Fort Collins's Outdoor Lighting: The Rules That Matter
Every city handles outdoor lighting a little differently. In Fort Collins, Colorado, there are 2 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.
Dark Sky Rules
New development in Fort Collins had to cap outdoor light color at 3000 Kelvin, use anodized poles to cut glare, and skip mercury vapor lamps entirely under Section 3.2.4 of the Transitional Land Use Code. The rule applied to development applications filed before May 17, 2024, so verify a project's filing date before citing it as current.
Key details: CCT cap: 3000 Kelvin maximum. Prohibited fixtures: Mercury vapor lamps. Pole finish: Anodized or coated to cut glare. Lighting zones: LC0 (none) through LC3 (highest). Applies to: Applications filed before May 17, 2024.
Under Land Use Code Section 2.14.4(A), a violation of any Land Use Code standard, including the Section 3.2.4 lighting requirements, is a misdemeanor subject to City Code Section 1-15 penalties, with each day of noncompliance a separate offense; unclassified misdemeanor fines run up to $2,650. A development that installs mercury vapor lamps or exceeds the CCT cap risks denial of its certificate of occupancy until the lighting plan is brought into compliance.
Light Trespass & Shielding
Fort Collins capped how much light a development could throw across its own lot line, from zero footcandles into natural habitat buffers up to 0.8 footcandles in the densest downtown lighting zone. Section 3.2.4 of the Transitional Land Use Code set the numbers for applications filed before May 17, 2024.
Key details: Buffer zone cap: 0.0 footcandles at lot line. LC1 residential cap: 0.1 footcandles. LC2 commercial cap: 0.3 footcandles. LC3 downtown cap: 0.8 footcandles. Measurement spacing: Every 10 feet along lot lines.
A lighting plan that fails the Section 3.2.4(I) illuminance table is not approved, and installed lighting exceeding the cap after occupancy is a Land Use Code violation under Section 2.14.4(A), treated as a misdemeanor subject to City Code Section 1-15 penalties with each day of noncompliance a separate offense (fines up to $2,650 for an unclassified misdemeanor). The City can require retrofitting of noncompliant fixtures as a condition of any building permit or certificate of occupancy tied to the property.
The Bottom Line
Fort Collins's outdoor lighting rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Fort Collins is broadly strict or permissive.
Keep in mind that Fort Collins can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.