Larimer County, CO Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Heavy vehicle ≤35 mph
- 86 dB(A)
- Heavy vehicle >35 mph
- 90 dB(A)
- Cars/motorcycles ≤35 mph
- 80 dB(A)
- Cars/motorcycles >35 mph
- 84 dB(A)
- Measurement distance
- At least 25 feet
Summary
Both Fort Collins (§ 20-28) and unincorporated Larimer County cap vehicle noise identically: heavy vehicles (10,000+ lb GVWR) at 86 dB(A) where posted 35 mph or less and 90 dB(A) above; lighter vehicles and motorcycles at 80 and 84 dB(A).
No person shall operate or cause to be operated a public or private motor vehicle or motorcycle on a public right-of-way at any time in such a manner that the sound level emitted by the motor vehicle or motorcycle exceeds the levels set forth below: [10,000+ lb GVWR: 86 / 90; any other motor vehicle or motorcycle: 80 / 84].
Full Breakdown
Fort Collins Municipal Code § 20-28 prohibits operating any motor vehicle or motorcycle on a public right-of-way so its sound exceeds set limits: vehicles with a manufacturer GVWR of 10,000 lb or more at 86 dB(A) (posted 35 mph or less) and 90 dB(A) (over 35 mph); all other vehicles and motorcycles at 80 and 84 dB(A). Off-road operation must meet § 20-23. Noise is measured at least 25 feet from the lane. Larimer County Ordinance 97-03 uses the same 86/90 and 80/84 dB(A) thresholds, measured at least 25 feet from the near side of the traveled way.
Violations & Fines
County: $30/$60/$300 escalating fines. Fort Collins: summons under § 20-29; loud modified exhausts and illegal mufflers are common triggers.
Frequently Asked Questions
Is a loud exhaust illegal in Fort Collins?
Do the same limits apply on county roads?
Sources & Official References
Other rules in Larimer County
Compare Larimer County to another location·View the Colorado noise ordinances overview
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