10 county-level rules, plus city-specific rules for 1 city in Weld County, Colorado.
Verified from official government sources
In unincorporated Weld County, residential noise may not exceed 50 dB(A) from 9 p.m. to 7 a.m. (55 dB(A) by day). In Greeley, sound-reproduction devices plainly audible at a property line between 10 p.m. and 7 a.m. are unlawful.
Weld County Code Sec. 14-9-40(C)
Between the hours of 9:00 p.m. and 7:00 a.m., the noise levels set forth above may be exceeded by up to ten (10) decibels for up to fifteen (15) minutes in a one-hour period.
Weld County's noise ordinance sets no construction hours. It exempts noise produced at a construction site and allows construction and industrial noise up to 80 dB(A). Greeley addresses construction noise only through its general nuisance-noise rule.
Weld County Code Sec. 14-9-60(N)
The provisions of this Article shall not apply to: ... N. Any noise produced at a construction site.
Weld County's noise ordinance does not cover barking. Sec. 14-9-60(E) exempts sounds made by dogs and farm animals. Persistent barking is handled as an animal nuisance through animal control, not by the decibel limits.
Weld County Code Sec. 14-9-60(E)
The provisions of this Article shall not apply to: ... E. Sounds made by dogs and by farm animals, including but not limited to bovines, goats, horses, fowl and llamas.
Weld County does not restrict leaf blowers. Sec. 14-9-60(J) exempts the sound made by a lawnmower, snow blower or other power or hand tool. No county time-of-day or decibel cap applies to yard equipment.
Weld County Code Sec. 14-9-60(J)
The provisions of this Article shall not apply to: ... J. The sound made by a lawnmower, snow blower or other power or hand tool.
Greeley limits loudspeakers and sound-amplifying equipment to 7 a.m.-10 p.m., and bans outdoor amplified sound outside those hours. Unincorporated Weld County treats amplified devices under its general 50-55 dB(A) limits.
Greeley Municipal Code Sec. 12-359
Unless a variance is granted authorizing additional or different hours of operation, commercial and noncommercial sound-amplifying equipment shall be operated only between the hours of 7:00 a.m. and 10:00 p.m. of each day; except that the operation of sound-amplifying equipment for commercial purposes on Sundays and legal holidays is permitted only between the hours of 10:00 a.m. and 4:00 p.m.
Weld County's noise ordinance does not regulate aircraft. Sec. 14-9-60(C) exempts noise from operating aircraft and other federally preempted activities. Aircraft and crop-duster noise is controlled by the FAA, not the county or Greeley.
Weld County Code Sec. 14-9-60(C)
The provisions of this Article shall not apply to: ... C. Any noise made during the operation of aircraft or other activities which are preempted by federal law, with respect to noise control.
Unincorporated Weld County caps industrial-area noise at 80 dB(A) daytime and 75 dB(A) at night. Normal mining and oil-and-gas noise is exempt. Greeley uses decibel review for mechanical/industrial noise plus its general disturbing-noise standard.
Weld County Code Sec. 14-9-60(L)
The provisions of this Article shall not apply to: ... L. Any noise produced in the course of normal mining operations or oil and gas exploration, drilling and production.
Unincorporated Weld County sets numeric dB(A) limits: 55 (day)/50 (night) for residential and commercial property, and 80/75 for industrial and construction. Any level above these at that time is prohibited. Greeley uses a plainly-audible standard instead.
Weld County Code Sec. 14-9-40(B)
Sound levels are hereby established for each type of property during specific hours of the day. Any sound level which exceeds the level set for a type of property at any time of day is prohibited. [Residential/Commercial 55 dB(A) day, 50 dB(A) night; Industrial/Construction 80/75; Nonspecified 55/50.]
In Greeley, outdoor amplified music is a violation outside 7 a.m.-10 p.m. or if indoor sound is plainly audible past your property line (Sec. 12-360). In unincorporated Weld County, outdoor music must stay within 55 dB(A) day / 50 dB(A) night at a residential boundary.
Greeley Municipal Code Sec. 12-360
A person commits a violation of this section if such person uses or operates sound-amplifying equipment: (1) Out of doors, except between 7:00 a.m. and 10:00 p.m. (2) Indoors, if the projection of the sound is plainly audible to persons out of doors and at or beyond the property line from which the sound is being emitted.
Unincorporated Weld County caps vehicle noise at 80-90 dB(A) by weight and speed zone and requires a working, unmodified muffler. Greeley bans loud tire-squealing, car stereos plainly audible at 50 feet, and engaged engine (Jake) brakes.
Weld County Code Sec. 14-9-40(E)
No person shall operate, anywhere in the County, any vehicle that is not equipped with a muffler in constant operation which is properly maintained to prevent noise in excess of that set forth in this Section.
1 cities in Weld County have their own noise ordinances rules. Each link goes to that city's dedicated page with code citations.
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