Is It Illegal to Kill Bees in Colorado? What the Law Actually Says

You spot a hive under your porch or a swarm clustered on a fence post, and your first instinct might be to grab a can of wasp spray. Before you do, you should know that killing bees in Colorado isn’t a single, simple question with one answer. The legality depends on the species you’re dealing with, whether the colony is managed or wild, and which pesticide you reach for.

Colorado has spent the last few years tightening its pollinator protections, from a 2023 pesticide law to a 2024 measure that reclassified bees as animals under state wildlife programs. This guide walks through what’s actually allowed, what crosses a legal line, and what penalties you could face if you get it wrong.

Pro Tip: If you’re unsure whether a colony on your property is a managed hive or a wild swarm, contact a local beekeeping association before treating it. Many will remove swarms for free rather than see them destroyed.

Is It Illegal to Kill Bees in Colorado

For most bees you’ll encounter around a home or yard, killing them isn’t a criminal act in Colorado. Honey bees (Apis mellifera) aren’t native to North America and, as a species, don’t carry blanket legal protection the way an endangered animal would. That said, the honest answer is “it depends,” because a handful of overlapping rules can turn an otherwise legal pest-control decision into a costly mistake.

Three factors matter most: whether the bees belong to a registered beekeeper, whether the species involved is a protected native pollinator, and whether you use a restricted pesticide to do the killing. Colorado has increasingly leaned toward protection rather than extermination, partly because the state is home to an especially rich bee population. Colorado ranks among the top states in the country for bee diversity, which is part of why lawmakers have moved to shield pollinators from casual destruction.

If you want to know exactly what species share your yard before deciding how to handle them, the types of bees found in Colorado vary widely from docile native ground-nesters to the occasional managed honey bee colony that got away from its keeper.

Federal Law on Killing Bees and Protected Species Exceptions

At the federal level, there’s no blanket law against killing a bee. The primary vehicle for bee protection in the United States is the Endangered Species Act, and it only reaches species that have actually been listed. So far, that list includes exactly one bee: the rusty patched bumble bee (Bombus affinis), which the U.S. Fish and Wildlife Service placed on the endangered list through a rule finalized in the Federal Register in January 2017.

Killing a species listed under the ESA is called an unlawful “take,” and the penalties are steep. Anyone who knowingly harms a federally listed species can face a fine of up to $25,000 per violation from the federal government, according to Ballotpedia’s summary of endangered species enforcement in Colorado. The catch is that no bee currently protected under the ESA is documented as established in Colorado, so this federal exposure is more of a “watch this space” issue than an everyday risk for most residents.

That’s changing fast. Roughly a fifth of Colorado’s native bumblebee species have been petitioned for federal listing, which means the list of legally off-limits bees in the state could grow. Federal pesticide law also plays a supporting role here: the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) gives the EPA authority over which chemicals can legally be sold and applied, and that authority overlaps directly with state-level pesticide restrictions covered later in this guide.

Key Insight: Federal bee protection in Colorado currently hinges on future ESA listings rather than existing ones. The bigger day-to-day legal risk comes from state pesticide rules and local ordinances, not federal wildlife law.

Colorado’s Laws on Killing Managed Honey Bee Colonies

Managed honey bee colonies, meaning hives that belong to a registered beekeeper, sit in a different legal category than wild swarms. Colorado’s oversight of these colonies traces back to the Colorado Bee and Bee Products Act, which the state Department of Agriculture describes as originally adopted in 1963 to inspect hives for disease and prevent outbreaks from spreading between apiaries.

Under this framework, the Commissioner of Agriculture has authority to inspect apiaries when disease is suspected and, historically, to require destruction of diseased colonies to stop the spread. That’s the one scenario where state law actually mandates killing bees rather than restricting it. Outside of disease control, destroying someone else’s registered hive without consent isn’t a bee-specific crime in Colorado the way it is in states like Texas, but it can still expose you to general property damage and criminal mischief claims, since a managed colony is the beekeeper’s personal property with real economic value.

