Thornton, CO Noise Ordinances: Amplified Music & Outdoor Sound (2026)
Amplified music rules in Thornton, CO, also called sound permit, PA system, or live music ordinances, set decibel limits, time-of-day restrictions, and when permits are required.
Key Facts
- Permit hours
- 7:30 a.m. to 10:00 p.m. only
- Issuance time
- Within 5 business days by city clerk
- Revocation
- Automatic on probable cause, by police
- Chapter 42 licensees
- Excluded, covered by their own license
- Governing section
- City Code § 38-441(a)(3)b, (c)(10)
Summary
Thornton bars any loudspeaker, PA system, or device that transmits music, instructions, or announcements if the resulting noise is plainly audible across a residential property line. Operators in commercial zones or at city-sponsored events must first get a temporary sound-amplification permit from the city clerk, valid only 7:30 a.m. to 10:00 p.m.
b.The use or operation of any type of audio or video system, noisemaker or loudspeaker or public address system operated or used on public or private property for any purposes including, but not limited to, vending, advertising, announcements or notifications, or any device used for transmitting music or for giving instructions, talks or lectures to any assembly of persons which results in a noise which is plainly audible across the property line of any property used for residential purposes, unless otherwise permitted by subsection (c)(10) herein... A permit shall be issued within five business days by the city clerk on condition that the sound amplifying equipment or device will be operated only between the hours of 7:30 a.m. and 10:00 p.m., only on the dates specified and in compliance with the noise level standards contained in subsection (c), Table A, herein.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 65).
Full Breakdown
City Code § 38-441(a)(3)b makes it a noise violation to run any audio or video system, noisemaker, loudspeaker, or public address system on public or private property, including for vending, advertising, or transmitting music, whenever the sound is plainly audible across the property line of a residential parcel, unless a permit under subsection (c)(10) applies. That permit process requires the applicant to give the city clerk the operator's name, address and phone number, the sound truck's license number if applicable, a description of the equipment, verification that a certified noise-metering technician will monitor the event, the purpose, and the dates, times and locations of use.
on the dates specified and within Table A's decibel limits. City park events approved under the permit are exempt from Table A's numeric limits but must still avoid causing "unreasonable noise" as defined in subsection (a)(1). Businesses already required to hold an operational license under Chapter 42 cannot use this temporary permit; their amplified sound is instead regulated through their Chapter 42 license.
Violations & Fines
Sound plainly audible across a residential property line is prima facie evidence of a per-se violation under § 38-441(a)(2). If the city has probable cause that a permit holder broke the permit terms or any other Code provision, the Thornton police department automatically revokes the permit under § 38-441(c)(10)c. Non-vehicle noise violations bring an immediate summons and complaint, or a written notice to abate giving 24 hours to 5 days to comply under § 38-452(d).
Frequently Asked Questions
Can I play amplified music at a private event in Thornton without a permit?
How do I get a sound amplification permit in Thornton?
Does a Thornton sound permit exempt me from decibel limits?
Sources & Official References
Other rules in Thornton
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Amplified Music & Outdoor Sound in Nearby Cities
How other cities in Adams County handle amplified music & outdoor sound.