1 county-level rule, plus city-specific rules for 1 city in Boulder County, Colorado.
Verified from official government sources
Boulder County Parks & Open Space areas are open for daytime use only, between sunrise and sunset, except certain named trail corridors and connecting spurs that are open 24 hours. Vehicles may not be parked from sunset to sunrise, and being in a park after hours is a civil infraction
Boulder County Parks & Open Space Rules, Rule 17
Boulder County Parks & Open Space areas shall be open for daytime use only, between sunrise and sunset... These trail corridors and neighborhood connecting spurs shall be open 24 hours per day.
1 cities in Boulder County have their own curfew laws rules. Each link goes to that city's dedicated page with code citations.
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