Outdoor Lighting in Denver, CO: What Residents Actually Need to Know
If you live in Denver or are thinking about moving there, outdoor lighting are one of those things you probably won't think about until they affect you directly. Denver has 2 specific rules on the books covering different aspects of outdoor lighting, and some of them might surprise you.
Dark Sky Rules
Denver's zoning code requires all outdoor light sources to be concealed in full cutoff fixtures that direct light downward, and bans mercury vapor, low-pressure sodium, and searchlight sources citywide to cut glare and light spill into the night sky.
Key details: Fixture type required: Full cutoff (shielded) fixtures. Banned light sources: Low-pressure sodium, mercury vapor, searchlights. Governing code: Denver Zoning Code Div. 10.7. Applies to: All new/substantially enlarged development. Enforced by: Denver Zoning Administrator.
The Denver Zoning Administrator reviews outdoor lighting plans during development and building permit approval; noncompliant fixtures or prohibited light sources must be corrected before a permit or certificate of occupancy is issued.
Light Trespass & Shielding
Denver's zoning code requires outdoor lighting fixtures to be mounted so the cone of light stays on-site and oriented to avoid glare onto adjacent Residential Zone Districts, with a 0.1 footcandle cap where parking lots abut Protected Districts.
Key details: Fixture mounting: Cone of light must stay on-site. Glare rule: Banned toward Residential Zone Districts. Protected District abutment: 0.1 footcandle max at line. Fixture type: Full cutoff/shielded required citywide.
Enforced as a zoning code violation by Denver Community Planning and Development. The Zoning Administrator can require fixture relocation, shielding, or replacement to bring a site into compliance, and unresolved noncompliance can lead to a zoning enforcement action and fines.
The Bottom Line
Denver'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 Denver is broadly strict or permissive.
This guide is based on Denver's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.