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What Are Defensible Space Zones Around Homes in Fire Risk Areas?

Last updated October 26, 2026

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The short answer

Zone 0: The Immediate 5 Feet

Zone 0 is the area within 5 feet of your home, measured from the exterior walls. This is the most critical zone because it directly touches your house. Remove all combustible materials here, including wood mulch, dead plants, leaves, and flammable patio furniture. Use noncombustible surfaces like gravel, stone, or concrete instead.

Keep this zone clear of anything that can catch fire from embers. Move firewood, lumber, and propane tanks at least 30 feet away. Trim tree branches that overhang the roof and remove any vegetation touching the siding. Regularly sweep the area to keep it clear of debris.

Zone 1: The 5 to 30 Foot Ring

Zone 1 covers the area from 5 to 30 feet from your home. The goal here is to create a landscape that does not easily carry fire to your house. Mow grass to a height of 4 inches or less, and remove dead plants, weeds, and fallen branches. Space trees and shrubs so they do not form a continuous fuel path.

For trees, prune lower branches to at least 6 feet above the ground. Keep trees separated by at least 10 feet between canopies, and remove any ladder fuels like tall grasses or small shrubs under trees. Use fire-resistant plants and keep irrigation in this zone to maintain moisture. This reduces the chance of flames climbing from ground level to the canopy.

Zone 2: The 30 to 100 Foot Buffer

Zone 2 extends from 30 to 100 feet from your home, or to your property line if that is closer. This zone slows the fire's approach and reduces its intensity. Remove dead trees and branches, and thin out dense vegetation. Keep grass short and clear out accumulated leaf litter and pine needles. This creates a buffer that gives the fire less fuel to consume.

You can keep larger trees here, but space them so their canopies do not touch. Aim for at least 12 feet between tree crowns, and remove any trees that lean toward your home. This zone also includes outbuildings and sheds, so treat those areas with the same care as your main house. Remove any stacked materials or flammable storage near these structures.

Why These Zones Matter

Defensible space works by interrupting the path of fire. Embers can travel over a mile ahead of the main flame, and they are the most common cause of home ignition. By clearing zones, you reduce the chance that embers find fuel near your house and start a spot fire. This layered approach gives you multiple lines of defense.

These zones also give firefighters room to work. A cleared area lets them position equipment and make a stand against the fire. Even in a mild coastal climate with wet winters and dry summers, fire risk can spike during dry spells, so keep zones maintained year-round. Dry vegetation can ignite quickly once the season turns.

Maintenance and Local Considerations

Maintaining defensible space is an ongoing task. Inspect your zones each spring and after any storm. Remove new growth, dead branches, and accumulated debris. Keep gutters clean, as dry leaves and needles can catch embers and ignite your roof. Regular upkeep prevents the zones from becoming overgrown.

If you live in Bellingham, check with local fire officials for any specific requirements or recommendations. They may have maps of high-risk areas or seasonal guidance. Your property's slope, surrounding vegetation, and building materials all affect how much clearance you need, so adjust accordingly. A steeper slope may require more clearance because fire moves faster uphill.

Key maintenance tasks include clearing leaves and needles from gutters and roofs, storing firewood at least 30 feet from your home, and keeping grass mowed to 4 inches or less in Zone 1. Prune tree branches to 6 feet above ground in Zone 1, use rock or gravel instead of mulch near the foundation, and dispose of trimmings and yard waste promptly.

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Frequently asked questions

Do I need to clear all trees within 100 feet of my home?

No, you do not need to remove all trees. Instead, thin them so canopies do not touch, and remove dead or diseased ones. Keep spacing between trees and prune lower branches. The goal is to reduce fuel continuity, not to create a bare landscape.

How often should I maintain my defensible space zones?

Inspect your zones at least twice a year, once in spring and once in late summer. After storms, check for fallen branches and debris. Mow grass regularly during the growing season and clear gutters frequently. Consistent upkeep keeps the zones effective.

What if my property is smaller than 100 feet deep?

If your property line is closer than 100 feet, extend Zone 2 to your property boundary. On smaller lots, focus extra effort on Zone 0 and Zone 1, since those are closest to your house. Work with neighbors to create a shared buffer if possible.

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