Jefferson County adopted its own Wildfire Resiliency Code and WUI Overlay District, effective July 1, 2026, for unincorporated Jeffco. The county's interactive map splits properties into Class 1 (lower hazard) and Class 2 (moderate-to-high, stricter rules). The rules mainly apply to new construction and building permits, with hardening and defensible-space requirements in WRC Chapters 4 and 5.

Applies to	Unincorporated Jefferson County properties inside the WUI Overlay District — check the county's interactive map (light/dark blue = Class 1, orange = Class 2). Class 2 carries more mitigation requirements. Applies mainly to new construction and building permits.
Inspections	The county publishes a list of Certified Wildfire Mitigation Specialists for defensible-space inspections, plus a Defensible Space Certification form used with siding permits.
Plant rules	The county's WRC FAQ addresses why plants are restricted within 5 feet of buildings and why arborvitae, junipers, and gambel oak are prohibited within 30 feet — the plant-by-plant details live in the WRC and FAQ.
County contact	Planning & Zoning, 303-271-8700 (appointments Mon–Thu).

Details to confirm with the county

We couldn't confirm the following from Jefferson County's official pages. Check these with the county before you rely on them:

• Grant/financial assistance specifics — the county FAQ raises the question; amounts and programs need a direct read.
• How incorporated towns within Jeffco are handling their own CWRC adoption.

Verified July 2026 · Source: Jefferson County — Wildfires / Wildfire Resiliency Code (WUI Overlay District)