Defensible space clearing: what to cut, what to keep, and what passes.

What "clearing" actually means

The biggest misconception about defensible space clearing is that it means scraping the lot down to bare dirt. It does not. Bare dirt erodes, sheds water, and is not what CAL FIRE asks for. Clearing is fuel reduction: you remove what is dead and dying, thin and space what is alive, and break up the continuous path fire would otherwise use to travel from the wildland to your walls.

Done right, a cleared property still has trees, shrubs, and a green yard — they are just healthy, watered, and spaced so that a fire on the ground can't climb into a tree, and a burning tree can't reach the next one or the house. This page is the how-to. For the law and the zone definitions behind it, start with the defensible space hub.

The defensible space clearing checklist

Work from the house outward. Each task below maps to something an inspector looks for, with the specific numbers CAL FIRE uses.

The first 5 feet (Zone 0)

• Remove all dead plants, leaves, and pine needles touching or near the house.
• Pull combustible bark mulch and wood chips away from the foundation; replace with gravel, stone, or other non-combustible ground cover.
• Move firewood, lumber, and propane tanks out of this zone (at least 30 feet from the house).
• Clear anything stored against the walls and under windows. For the full ember-zone standard, see the Zone 0 hub.

0–30 feet (Zone 1: "lean, clean & green")

• Remove dead grass, weeds, shrubs, and tree limbs throughout the zone.
• Clean dead leaves and needles off the roof and out of the gutters — one of the highest-payoff, lowest-cost tasks there is.
• Cut tree branches back at least 10 feet from the chimney and away from the roofline.
• Remove flammable vegetation and stored items from under decks, porches, and stairs.
• Relocate firewood piles out to Zone 2, and keep patio furniture, planters, and play structures away from the walls.

30–100 feet (Zone 2: "reduce fuel")

• Mow annual grasses to a maximum height of 4 inches.
• Remove the lowest tree branches so the canopy starts at least 6 feet off the ground — this cuts the "ladder fuel" that lets a grass fire climb into the trees.
• Space shrubs horizontally by at least 2× their height on flat ground, increasing to 4× on a 20–40% slope and 6× on a steeper slope — fire spreads faster uphill, so steeper land needs wider gaps.
• Keep 3× a shrub's height of vertical clearance between the top of the shrub and the lowest branch of the tree above it.
• You may leave fallen leaves, needles, and small twigs to a depth of about 3 inches for erosion control — anything deeper is fuel.

DIY or hire a crew?

Most defensible space clearing is genuinely DIY-able. The line worth drawing is about safety and equipment, not difficulty.

Do it yourself

• Cleaning the roof and gutters.
• Mowing and string-trimming dry grass and weeds.
• Raking and bagging leaves and needles.
• Pulling small dead shrubs and clearing under decks.
• Moving firewood and rearranging combustible items.

These are a weekend or two of work for a typical lot, and the only real cost is green-waste disposal. Many counties run free chipper days or curbside green-waste pickup during fire season — check with your local fire safe council.

Hire it out

• Tree limbing above head height and any work near power lines.
• Large or dead tree removal — a job for a licensed, insured tree service.
• Brush clearing on steep slopes, where footing plus a chainsaw is a real hazard.
• Heavy, overgrown lots where the volume of material makes hand tools impractical.

When you hire, look for a contractor who clears to CAL FIRE standards and hauls away the debris, and confirm they're licensed and carry liability insurance. If you'd rather have us match you with a vetted local crew, that's one of the paths in your contractor options.

What it costs

A DIY clearing pass costs little beyond your time, fuel, and disposal fees. Hiring a crew ranges from a few hundred dollars for a small, flat lot to several thousand for a large or steep parcel with heavy brush and tree work. The biggest cost drivers are lot size, slope, how overgrown the property is, and how much tree work is involved.

For a full pricing breakdown — per-task costs, regional variation, and financing options — see the defensible space cost guide.

When to clear: timing the work

Timing matters as much as the tasks. The goal is to have the property cleared before fire season and before inspections begin.

• Late winter to spring: do the heavy clearing — tree work, brush removal, big cuts — while vegetation is still green and easier to handle, and before nesting and burn-permit restrictions tighten.
• Late spring: mow grasses as they begin to dry and cure. CAL FIRE inspections typically run April through September, so be ready by late spring.
• Through summer and fall: maintain. Re-mow grass as it dries out, and keep roofs and gutters clear of falling needles and leaves right through the season.

What an inspector actually checks

A defensible space inspection is a walk-around against a consistent list. Before you consider the job done, check your own property the way an inspector will:

• No dead vegetation anywhere within the 100 feet.
• Annual grass mowed to 4 inches or less in Zone 2.
• Roof and gutters clean of leaves and needles.
• Tree branches 10 feet from the chimney and 6 feet off the ground.
• Trees and shrubs spaced (more on slopes).
• Firewood and combustibles moved away from the house.
• Clear space under decks, porches, and stairs.

For the different inspections you might face — CAL FIRE annual, local fire department, insurance aerial review, and the point-of-sale inspection — and how to prepare for each, see Defensible Space Inspection: What to Expect and How to Pass.

Whatever you clear, photograph it with dates and keep receipts. That record is what gets you through a re-inspection cleanly and what you show your insurer at renewal to protect your coverage.

Sources: California Public Resources Code §4291; CAL FIRE / Office of the State Fire Marshal defensible space guidance (readyforwildfire.org). Clearing standards are summarized here for homeowner planning — confirm specifics with your local fire agency, as some jurisdictions adopt stricter rules.