Noise Ordinances in Longmont, CO (2026)
8 verified noise ordinances for Longmont, Colorado, sourced directly from the municipal code and official government pages.
Verified from official government sources
Quiet Hours
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.
Longmont Nighttime Quiet Hours
Some RestrictionsLongmont Municipal Code § 10.20.090
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 ...
Construction Hours
Longmont bans construction activity noise in residential areas or within 500 feet of a school between 7 p.m. and 7 a.m. weekdays and Saturdays, and before 9 a.m. on Sundays, absent an approved exception.
Longmont Construction Noise Hours
Some RestrictionsLongmont Municipal Code § 10.20.100.D.4
"Construction activities. No activity incidental to the erection, demolition, assembling, altering, installing or equipping of buildings, structures, roads or appurtenances thereof, including land clearing, grading, excavating and filling shall occur between the hours of 7:00 p.m. and 7:00 a.m. Monday through Saturday or before 9:00 a.m. on Sundays, within a residential area or within 500 feet ...
Barking Dogs
Longmont declares an animal a public nuisance if its owner or keeper permits it to habitually bark, howl or make other noise that significantly disrupts the neighborhood's peace under a reasonable-person standard.
Longmont barking dog nuisance law
Some RestrictionsLongmont Municipal Code § 7.04.210
It is unlawful for any person owning, possessing or keeping custodial or supervisory authority or control over any animal, to permit such animal to habitually squeal, snort, grunt, bark, howl, yelp, squawk, screech, caterwaul, wail, crow or make any other animal sound in such manner as to significantly disrupt the peace and quiet of the neighborhood, or in such manner as to materially and persi...
Leaf Blower Rules
Homeowners' engine- or motor-powered lawn tools, including leaf blowers, power mowers, edgers and riding tractors, can't exceed Longmont's fixed noise standards outside 7 a.m. to 10 p.m. under Municipal Code § 10.20.100(D)(3); mufflers must stay in good repair, and snow blowers and snowplows are exempt from the hours.
Longmont Leaf Blower Hours Limit
Some RestrictionsLongmont Municipal Code § 10.20.100(D)(3)
D.Additional noise standards and exemptions for specific operations and activities...3.Homeowners' outdoor equipment.i.No person shall operate engine- or motor-powered lawn or maintenance tools intended for use in residential areas such as power mowers, leaf blowers, garden tools, riding tractors, power saws, edgers, and similar equipment that would create a noise that exceeds the fixed source ...
Amplified Music & Outdoor Sound
Longmont treats amplified sound audible 25 feet from its source, or inside a private residence, as unreasonable noise and a public nuisance under its general noise ordinance.
Longmont Amplified Sound Limit
Some RestrictionsLongmont Municipal Code § 10.20.090(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.
Aircraft Noise
Pilots using Longmont's Vance Brand Municipal Airport are directed to fly recommended traffic pattern altitudes designed to limit noise over nearby neighborhoods under Longmont Municipal Code § 13.39.040(K). Small aircraft fly at 1,000 feet AGL, larger and turbine aircraft at 1,500 feet, and helicopters, ultralights and gyrocopters at 500 feet, and § 13.39.040(K)(3) directs pilots to follow separately published noise-abatement traffic patterns when possible.
Longmont Airport Noise Abatement Patterns
Light RestrictionsLongmont Municipal Code § 13.39.040(K)(3)
K.Traffic patterns.1.Aircraft should conform to the following traffic pattern altitudes, unless otherwise specifically authorized by air traffic control or necessary for safety of flight as determined by the pilot in command:a.Small general aviation aircraft: 1,000 feet AGL;b.Larger and turbine general aviation aircraft: 1,500 feet AGL;c.Helicopters: 500 feet AGL; andd.Ultralight and gyrocopter...
Decibel Limits
Longmont caps sound measured 25 feet from the source at 50-55 dB(A) in residential zones, 55-65 dB(A) commercial, and 75 dB(A) industrial, with the lower numbers applying overnight.
Longmont Noise Decibel Limits
Some RestrictionsLongmont Municipal Code § 10.20.100
it is unlawful to make, cause to be made or assist another to make noise measured at a distance at least 25 feet from a noise source as set forth in the table immediately below between 10:00 p.m. and 7:00 a.m., unless the prohibited noise pressure level is contained entirely within the confines of private property which the person making or assisting such noise has a right to occupy. Such noise...
Vehicle Noise
Longmont deems motor vehicle noise from a licensed, non-commercial vehicle audible 300 feet away, from its engine, exhaust, or brakes, automatically unreasonable noise.
Longmont Vehicle Noise Limit
Some RestrictionsLongmont Municipal Code § 10.20.090(E)
Motor vehicle noise from a licensed, non-commercial vehicle audible 300 feet from the source of the sound. Motor vehicle noise means noise from engines, exhaust systems, and brakes. Except that amplified sound of 80 decibels or less as measured from the perimeter of the area covered by a use of public places permit for a special event issued pursuant to chapter 13.37 and city operations such a...
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