1 county-level rule, plus city-specific rules for 1 city in Jefferson County, Colorado.
Verified from official government sources
Jeffco Open Space parks are open one hour before sunrise to one hour after sunset. Entering or occupying Open Space Lands during closed hours (unless posted otherwise) is unlawful, with a $100 fine. Three urban parks - Crown Hill, Van Bibber, Welchester - keep extended 5 a.m.-11 p.m. hours.
Jefferson County Parks & Open Space Regulations C.21.a (Park Hours)
It shall be unlawful to enter, use or occupy Open Space Lands from one (1) hour after sunset to one (1) hour before sunrise, unless posted otherwise. Fine: $100.00
1 cities in Jefferson County have their own curfew laws rules. Each link goes to that city's dedicated page with code citations.
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