Longmont, CO Local Ordinances Guide

Longmont, Colorado may not be the biggest city in the state, but it has its own set of local rules that residents need to follow. With 129 tracked ordinances across 38 categories, there is more here than you might expect.

Sidewalk & Pedestrian Rules

Encroachment Permits: Longmont requires a separate infrastructure permit before anyone builds, installs or operates infrastructure such as pipes, lines, conduit or private facilities on, under or above city-owned property, under Longmont Municipal Code § 13.04.300. The public works/water utilities director issues the permit, and applicants must carry insurance, post financial security and follow city design standards.

Also covered: Obstruction Rules (moderate), Sidewalk Repair (moderate). See the full sidewalk & pedestrian rules guide for Longmont for details.

Parking Rules

Abandoned Vehicles: Longmont bans abandoning or publicly keeping any vehicle in the city under LMC § 11.12.040, covering vehicles left on private property over 48 hours without consent, sleeper vehicles parked on public rights-of-way, and junked vehicles left on any street or private lot; violators face towing, a $50 impound release fee, and a $50 civil parking fine under § 11.16.030..

Also covered: Driveway Rules (moderate), Loading Zones (moderate), Commercial & Oversized Vehicles (moderate). See the full parking rules guide for Longmont for details.

Accessory Structures

ADU Rental Restrictions: Longmont bars accessory dwelling units from being used as short-term rentals outright, under Longmont Municipal Code section 15.02.080.D.2.c. A separate ADU standard in section 15.02.080.E.3.g also blocks selling an ADU apart from the main house, keeping accessory units tied to long-term, owner-linked occupancy rather than the short-term rental market..

Also covered: Shed & Carport Rules (moderate), ADU Rules (moderate). See the full accessory structures guide for Longmont for details.

Building Safety

Childcare Center Rules: Longmont's amended International Existing Building Code lets a home caring for five or fewer children, or five or fewer people receiving custodial care, stay classified as a Group R-3 residential occupancy instead of a commercial Group E or institutional Group I-4 use. The exception, at Municipal Code section 16.40.200, spares small in-home day cares from the sprinkler retrofit section 803.2 would otherwise force during renovation work..

Also covered: Carbon Monoxide Detectors (moderate), Elevator Maintenance (moderate), Electrical Permits (moderate). See the full building safety guide for Longmont for details.

Hotels & Lodging

Transient Occupancy Tax: Longmont levies a 2% lodgers tax on hotel and motel rooms and other short-term lodging, on top of the city's regular sales and use tax, and both the guest and the lodging provider can be cited for nonpayment..

Noise from Specific Sources

Delivery Truck Noise: Longmont Municipal Code § 10.20.100(D)(2) bars truck or rail loading and unloading within 250 feet of a residential lot between 10 p.m. and 7 a.m., with a carve-out letting retail grocery stores load overnight; a separate rule bans refuse-truck loading between 7 p.m.

Also covered: Car Alarm Limits (permissive). See the full noise from specific sources guide for Longmont for details.

Trash & Recycling

Collection Schedule: Every single-family and multifamily dwelling in Longmont must subscribe to and pay for the city's routine curbside solid waste and recycling collection, with the director setting routes and collection days under §§ 14.12.020 and 14.12.050..

Also covered: Bulk Item Disposal (moderate), Yard Waste Collection (moderate), Recycling Requirements (restrictive). See the full trash & recycling guide for Longmont for details.

Business Licensing & Operations

Adult Entertainment: Longmont requires a city license to operate a sexually oriented business, restricts them to the MU-E zoning district, and keeps them 1,000 feet from schools, churches, parks, homes and each other..

Also covered: Towing Companies (restrictive), Secondhand Dealers (moderate), Pawnbrokers (moderate). See the full business licensing & operations guide for Longmont for details.

Public Conduct

Public Urination: Longmont bans depositing human excrement or waste in an unsanitary manner on any public or private property citywide, covering public urination and defecation as a strict-liability code violation..

Also covered: Public Marijuana Use (strict), Public Alcohol Use (moderate), Outdoor Smoking Restrictions (restrictive). See the full public conduct guide for Longmont for details.

Public Health Rules

Syringe Disposal: Longmont's solid waste code classifies used needles and syringes from home use as infectious waste, which the city excludes from routine curbside pickup: residents can't bag sharps with regular household trash or recycling..

Also covered: Rodent Control (moderate). See the full public health rules guide for Longmont for details.

Mobility & Curb Rules

Bike Lane Rules: Longmont's traffic code bars drivers from stopping, standing, or parking in any area marked with a bicycle lane, one of a list of specific places where stopping is prohibited citywide..

Also covered: Red-Light Cameras (moderate), E-Bike Classes (limited). See the full mobility & curb rules guide for Longmont for details.

Fire Regulations

Fireworks: Longmont bans discharging any fireworks on city streets, alleys, sidewalks, parks or other city property without a sparkler permit, and bans discharge from vehicles or near grassland and combustible material. Selling to or purchasing by anyone under 16 is also illegal, and only permissible fireworks like sparklers and fountains may be possessed under Municipal Code § 10.60.030..

