Longmont, CO Short-Term Rentals: Noise Rules (2026)

Because the City of Longmont's STR program does not impose unique party-house or quiet-hour rules on STRs, all noise generated by STR guests is enforced through the citywide noise ordinance in Longmont Municipal Code Title 10 (Public Peace, Morals and Welfare), Chapter 10.20 (Offenses Against the Public Peace). The chapter prohibits unreasonable noise and uses two enforcement tests. The first is a time-of-day plain-audibility test: between 10:00 p.m. and 7:00 a.m. it is unlawful to make, cause to be made, or assist another to make noise that is audible at a distance of at least 25 feet from the noise source, unless the sound-pressure level remains entirely within the confines of private property which the noise-maker has the right to occupy. The second is a decibel test: noise is measured under the 'A'-weighted sound pressure level using a sound level meter with the 'A' weighting network, against zone-specific maximum sound-pressure limits. Special-event use of public places permits authorize amplified sound up to 80 decibels measured from the permit-area perimeter. Operators of licensed STRs are expected to incorporate quiet-hours and occupancy expectations into their guest house rules; while the city does not require posted quiet-hours signage as part of the STR license, repeated noise complaints associated with a licensed STR address can be reported to Code Enforcement (303-651-8695) and considered when the city evaluates the annual license renewal. Active noise disturbances are handled by Longmont Public Safety (Police), and pattern complaints may be referred to Code Enforcement.