Animal Ordinances in Fort Collins, CO

If you live in Fort Collins or are thinking about moving there, animal ordinances are one of those things you probably won't think about until they affect you directly. Fort Collins has 14 specific rules on the books covering different aspects of animal ordinances, and some of them might surprise you.

Cat Rules

Fort Collins requires every dog or cat owner to license their pet within 14 days of taking possession, under Municipal Code § 4-31. The license comes from the City or the Larimer Humane Society, must be renewed annually, and requires proof of rabies vaccination. New residents get a 30-day grace period, and kittens and puppies four months or younger are exempt.

Key details: License deadline: Within 14 days of possession. Issuing agency: City or Larimer Humane Society. Term: One year, renewed annually. Vaccination proof: Rabies proof required, § 4-51. New-resident grace period: 30 days.

Licensing violations under Chapter 4 are not on the list of sections carved out as misdemeanors in § 4-196, so failing to license a dog or cat is a civil infraction. Under § 1-15(e), a civil infraction carries a penalty of up to $2,650, plus costs, and each day the animal goes unlicensed can count as a separate violation. Animal control officers and the Humane Society issue citations.

Chickens & Livestock

Fort Collins allows hens and female ducks without a farm-animal zoning designation, but caps flock size by lot size, bans roosters and drakes, and requires a Humane Society permit. Pygmy goats need a separate permit and rear-yard placement.

Key details: Chicken/duck cap under 0.5 acre: 8 hens. Cap 0.5-1 acre lot: 12 hens/ducks. Pygmy goats allowed: 2 minimum, female/altered only. Setback from property line: 15 feet absent neighbor consent. Permit required from: Larimer Humane Society.

Keeping poultry or goats without the required Humane Society permit, exceeding the lot-based flock cap, or keeping a rooster, drake, single goat, or a buck is a civil infraction under Sec. 4-196, subject to the general penalty schedule in Sec. 1-15(f) rather than criminal misdemeanor treatment reserved for dangerous-animal and cruelty violations.

Microchipping

Fort Collins does not require microchipping for ordinary pets. Microchipping is mandatory only for animals under a Dangerous Animal Permit, where a licensed veterinarian must implant an ID chip and register it with the Larimer Humane Society.

Key details: General pet microchip mandate: None. Dangerous-animal chip mandate: Sec. 4-197(a)(1)j and (b)(2). Who implants chip: Licensed veterinarian only. Chip data reported to: Larimer Humane Society.

Failing to microchip an animal as required by a Dangerous Animal Permit or court order is a permit violation under Sec. 4-197, enforceable through the same remedies available for any breach of permit conditions, up to surrender and impoundment of the animal by the Larimer Humane Society under Sec. 4-197(b)(5).

If you are coming from a city with tighter rules, you will find Fort Collins gives residents more flexibility on microchipping.

Beekeeping

Fort Collins allows backyard beekeeping but caps colony counts by tract size, requires flyway barriers near property lines, and lets the City Manager inspect apiaries and destroy noncompliant colonies as a declared nuisance.

Key details: Colonies on <=1/4 acre: 2 maximum. Colonies on 1+ acre: 8 maximum. No limit if hives >=: 200 feet from all property lines. Flyway barrier trigger: Hive within 25 feet of line. Flyway barrier height: At least 6 feet.

Keeping bees in violation of Division 2, including exceeding the colony-density cap, skipping a required flyway barrier, or maintaining an unmarked or abandoned hive, is declared a nuisance under Sec. 4-236 and can lead to summary destruction or removal of the colony by the City Manager, who is charged with enforcement of the Division under Sec. 4-237, in addition to the standard civil-infraction penalties under Sec. 4-196.

Wildlife Feeding

Feeding songbirds, squirrels, ducks, geese or any other wildlife inside a City natural area is unlawful without a Natural Areas Department permit, under Municipal Code § 23-193(d)(11). The Department enforces it as a petty offense, and a separate citywide ban on feeding wild geese or ducks anywhere in Fort Collins runs under § 4-73.

Key details: Scope: Feeding inside City natural areas. Covers: Songbirds, squirrels, ducks, geese, other wildlife. Exception: Natural Areas Department permit. Classification: Petty offense, § 23-193(f). Penalty: Up to $300, up to 10 days.

Feeding wildlife in a natural area under § 23-193(d)(11) is expressly listed in § 23-193(f) as a petty offense, punishable under the City's current penalty table at § 1-15(h) by up to 10 days in jail and a fine of up to $300. Natural Areas rangers and animal control officers can issue citations on sight; a companion violation of the citywide § 4-73 geese-and-ducks feeding ban requires a prior written warning before any citation can issue.

