Defensible Space Zones 

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Three zones make up the recommended 300 feet of defensible space.  

Zone 1:  0-30 feet around your home 

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The goal is to reduce flammable materials near your house 

Zone 1:   0-30 feet of reduced fuel 

• Use fire-resistant plants and shrubs
• Use low-grow, drought-resistant grasses and keep mowed to 4 inches
• Remove Conifers, Junipers and Gamble Oak trees 
• No shrubs or small trees underneath taller trees
  
  

Zone 1A:   0-5' feet - Noncombustible Area 

• Create a noncombustible 5 feet border around your home
• Remove all pine needles, dead leaves and plants
• No flammable shrubs
• Replace flammable mulch with gravel or rock

Zone 2:  30-100' feet of reduced fuel 

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The goal is to reduce heat and movement of flame
approaching ​your home. 

• Firewood stored at least 30' feet away from home - even further if your home is on a slope
• Reduce heavy accumulations of slash (dead branches, twigs, pine needles, etc.). 
• Strategically remove flammable plants like Western Juniper, Cypress, Gambel or Scrub Oak, Pinyon Pines
• Prune limbs of trees at least 10 feet or 1/3 the height of the tree, whichever is less
• Trees should be spaced out at least 10 feet between each tree's outermost branches -even more if your home is on a steep slope. 
• No shrubs or small trees underneath taller trees.  

Zone 3:  100' - 300' feet of reduced fuel

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The goal is to reduce fire intensity 

• Fire intensity can be increased if your property has steep slopes and a dense forest.  If present, you should consult with a qualified wildfire and forestry professional.   

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Learn More in these helpful Videos  

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Guide for property owners to build effective defensible space 

Colorado State University Extension 
​Home Hardening & Defensible Space 

National Fire Protection Association -
Your Home Can Survive a Wildfire 

Important Steps You Can Take to Create Defensible Space. 

Eliminate Ladder Fuels 

A wildfire is easier if it remains on the ground.   When a surface fire ignites, small trees and shrubs under larger trees can create a ladder for fire to spread into the upper branches of a large tree.  Wildfires that are carried in tops of large trees are referred to as crown fires and are much harder to contain.    To help interrupt the spread of wildfire, eliminate small trees or shrubs that are located underneath larger trees.  

Maintain at Least 10' of Crown Spacing - more if your on a slope 

The crown of a tree is the widest area of a tree.      To help slow the spread of wildfire, it's critical to have enough spacing between trees to reduce the threat of crown fires.    Experts recommend a spacing of a minimum of 10' between the widest part of trees.   If you live on a slope,  the suggested spacing can be 20' or more.      

Use Fire-Resistant Landscaping 

Remember, any plant can burn under the right conditions.  One way to help reduce your wildfire risk is to use fire-resistant landscaping around your home.  

Look for plants with these characteristics:

• Able to store water in the leaves and stems
  
• Maintain high moisture content with limited watering
  
• Drought tolerant
  
• Low levels of volatile oils or resins
  
• Product limited dead materials
  
• Remove any dead portions of fire resistant plants.  

Defensible Space Brochure 

Colorado State Forestry
​Defensible Space Guidelines 

Download Now

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