From 5 feet to 30 feet from the house – or to the property line, whichever is less:
Clear vegetation 10 feet from stationary propane tanks.
Keep lawns and native grasses mowed to a height of four inches or less.
Remove ladder fuels (vegetation under trees). Prune trees up to six feet from the ground. For trees shorter than 18 feet tall, trim above the ground to 1/3 of the overall tree height.
Space trees to have approximately 10 feet between crowns or approximately 40 trees per ½ acre.
Tree placement planned so the mature canopy is at least 10 feet from the edge of the structure.
Tree and shrubs in this zone should be limited to clusters breaking up the continuity of the vegetation across the landscape.
Photo Source: USAF FEMA
AZ Wildfire Information Links
SOUTHWEST COORDINATION CENTER
SW Wildland & Prescribed Fire Activity Map