Breed Restrictions

Fort Collins has no breed-specific ban; instead, Municipal Code § 4-96 bars owning any "dangerous animal" unless the Humane Society or Municipal Judge has issued a permit, based on the animal's conduct rather than its breed. A dangerous-animal finding triggers annual registration, $1 million liability insurance and strict confinement rules under § 4-197.

Key details: Breed rule: No breed-specific ban exists. Standard: Conduct-based dangerous animal finding. Permit issuer: Humane Society or Municipal Judge. Insurance: $1,000,000 liability required, § 4-197. Confinement: Locked pen 15 ft from dwellings.

Sections 4-96 and 4-97 are both on the § 4-196 misdemeanor exception list, so violating a dangerous-animal permit or owning a vicious animal is a criminal misdemeanor, not a civil infraction, punishable under § 1-15 by a fine and possible jail time. Under § 4-197(b), the Municipal Judge can also order the animal destroyed, require microchipping and owner education classes, or order the animal surrendered if permit conditions are violated.

This is not one of those rules that cities tend to ignore. Fort Collins actively enforces its breed restrictions requirements.

Bird Protection

The entire City of Fort Collins is a designated wild bird sanctuary, and it is unlawful to shoot, capture, trap, or otherwise harm wild birds, their nests, eggs or young without a Police Chief permit issued for a genuine nuisance situation.

Key details: Sanctuary scope: Entire City of Fort Collins. Permit issuer: Chief of Police. State sign-off required: Colorado Division of Parks and Wildlife. Permit decision deadline: 5 working days. Violation classification: Misdemeanor, not civil infraction.

Killing, capturing, trapping, or molesting wild birds or their nests without a Police Chief permit is a misdemeanor under Sec. 4-196, which specifically exempts Sec. 4-157 from the Chapter's default civil-infraction treatment; penalties follow the general criminal penalty provisions of Sec. 1-15, including fines and possible jail time.

Compared to other cities, Fort Collins takes a harder line on bird protection. The enforcement and penalty structure reflects that.

Mandatory Spay/Neuter

Fort Collins has no citywide mandatory spay/neuter law for ordinary pets. The only spay/neuter mandate applies narrowly to animals under a permanent Dangerous Animal Permit, which must be altered within ten days of the permit becoming permanent.

Key details: General pet spay/neuter mandate: None. Dangerous-animal spay/neuter deadline: 10 days after permit made permanent. Documentation goes to: Larimer Humane Society. Shelter/rescue sterilization rule: Sec. 4-142, before release to new owner.

Failing to have a dangerous animal spayed or neutered within the ten-day window is a violation of the Dangerous Animal Permit's conditions under Sec. 4-197 and can trigger the enforcement remedies the Municipal Judge attaches to the permit, including revocation, impoundment, and euthanasia for noncompliance under Sec. 4-197(b)(5); it is not enforced against ordinary unaltered pets.

If you are coming from a city with tighter rules, you will find Fort Collins gives residents more flexibility on mandatory spay/neuter.

Veterinary Clinic Zoning

Fort Collins requires every small animal veterinary clinic or hospital to operate inside a fully enclosed, soundproof building, hold noise to 65 decibels at the property line, and eliminate offensive odor, under Section 3.8.5 of the Transitional Land Use Code. Boarding is banned except when medically necessary for a patient already receiving treatment.

Key details: Noise limit: 65 decibels at the property line. Boarding: Only if medically necessary for treatment. Building requirement: Fully enclosed, soundproof structure. Governing section: Transitional Land Use Code § 3.8.5. Odor: Must not reach neighboring properties.

A veterinary clinic that exceeds 65 decibels at a neighboring property line, lets odor escape to adjacent properties, houses animals outdoors instead of in a soundproof building, or boards animals beyond what a patient's medical treatment requires is out of compliance with Section 3.8.5's design standards. Because these are building and site-design conditions tied to the original development approval, violations are typically caught at inspection or through a zoning enforcement complaint rather than a routine business-license check.

Pet Store Rules

Fort Collins bars retail stores from selling, adopting out, or giving away cats and dogs on their premises, an adoption-only rule that lets stores host rescue and shelter animals instead of stocking their own.

