1 county-level rule, plus city-specific rules for 2 cities in Boulder County, Colorado.
Verified from official government sources
Colorado allows only state-permissible fireworks (cylindrical/cone fountains, sparklers, snakes, ground spinners) under CRS 12-28-101 et seq. - all aerial and explosive fireworks are illegal statewide. Boulder County is high wildfire risk, and the Sheriff or Board of County Commissioners frequently enacts Stage 1 or Stage 2 fire restrictions under Ordinance 2023-1 and CRS 30-15-401(n.5)(II), which ban ALL fireworks in the affected unincorporated areas. Violations are civil infractions punishable by fines up to $500.
2 cities in Boulder County have their own fire regulations rules. Each link goes to that city's dedicated page with code citations.
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Boulder County Ordinance Hub →