Fire-Safe Landscaping in San Diego: Defensible Space Basics

Quick answer

Fire-safe landscaping in San Diego means managing the 100 feet around your home in zones. The City of San Diego describes Zone 0 (0 to 5 feet) as a mostly noncombustible area, Zone 1 (5 to 30 feet) as low, well-watered, fire-resistant plants, and Zone 2 (30 to 100 feet) as thinned and pruned native vegetation. Rules apply in very high fire hazard areas; check your city and fire department.

Last updated October 22, 2026

Wildfire is part of life in San Diego County. Neighborhoods are woven around canyons, chaparral and coastal sage scrub, and dry Santa Ana winds in fall can push fire and embers far ahead of a fire front. Much of the damage to homes in wildfires comes from embers landing on or near the house and igniting what's there. How you landscape the area around your home can make a real difference. This guide covers the basics, with a focus on the City of San Diego's current brush management rules. Other cities and fire districts in the county have similar programs, but details vary.

Are you in a fire hazard area?

State and local fire agencies map Fire Hazard Severity Zones. In the City of San Diego, the city says brush management is required by law for homes in Very High Fire Severity Zones. Many homes on canyon rims, in hillside neighborhoods and on the edges of cities like Poway, Escondido, El Cajon and Chula Vista are in or near these areas. Your city's fire department or planning department can tell you whether your property is mapped and what rules apply.

The three zones

The City of San Diego describes brush management as covering the 100 feet around a structure, divided into three zones.

Zone 0: 0 to 5 feet from structures

This is the ember-resistant zone right against the house. The city's guidance includes:

Removing dead plants, dry leaves, pine needles, mulch, firewood and other flammable debris, including on roofs, in gutters, on decks and under the home.
Using hardscape such as concrete, gravel, pavers or bare soil.
Keeping trees only if pruned so healthy branches stay at least 5 feet from roofs and walls, with the mature canopy at least 10 feet from structures.
Limiting combustible furniture and planters on decks, and replacing combustible fencing, gates and arbors attached to the house with noncombustible materials.

According to the city, new structures in Very High Fire Severity Zones must meet Zone 0 requirements after February 28, 2026, and owners of existing homes should aim to comply by February 2027 under state law (AB 3074). Statewide Zone 0 rules have been developing, so confirm the current requirements with your fire department.

Zone 1: 5 to 30 feet

Remove dead and dying vegetation, weeds, leaves and needles.
Keep plants other than trees under 4 feet tall and fire resistant. The County of San Diego publishes a fire-resistant plant list.
Water and maintain the plants; well-hydrated plants are much harder to ignite.
Prune trees regularly and keep space between trees and other plants.

Zone 2: 30 to 100 feet

This zone is often native vegetation on a slope. The city's guidance calls for removing invasive plants and dead wood, thinning about half of the area, and pruning what remains, with limits on the size of plant groupings that stay. Structures, permanent irrigation and grading of native soil are not allowed in Zone 2. Thinning has to be repeated every year.

Timing and habitat rules

Brush clearing in San Diego isn't allowed whenever you like. In sensitive native habitats such as coastal sage scrub, coastal sage-chaparral and maritime succulent scrub, the city allows clearing from August 16 through January 31, and not from February 1 through August 15 without a city exception. For properties in or next to the city's protected open space network, a bird breeding season also applies, and a qualified biologist may need to survey for nests before work. Clearing on city-owned land needs city approval. A landscaping company working on canyon lots should know these rules; ask them directly.

Choosing plants for defensible space

No plant is fireproof. What matters most is how plants are spaced, watered and maintained. In general:

Favor plants with high moisture content and little dead material, kept low near the house.
Avoid plants that build up dry leaves, bark or twigs, and keep ornamental grasses and palms trimmed of dead fronds.
Space shrubs apart so fire can't move easily from plant to plant or up into trees.
Skip invasive plants. The California Invasive Plant Council lists pampasgrass, crimson fountain grass and giant reed among invasive grasses in Southern California; these spread into canyons and can add fuel.
Check the County of San Diego's fire-resistant plant list for ideas, and remember that irrigation and upkeep matter as much as the species.

Hardscape as a fire tool

Hardscape is one of the most useful parts of a fire-safe landscape. Paver or concrete patios, gravel walkways and stone walls create breaks between the house and plants. Replacing wood mulch with gravel within five feet of the house, swapping a wood fence section attached to the house for metal or masonry, and moving firewood away from walls are simple, high-impact changes. A hardscaping company can help plan Zone 0 changes.

Balancing fire, water and erosion

Fire safety, water savings and slope stability can pull in different directions. Removing too much vegetation on a slope can lead to erosion in winter storms, and Zone 2 rules limit irrigation and grading. Watering Zone 1 plants has to fit within your water agency's rules. A good plan keeps soil covered with low, healthy plants and uses drip irrigation where watering is allowed. If a slope is already eroding, see our drainage and erosion control page.

What drives the cost

Costs vary with the size and steepness of the area, how much vegetation must be removed and hauled away, whether hand crews are needed on steep canyon slopes, the amount of hardscape in Zone 0, irrigation changes in Zone 1, and whether biological surveys or permits are needed. Annual Zone 2 thinning is an ongoing cost to plan for. Get written estimates that spell out which zones are covered and how often work will be repeated.

Who to call

For City of San Diego brush rules and inspections, the city's Fire-Rescue Department and its Community Risk Reduction Division. The city also offers a paid home risk assessment.
Outside the city, your local fire department or fire protection district.
For plant questions, the UC Master Gardener Program of San Diego County.
For the work itself, a CSLB-licensed landscaping company with defensible space experience. Large tree work near power lines should go to qualified crews; contact SDG&E about trees touching lines.

Ready to make your yard more fire-safe? Related services: tree and shrub care and landscape design and installation.

Frequently asked questions

What is Zone 0 in San Diego?

Zone 0 is the area within five feet of a structure. The City of San Diego describes it as a mostly noncombustible area using hardscape such as concrete, gravel or pavers, free of dead plants, mulch, firewood and other flammable material. Confirm current requirements with your fire department.

When can I clear brush on my canyon lot?

In the City of San Diego, clearing in sensitive habitats such as coastal sage scrub is allowed from August 16 through January 31, not from February 1 through August 15 without a city exception. Properties near protected open space may also need a nesting bird survey.

Can I irrigate the slope below my house?

In Zone 2 (30 to 100 feet), the City of San Diego does not allow permanent irrigation, structures or grading of native soil. Zone 1 plants closer to the house should be watered and maintained within your water agency's rules.

Sources and further reading

Request help now