Key details: Retail sale of dogs/cats: Prohibited citywide. Exempt sellers: Hobby breeders, rescues, shelters. Adoption-hosting allowed: Yes, no fee/ownership by store. Effective date: September 3, 2024. Also banned in public places: Streets, parks, lots (Sec. 4-123).

Violating the retail sale ban or the public-places sale ban is a civil infraction under Sec. 4-196, punishable per the general penalty schedule in Sec. 1-15(f); each animal offered or sold in violation can support a separate citation from Fort Collins Animal Control acting through the Larimer Humane Society.

This is one of the stricter rules in Fort Collins's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Wildlife Rescue Permits

Fort Collins doesn't issue a dedicated wildlife-rescue permit; it treats a wildlife rescue and education center as a zoning use requiring discretionary approval. In the Urban Estate (U-E) District, Section 4.2(B)(3)(b) of the Transitional Land Use Code lists 'wildlife rescue and education centers' among uses that need full Planning and Zoning Board review rather than administrative sign-off.

Key details: U-E District rule: Wildlife rescue center needs P&Z Board review. Same requirement in: R-U-L, R-F, R-L, L-M-N districts. L-M-N extra limit: Only within 1,000 ft of East Vine Drive. Review type: Planning and Zoning Board, not administrative. Applies to: Applications filed before May 17, 2024.

A wildlife rescue and education center that opens in the U-E District, or any of the other listed districts, without going through Planning and Zoning Board review is operating an unpermitted use; the Building and Zoning Director can deny the building permit or certificate of occupancy until the operator secures Board approval, and once approved, the operation must comply with whatever conditions the Board attaches to that specific decision.

This is one of the stricter rules in Fort Collins's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Dog Leash Laws

Fort Collins requires every pet animal except birds to be kept under restraint at all times, and it is unlawful for an owner to let one run at large in the City under Municipal Code § 4-93. Exceptions cover posted dog parks, police animals and permitted natural-area off-leash zones.

Key details: Requirement: All pets except birds restrained. "At large" includes: Tethering within reach of street. Exceptions: Dog parks, natural-area permits, police animals. Pet birds: Only "physical control" required. Females in heat: Must be confined.

Section 4-93 is not on the § 4-196 misdemeanor list, so an animal-at-large citation is a civil infraction under § 1-15(e), carrying a fine of up to $2,650 plus costs, and each day the animal is loose can be charged separately. An animal control officer who impounds a loose pet may also assess impound fees under § 4-140 before the owner can reclaim it.

Pet Limits

Fort Collins sets no fixed numeric cap on dogs or cats; instead, Municipal Code § 4-116 bars keeping more pet animals than can be "properly maintained in a healthy condition" without creating a health hazard or a nuisance to neighbors. Chickens and ducks get their own numeric caps under § 4-117.

Key details: Numeric cap: None for dogs/cats. Standard: Health hazard or neighbor nuisance. Enforcement: Case-by-case after complaint. Poultry rule: Separate numeric scale, § 4-117. Penalty: Civil infraction, up to $2,650.

Section 4-116 is not on the § 4-196 misdemeanor exception list, so an over-quantity citation is a civil infraction, punishable by a fine of up to $2,650 under § 1-15(e) plus court costs, and the Municipal Judge may order the nuisance abated, which can include reducing the number of animals kept on the property.

Fort Collins is more permissive than most cities when it comes to pet limits. That said, there are still limits.

Exotic Pets

Fort Collins bans keeping or feeding a specific list of wild and exotic animals under Municipal Code § 4-73, including bears, non-domestic cats, skunks, venomous reptiles, raccoons, deer, wolves, coyotes, foxes and primates, unless federal or state law authorizes possession. Violators face a civil infraction citation from animal control.

Key details: Bans: Bears, wild felines, skunks, primates. Also bans: Deer, wolves, coyotes, foxes. Feeding: Feeding banned species also prohibited. Exception: State wildlife rehab license. Defense: Circus/menagerie license, § 15-291.

Section 4-73 is not among the misdemeanor exceptions listed in § 4-196, so keeping or feeding a banned wild or exotic animal is prosecuted as a civil infraction, carrying a fine of up to $2,650 under § 1-15(e) plus court costs. Each day the animal remains in a person's possession can be charged as a separate violation, and an animal control officer may seize an unlawfully kept animal.

This is one of the stricter rules in Fort Collins's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

The Bottom Line

Fort Collins is tougher than many cities when it comes to animal ordinances. Out of the 14 rules covered here, 5 are rated strict. If you are a homeowner, renter, or business owner in Fort Collins, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

Keep in mind that Fort Collins can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.