Colorado Idling Restrictions

Idle Reduction Requirement - Denver

Idling of any vehicle for more than five minutes in any one-hour period is prohibited within the city and county of Denver. Exemptions apply for the following: when ambient outside air temperatures have been less than 20 degrees Fahrenheit for the previous 24 hours; current ambient outside air temperature are less than 10 degrees Fahrenheit. This requirement does not apply to emergency vehicles, vehicles engaged in traffic operations, vehicles being serviced, vehicles that must idle to operate auxiliary equipment, and vehicles that are idle due to traffic congestion. (Reference Revised Municipal Code, City and County of Denver, Section 4-43)

Idle Reduction Requirement - Aspen

Idling of any vehicle for more than five minutes within any one-hour period is prohibited in the City of Aspen. Exemptions apply for safety reasons and to maintain specified engine temperatures. Violators are subject to a penalty of up to $1,000 and/or one year imprisonment. (Reference City of Aspen Municipal Code 13.08.110)

Idle Reduction Requirement - Arapahoe County

The Arapahoe County Engine Idling Policy applies to all local government vehicles and requires that drivers do not allow any engine to idle for more than one minute (or 30 seconds for off-road equipment) at any time or for more than five minutes in any one-hour period. This requirement does not apply to vehicles for which idling is necessary, including official traffic control devices or signals, traffic or other required stops, safety or health, engine testing, or at the direction of law enforcement personnel. (Reference Arapahoe County Resolution 090-502, 2009)