Pitkin County adopts Colorado Wildfire Resiliency Code as Section 11.35, effective 2 May 2026

Pitkin County, Colorado - a county-level jurisdiction in unincorporated western Colorado - formally adopted the 2025 Colorado Wildfire Resiliency Code (CWRC) on 25 March 2026, when the Board of County Commissioners (BOCC) voted to add Section 11.35 to Title 11 of the Pitkin County Code (Buildings and Construction).^[1] The amended code took effect on 2 May 2026 and applies to new building permits and land use applications filed on or after that date.

State mandate and adoption timeline

Colorado's Wildfire Resiliency Code Board adopted the CWRC on 1 July 2025 under 8 CCR 1507-39, established by Senate Bill 23-166. The state code set a minimum standard for all new construction and significant exterior alterations within the Wildland-Urban Interface (WUI), and required local jurisdictions with WUI-designated areas to adopt a conforming local code by 1 April 2026 and be in full compliance by 1 July 2026.

Pitkin County's BOCC adopted the CWRC and the State Wildfire Hazard Mapping on 25 March 2026, ahead of the state deadline. The ordinance was first read at a public hearing on 25 February 2026 and went through a second reading on 25 March 2026 before final approval. The 38-day gap between adoption and the 2 May 2026 effective date reflects the county's standard publication and notice period.

What the code covers - and what it does not

The 2025 CWRC is a minimum code, not a retrofit code. It applies to:

• New construction of structures and their surrounding defensible space
• Significant alterations, additions, or repairs that increase a structure's footprint by more than 500 sq ft, or that affect more than 25% of the exterior surface

The code does not apply to interior alterations, exterior painting or routine maintenance, fences located more than 8 ft from a habitable structure, or homes built to HUD Manufactured Home Construction and Safety Standards. Historic structures are exempt.

Unmapped properties in unincorporated Pitkin County default to the moderate fire-intensity tier under Section 303.3.3 of Title 11, Chapter 11.35. Projects on federal land within the county must also comply with the CWRC under Section 102.12 of the same chapter.

Pitkin County's local amendments

Pitkin County adopted the state model code with local amendments. The county's press release described the approach as a "focus on clarification, alignment, and targeted improvements rather than sweeping new requirements."^[1] The substantive changes include:

• Defensible space around driveways - new requirements consistent with Colorado State Forest Service guidance, intended to improve emergency-responder access and safety^[1]
• Steep-slope defensible space - updated guidance for properties on steep terrain, reflecting current best practices^[1]
• Expanded material options - broader choices for structure materials in moderate and severe wildfire hazard areas^[1]
• Tempered glass exemption - no requirement for tempered glass in high wildfire hazard areas, removing a potentially costly window upgrade obligation for development projects^[1]

The CWRC amendments touch both the Land Use Code (Title 8, Section 7-20-60, Chapter 7, Development Standards) and the Building Code (Title 11, Section 11.35). Wildfire regulations are organized across both titles; the controlling authority in any conflict is the adopted code, official maps, and adopted regulations, not this or any other summary.

Deputy Community Development Director Nicole Rebeck-Stout noted that the county's existing regulations were roughly 20 years old, and that the state model code provided an opportunity to update them "to the most current mitigation guidance for defensible space and structure hardening."^[1]

Who is affected

The code binds all development in unincorporated Pitkin County within WUI-designated areas. Trades directly affected include residential and commercial builders, site contractors responsible for defensible space layout, landscape architects specifying ignition-resistant planting (see Section 201 of Title 11, Chapter 11.35 for the definition of ignition-resistant vegetation), and window and glazing contractors working in high-hazard zones. The City of Aspen adopted conforming CWRC amendments at its own regular meeting the same week.

The BOCC's adoption packet from 25 March 2026 is the primary instrument; the county's CWRC FAQ guide (published 2 May 2026) provides supplementary guidance but is not the controlling authority. Determinations on applicability and compliance rest with the authority having jurisdiction - Pitkin County Community Development.