2 county-level rules, plus city-specific rules for 2 cities in Larimer County, Colorado.
Verified from official government sources
Unincorporated Larimer County has no countywide dark-sky ordinance, but mountain-gateway Estes Park applies exterior-lighting standards under Section 7.9 of its Development Code, including for new development and vacation rentals, to protect the night sky near Rocky Mountain National Park.
Estes Park Development Code (exterior lighting per §7.9)
Vacation homes and bed and breakfast inns, whether new or existing structures, shall be subject to the exterior lighting requirements for new development as described in Section 7.9 of the Estes Park Development Code.
Unincorporated Larimer County has no numeric light-trespass ordinance for existing single-family homes; disputes are handled as nuisances. Fort Collins regulates exterior site lighting and off-site spill under Land Use Code §3.2.4, and Estes Park under Development Code §7.9.
2 cities in Larimer County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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