Longmont, CO Noise Ordinances: Quiet Hours (2026)
Quiet hours in Longmont, CO, also called the noise ordinance, nighttime noise rules, or residential quiet time, define the hours during which excessive noise is prohibited.
Key Facts
- Quiet hours
- 10 p.m. to 7 a.m.
- Trigger distance
- Audible 25 feet from source
- Vehicle-noise trigger
- Audible 300 feet away
- Event exception
- 80 dB(A) or less, permitted event
Summary
Longmont presumes certain noise between 10 p.m. and 7 a.m. unreasonable and unlawful: audible engines, tools, repairs, or loud gatherings within 25 feet of a neighbor trigger a violation without further proof.
it is unlawful to intentionally, knowingly or recklessly make, permit or assist another to make unreasonable noise in a public place or near a private residence that a person has no right to occupy, which, under all of the circumstances presented, would cause a person of ordinary sensitivities significant annoyance and irritation. The following noises and circumstances shall be deemed as prima facie unreasonable in the context, however, of the above standards:
A.Amplified sound, as defined at section 13.37.020, audible 25 feet from the source of said sound or within a private residence that the person responsible for the sound has no right to occupy;B.Nonlicensed motor vehicle engines, nonvehicular engines and electric and pneumatic tools operated between 10:00 p.m. and 7:00 a.m. and audible 25 feet from the source of the sound
Full Breakdown
Longmont Municipal Code § 10.20.090 bars unreasonable noise citywide and lists conduct presumed unreasonable on its face: amplified sound audible 25 feet away, nonvehicular engines and power tools running between 10 p.m. and 7 a.m., vehicle repairs in that same window, and gatherings with loud, continuing activity lasting 15+ minutes overnight. Motor vehicle noise audible 300 feet away is also covered. Amplified sound of 80 dB(A) or less at a permitted special event, and routine city operations like mowing, are excluded. A companion section (10.20.100) separately sets numeric decibel ceilings that apply around the clock.
Violations & Fines
A listed nighttime noise is a municipal offense on its face; the city attorney can also pursue it as a public nuisance in civil court under § 10.20.110.
Frequently Asked Questions
Does Longmont have set quiet hours?
Do I need a neighbor to complain first?
Sources & Official References
Other rules in Longmont
How Longmont compares: Cities with the Strictest Noise Ordinances·Compare Longmont to another location·View the Colorado noise ordinances overview
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Quiet Hours in Nearby Cities
How other cities in Boulder County handle quiet hours.