Also covered: Outdoor Burning (restrictive), Propane Storage (moderate), Wildfire Zones (moderate). See the full fire regulations guide for Longmont for details.

Special Events & Permits

Parade Permits: Anyone parading, marching or holding a similar performance on a Longmont street, highway or public place needs a written parade permit from the police chief under Municipal Code § 11.24.010. The application costs $50 and must be filed at least 24 hours before the event, with the chief able to modify, deny, or condition the route..

Also covered: Block Party Permits (restrictive), Park Event Permits (moderate), Sidewalk Dining & Cafés (moderate). See the full special events & permits guide for Longmont for details.

Animal Ordinances

Exotic Pets: Longmont bans keeping any animal in the city except household pets, zoning-permitted livestock, state/federally licensed birds of prey, licensed wildlife-rehab animals, and permitted backyard chicken hens: exotic and wild animals are off the list..

Also covered: Bird Protection (restrictive), Cat Rules (moderate), Beekeeping (moderate). See the full animal ordinances guide for Longmont for details.

Cannabis Regulations

Dispensary Zoning: Longmont bans marijuana cultivation, product manufacturing, and testing facilities citywide, carving out one narrow exception: state- and city-licensed marijuana stores operating under Chapter 6.70's capped licensing program..

Also covered: Buffer Zones (moderate). See the full cannabis regulations guide for Longmont for details.

Environmental Rules

Stormwater Management: Longmont bans any non-stormwater discharge into its municipal storm sewer system, covering hazardous chemicals, construction runoff and other pollutants, with narrow listed exemptions and daily civil penalties for violations..

Also covered: Erosion Control (restrictive), Flood Elevation Requirements (moderate), Flood Zones (moderate). See the full environmental rules guide for Longmont for details.

Rental Property Rules

Repairs & Habitability: Landlords in Longmont must supply heat to every rented unit from September 1 through May 1 under the city's amended International Property Maintenance Code. Longmont Municipal Code § 16.20.330 rewrites the model code's heat-supply section to fix that six-month window citywide, backed by daily-offense penalties and a lien process under § 16.20.080..

Soliciting & Door-to-Door

No-Knock Registry: Longmont makes it a violation to solicit door-to-door at a private residence that has a "No Solicitors" or "No Soliciting" sign conspicuously posted. A companion rule bars any solicitor from staying on the property after being told to leave, sign or no sign.

Noise Ordinances

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.

Also covered: Aircraft Noise (limited), Barking Dogs (moderate), Vehicle Noise (moderate). See the full noise ordinances guide for Longmont for details.

Homelessness & Encampment Rules

Encampment Sanitation: Camping in a Longmont park, parkway, open space or other city property without a permit is unlawful under Municipal Code § 10.24.120, and camping on private property requires the owner's permission. "Camp" means erecting a shelter and living there; brief napping or picnicking under two hours a day is excluded..

Curfew Laws

Juvenile Curfew: Minors under 18 can't be in a Longmont street, alley, park, playground, schoolyard or other public area between 11 p.m. and 5 a.m.

Also covered: Park Curfew (moderate). See the full curfew laws guide for Longmont for details.

Water Use Rules

Turf Replacement Rebates: Starting January 1, 2026, Longmont's land development code bars new landscape plans from installing nonfunctional turf, nonfunctional artificial turf and invasive plant species, implementing state mandates SB24-005 and HB25-1113 citywide. The rule covers multifamily residential, commercial, industrial, institutional and common-interest community properties plus public rights-of-way, medians and transportation corridors, reviewed under Municipal Code § 15.05.040.C.4.a..

Outdoor Lighting

Dark Sky Rules: Longmont requires every new or replacement outdoor light fixture to be full cutoff, keeping light from escaping above the fixture, under Municipal Code § 15.05.140.G.2. Small fixtures are exempt: individual lights under 500 lumens, string lights under 150 lumens per bulb, and fixtures no warmer than 3000 Kelvin don't have to meet the full-cutoff standard..

Also covered: Light Trespass & Shielding (moderate). See the full outdoor lighting guide for Longmont for details.

Drone Rules

Airport Proximity Rules: Anyone flying a drone within five miles of Longmont's Vance Brand Municipal Airport must comply with all applicable legal requirements, which under Longmont Municipal Code § 13.39.040(L)(6) can include notifying the airport manager and getting written permission before flying a UAV or UAS within protected airspace. The rule sits among a list of restricted airport-area activities requiring advance notice to the airport manager..

Building Setbacks & Zoning

Setback Rules: Longmont's Land Development Code sets minimum yard setbacks by zoning district in the master dimensional table at Municipal Code Section 15.03.070, Table 15.03.020(14), which controls whenever a district-specific table conflicts. In the R-SF single-family district a dwelling needs a 15-foot front setback, cut to 10 feet with alley garage access, a 5-foot side yard, and a 20-foot rear yard, or 6 feet where the lot backs an alley..

