No, leaving your car running unattended is illegal in Massachusetts under MGL c. 90, § 13, except under narrowly defined circumstances. Local ordinances and 2026 climate compliance initiatives further restrict idling near schools or in high-pollution zones. Violations risk fines up to $500, with repeat offenses escalating penalties under the Department of Environmental Protection’s enforcement protocols.
Key Regulations for Leaving Your Car Running Unattended in Massachusetts
- MGL c. 90, § 13 prohibits leaving a vehicle unattended while the engine is running, with exceptions for warming vehicles in extreme cold (below 32°F) for ≤5 minutes or during traffic conditions where the driver remains within 10 feet of the vehicle.
- DEP Idling Regulations (310 CMR 7.29) enforce a 5-minute idling limit for all vehicles, including commercial fleets, with stricter 3-minute limits near schools or childcare facilities as part of the 2026 Clean Air Act compliance framework.
- Local Ordinances in cities like Boston and Cambridge impose additional restrictions, such as banning idling in residential zones between 7 AM–7 PM, enforced by municipal parking authorities with fines up to $300.
Violations are typically enforced by municipal police or DEP inspectors, with penalties escalating for commercial vehicles or repeat offenses. Exemptions exist for emergency vehicles or mechanical repairs, but these require active supervision by the operator.