the gap between shrub edges; for trees, the California Board of Forestry guidance describes horizontal distance between tree canopies.
| Slope | Shrub spacing | Tree spacing |
|---|---|---|
| Below 20% | At least 2× shrub height between shrub edges | 10 feet between tree canopies |
| 20–40% | At least 4× shrub height between shrub edges | 20 feet between tree canopies |
| Above 40% | At least 6× shrub height between shrub edges | 30 feet between tree canopies |
For example, a five-foot shrub implies at least 10 feet between shrub edges on a slope below 20%, 20 feet on a 20–40% slope, and 30 feet above 40%. The figures are CAL FIRE recommendations; the agency page does not state a publication year. See the CAL FIRE spacing chart and the Board’s General Guidelines for Creating Defensible Space.
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Break up vertical fuel paths
Horizontal gaps between plants are only part of the plan. CAL FIRE recommends keeping tree branches at least six feet above the ground and leaving vertical space between shrubs and tree branches. The shrub-to-branch gap should be at least three times the shrub’s height: a five-foot shrub calls for 15 feet between its top and the lowest tree branches. These separations help reduce connected vegetation fuels; they do not make a property fireproof.
Maintain defensible space beyond the immediate zone
California’s guidance describes defensible space out to 100 feet from the home or to the property line, with local governments able to set stricter standards. CAL FIRE organizes maintenance by zone:
Zone 1: from the home toward 30 feet
- Remove dead plants, grass, weeds, leaves, and pine needles.
- Keep branches at least 10 feet from chimneys.
- Trim trees and separate vegetation from other items that could catch fire.
Zone 2: from 30 feet to 100 feet or the property line
- Mow annual grass to no more than four inches.
- Maintain horizontal and vertical separation among vegetation.
- Remove fallen debris.
For zone descriptions and regulatory updates, consult the California Board of Forestry and Fire Protection’s defensible-space zones page. The Board page says Zone 0 rulemaking is under final review, so distinguish agency recommendations from enforceable rules. Check your local fire authority for current requirements; local standards may be stricter than statewide guidance.
Choose plants and layout for the site, not just the spacing chart
Spacing recommendations address how vegetation can connect as fuel, but a chart cannot determine every property’s risk. California’s hazard mapping considers fire history, existing and potential fuel, predicted flame length, blowing embers, terrain, and typical fire weather. Review the CAL FIRE Office of the State Fire Marshal’s Fire Hazard Severity Zones information, and ask your local fire department or fire protection district how its rules apply to your slope, property line, and landscape.
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When planning a new landscape, avoid creating continuous bands of dense shrubs or low branches beneath trees. Preserve the recommended gaps, keep dead growth and debris from accumulating, and favor hardscape in the first five feet. For trimming, use a tool suited to the branch size; hand pruning shears are only for small growth, not large or overhead branches.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Pair landscaping with home hardening
Defensible space reduces vegetation fuels around a structure and can provide firefighters a safer area to work, but it is only one part of preparation. CAL FIRE recommends pairing it with home hardening, which addresses the home’s vulnerability to embers and fire exposure. Neither measure guarantees a home will survive a wildfire. See CAL FIRE’s Prepare guidance for the agency’s overview.
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