Also covered: Structure Height Limits (moderate). See the full building setbacks & zoning guide for Longmont for details.

Tree Protection

Parkway Planting: Longmont requires deciduous canopy trees planted in the tree lawn or a tree grate along local and collector street rights-of-way at a rate of one tree for every 40 linear feet, inside an eight-foot planting strip between the curb and sidewalk on streets built with detached sidewalks..

Short-Term Rentals

Primary-Residence-Only Rule: Longmont only licenses a short-term rental if it is the applicant's primary residence or a single second/investment dwelling owned by a city resident, under Longmont Municipal Code section 15.02.080.D.14.a. Anything else, including out-of-town investors or a second rental beyond the one allowed per resident, must be denied..

Also covered: Occupancy Limits (moderate), Noise Rules (moderate), Repeat Violator Strikes (moderate). See the full short-term rentals guide for Longmont for details.

Invasive Plant Rules

Prohibited Species: Longmont declares ragweed, thistle, knapweed, bindweed, dandelion and any state-listed Type A, B or C noxious weed a public nuisance on any lot in the city, and § 9.32.010 requires the owner to remove them..

Fence Regulations

Material Restrictions: Longmont bans barbed wire, tin or sheet metal, and electrically charged fences citywide, with a narrow industrial-district exception for barbed wire topping woven-wire fences..

Also covered: Height Limits (moderate), Fence Permit Requirements (moderate). See the full fence regulations guide for Longmont for details.

Garage & Yard Sales

Frequency, Duration & Permits: Longmont limits garage sales to three consecutive days, and no more than 12 total days in any 12-month period, at the same residential location..

Home Business

Signage Rules: Longmont bars any advertising, display or other outward sign of a home occupation, so a home-based business operating out of a residence cannot post a sign, and the ban applies alongside caps on the space, staffing, retail activity and traffic a home occupation can generate..

Also covered: Home Daycare (moderate), Zoning & Home Occupation Permits (moderate), Customer Traffic Restrictions (moderate). See the full home business guide for Longmont for details.

Swimming Pools & Spas

Pool Permits: Building a pool in Longmont requires a permit under the city's adopted International Swimming Pool and Spa Code, and Longmont Municipal Code § 16.28.040 rewrites the submittal requirement: construction documents must accompany every permit application and be prepared by a state-licensed design professional unless exempt..

Also covered: Fencing & Safety Requirements (moderate). See the full swimming pools & spas guide for Longmont for details.

Landscaping Rules

Tree Removal & Heritage Trees: Removing, pruning or destroying a tree or shrub on Longmont city property without an approved permit from the director of Public Works and Natural Resources is unlawful under Longmont Municipal Code § 13.24.120. Unauthorized removal after a permit denial costs three times the tree's appraised value under § 13.24.130, and anyone responsible for a tree that dies on city property must replace it if the director requires under § 13.24.140..

Also covered: Weed Ordinances (moderate), Native Plants (moderate), Water Restrictions (moderate). See the full landscaping rules guide for Longmont for details.

Property Maintenance

Property Blight: Longmont expands the International Property Maintenance Code's dangerous-structure criteria with local additions covering structural failure risk, wracked or buckled walls, and buildings that have lost required strength or fire resistance..

Also covered: Snow & Sidewalk Clearing (moderate), Vacant Lot Maintenance (moderate). See the full property maintenance guide for Longmont for details.

HOA Rules

Board Governance: Longmont requires developers to file a declaration of covenants and restrictions before a property owners' association can take over common areas, and to prove the association is legally established before construction acceptance..

Zoning Overlays & Bonuses

Downtown Design Guide: Inside Longmont's Downtown Development Authority area, the city-adopted Downtown Sign Design Standards (Appendix A) supplement the citywide sign code, and no sign permit issues there without a separate downtown design compliance certificate..

Also covered: Density Bonus Law (moderate). See the full zoning overlays & bonuses guide for Longmont for details.

Food Trucks & Mobile Vendors

Sidewalk & Mobile Vending: Longmont requires a permit for mobile retail food vendors and pushcarts, restricts them to nonresidential zoning districts, and keeps them at least 250 feet from any restaurant unless every restaurant owner within that radius consents in writing. Ice cream vendors are exempt from the zoning limit.

Also covered: Food Truck Permits (moderate), Vending Zones (moderate). See the full food trucks & mobile vendors guide for Longmont for details.

Sign Regulations

Holiday Displays: Longmont's sign code flatly prohibits inflatable signs -- balloons, inflatable figures, and similar fluttering or revolving devices -- with no seasonal or temporary-permit exception, unlike pennants and windsocks..

Also covered: Window Signs (limited), Digital Billboards (restrictive). See the full sign regulations guide for Longmont for details.

What to Do With This Information

Think of this as a map of the regulatory landscape in Longmont. For any rule that directly affects a decision you are making, click through to the full ordinance page for penalty details and exceptions, and confirm with the city if the stakes are high.