Zone 3: extended - Reduced Fuel Zone

The Extended Zone is the outermost defensible space, stretching from 30 ft or 15 m (50 ft or 20 m  if on a a slope)  to 100 feet from your home. It is the connection to the natural environment.

Its purpose is to reduce the overall fuel load in the landscape so that wildfires lose intensity before they can reach the Zones 1&2.

While this area can feel more natural and include trees, shrubs, and open vegetation, it must be carefully managed to prevent wildfire from spreading unchecked toward your home.

The problem

Dead vegetation and ground debris act as fuel.

The problem

Trees and shrubs too close together allow fire to spread.

The problem

Combustible structures and materials increase fire danger.

Do not

Action: Remove dead plants, underbrush, and small conifers that grow between larger trees

  • Keep the ground clear of dead and dry material. Dispose of heavy accumulations of litter such as fallen logs, branches, pine needles, and dry leaves.

  • Regularly inspect trees for dead branches and cut them away.

  • Prevent the buildup of slash piles or debris by hauling them off or chipping them.

Action: Thin and space out trees and shrubs so flames cannot jump from one to another

  • Prune or “lift” lower branches to reduce vertical fire spread.

  • Keep spacing between tree canopies

  • Maintain 6 ft clearance between the ground and the lowest tree branches

  • Avoid planting shrubs directly under tree canopies to remove “ladder fuels.”

Actions: No life and dry vegetation around structures

  • Surround sheds, outbuildings with non-combustible surfaces (like gravel or bare dirt) rather than plants.

  • Use metal or non-combustible fencing at property edges instead of wooden fencing

Do

“Aim for a natural but not overgrown look. Thin and space vegetation so fire can’t easily spread. Large trees can remain, but they must not touch, and lower branches should be cleared at least 6 ft above the ground. Clear away dead material and use fire-resistant plants wherever possible.” RIOS Architects

Best practice

Green and clean outer habitat

Best practice

NFPA Recommendation on tree spacing

  • From 60–100 ft out: keep at least 6 ft spacing between tree canopies.

  • From 30–60 ft out: keep 12 ft spacing between tree canopies.

Best practice