Outdoor Lighting in Thornton, CO (2026)
2 verified outdoor lighting rules for Thornton, Colorado, sourced directly from the municipal code and official government pages.
Verified from official government sources
Dark Sky Rules
Thornton regulates outdoor lighting to reduce light pollution and glare. Fully shielded fixtures required for new installations. Lighting must be directed downward and not trespass onto neighboring properties.
Thornton Dark Sky & Outdoor Lighting Rules
Some RestrictionsLight Trespass
Thornton prohibits outdoor lighting that causes unreasonable glare or illumination on neighboring properties. Light trespass complaints are handled through code enforcement.
Thornton Light Trespass Regulations
Some RestrictionsLooking for Adams County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Thornton city rules.
Outdoor Lighting in Adams County →