If you’re a beekeeper yourself, or thinking about becoming one, Colorado also layers in local ordinances on top of state law. Cities including Arvada, Brighton, Lakewood, and Jefferson County have all passed municipal beekeeping rules, according to the Colorado State Beekeepers Association’s urban beekeeping resource, while some counties, like unincorporated Arapahoe County, restrict backyard hives on smaller lots entirely. Anyone transporting registered colonies across county or state lines for pollination contracts should also check certification requirements, a process that runs on similar inspection logic to the rules for transporting livestock in Colorado.

If you’re building or expanding a hive setup of your own, the full beekeeping laws in Colorado cover registration requirements, hive placement, and disease-reporting obligations in more depth.

Rules for Removing a Feral Bee Swarm or Hive on Your Property in Colorado

Feral swarms are a different situation entirely. A cluster of bees that broke away from a managed hive, or a wild colony that’s set up in your eaves, generally isn’t anyone’s registered property. On private land, you’re typically within your rights to remove or exterminate a feral hive, the same general principle that governs how residents handle other unowned wildlife on their own property, similar in spirit to how feral cat laws in Colorado treat unowned animals differently from pets.

That legal freedom doesn’t mean extermination is the recommended first move. Pest control professionals in the state consistently point out that honey bees carry outsized ecological and agricultural value, and Colorado has historically encouraged relocation over extermination wherever practicable, according to Colorado Pest Authority’s guidance on wasp and bee control. Many local beekeepers will collect a swarm for free since it’s essentially a free colony for them.

There’s also a public-safety exception worth knowing about. In 2013, when Africanized honey bees, sometimes called “killer bees,” turned up in Palisade for the first time in the state, officials tested the colony and destroyed the hive once the species was confirmed, as reported by CBS News Colorado’s coverage of the discovery. That case illustrates the outer limit of the “your property, your call” rule: when a colony poses a genuine safety risk, destruction becomes the standard response rather than the exception.

1. Identify the species first. Confirm whether you’re dealing with honey bees, a native bumble bee, or a solitary species before choosing removal or extermination.
2. Call a local beekeeper or swarm-removal service. Many will relocate a swarm at no cost.
3. Reserve extermination for confirmed safety risks, such as aggressive Africanized colonies or hives in high-traffic areas near children or pets.
4. Time treatments around late fall if extermination is truly necessary, since colonies typically become inactive after a killing frost.

Pesticide Restrictions That Protect Bees in Colorado

Colorado’s most significant recent bee-protection law doesn’t target killing bees directly. It targets the chemicals most likely to kill them en masse. Senate Bill 23-266 restricted the retail sale of neonicotinoid pesticides, commonly called “neonics,” a class of insecticides that a National Geographic study found can be up to 1,000 times more toxic to bees than DDT, as cited in CoPIRG’s coverage of the bill’s passage.

The law took full effect on July 1, 2024, when neonics were pulled from open retail shelves statewide. As of that date, Environment Colorado confirmed the restriction limits neonic sales to licensed pesticide dealers only, making it far harder for the average homeowner or gardener to buy them casually. Colorado became the ninth state overall, and the first outside the eastern United States, to put this kind of limit in place.

The Colorado Department of Agriculture enforces this restriction, along with broader pesticide licensing, through the Colorado Pesticide Applicators’ Act. Federal oversight runs in parallel: the EPA regulates which pesticide products can be sold nationwide at all under FIFRA, meaning a chemical banned federally can’t be legally sold in Colorado regardless of state rules. If you’re weighing pest control options that might affect a bee colony near livestock, poultry, or other animals, it’s worth reviewing how these restrictions intersect with related rules like the backyard chicken laws in Colorado, since pesticide drift can affect more than just bees.

Pesticide Rule	What It Covers	Effective
SB23-266 (Neonic Restriction)	Limits retail sale of neonicotinoids to licensed dealers	July 1, 2024
Colorado Pesticide Applicators’ Act	Licensing and enforcement for commercial pesticide use	CRS § 35-10-101 et seq.
FIFRA (Federal)	National product registration and label enforcement	Ongoing, EPA-administered

Protected Native Bee Species in Colorado

Colorado’s native bee population is larger than most residents realize. The state is home to more than 900 native bee species, ranking fifth in the nation for bee diversity, according to Environment Colorado’s legislative tracking of the state’s pollinator diversity. Among these, bumblebees draw the most conservation attention.

The western bumble bee (Bombus occidentalis) is the state’s most closely watched species right now. Colorado Parks and Wildlife has designated it a Tier 1 Species of Greatest Conservation Need in its 2025 State Wildlife Action Plan, and the species has been formally proposed for federal Endangered Species Act listing after a documented 72% population decline in parts of the state. It isn’t legally protected in the same binding way as a fully listed ESA species yet, but its Tier 1 status signals that state wildlife officials are actively prioritizing it.

The American bumble bee (Bombus pensylvanicus) is another species under review, petitioned for federal listing and already flagged as a species of concern by Canada’s wildlife status committee. Roughly a fifth of Colorado’s 24 native bumblebee species fall into this “under consideration” category, a shift driven partly by a 2024 state law that, for the first time, formally classified bees and other invertebrates as animals for the purposes of Colorado’s wildlife programs and funding, according to Environment America’s summary of the 2024 legislative session.

Important Note: The 2024 law reclassifying bees as animals opens the door for state wildlife funds to support pollinator conservation, but it hasn’t yet translated into criminal penalties for killing unlisted native bees. Legal protection for most Colorado native bee species still depends on future ESA or state listing decisions.

For a closer look at which native species you’re most likely to encounter and how to tell them apart from managed honey bees, the guide to bee species found throughout Colorado is a useful next stop.

Penalties for Illegally Killing Bees in Colorado

The penalties you could face for killing bees in Colorado scale with the legal category involved, and they range from essentially nothing to serious federal fines. It helps to think of it as a tiered system.

• Unlisted feral or common native bees on your own property: No specific penalty under current Colorado law, though local ordinances may still apply.
• Federally listed species (currently only the rusty patched bumble bee nationwide): Fines up to $25,000 per violation under the Endangered Species Act, per Ballotpedia’s review of federal endangered species penalties.
• Colorado-listed threatened or endangered wildlife: The state sets minimum recoverable values for unlawfully taken wildlife, with figures reaching $1,000 per animal for endangered species and $700 for threatened species under the enforcement framework tracked by the Association of Fish and Wildlife Agencies. Whether this framework extends to specific bee species depends on future state listing decisions.
• Destroying a registered beekeeper’s managed colony without consent: Potential exposure under general property damage and criminal mischief laws, separate from any bee-specific statute.
• Illegal pesticide sale or misuse under SB23-266 or FIFRA: Civil enforcement through the Colorado Department of Agriculture and the EPA.

Because bees don’t fall neatly under Colorado’s traditional animal cruelty framework, which was written primarily with vertebrate animals in mind, someone wondering whether harming an insect could trigger cruelty charges should look instead at the wildlife, pesticide, and property statutes outlined above. For a broader sense of how the state defines and prosecutes cruelty toward animals generally, the animal cruelty laws in Colorado lay out the vertebrate-focused standards that bees currently fall outside of.

If your situation involves wildlife takings more broadly, such as accidentally disturbing a protected species while managing land or property, it’s worth comparing the general framework in Colorado’s hunting laws, which share the same underlying wildlife-take statute referenced in bee-related enforcement.

Legal Disclaimer: This article provides general information about Colorado bee-related laws and is not a substitute for legal advice. Regulations can change, and local ordinances vary by city and county. Consult the Colorado Department of Agriculture, Colorado Parks and Wildlife, or a licensed attorney for guidance specific to your situation.

Colorado’s approach to bees has shifted noticeably over the past few years, from disease-focused hive inspections to pesticide restrictions and a formal recognition of bees as animals worthy of wildlife protection. If you’re dealing with a hive or swarm on your property, the safest path, legally and ecologically, is usually to identify the species first and call in a professional before reaching for any kind of chemical solution.