Owning a Venomous Snake in Montana: What the Law Actually Allows

Montana’s wide-open landscapes and rich wildlife heritage attract plenty of reptile enthusiasts, and it is natural to wonder whether keeping a venomous snake is a realistic option in the state. The short answer is nuanced: it depends heavily on whether the snake is native or exotic, where you live, and whether you can navigate a permit process that many describe as exceptionally difficult.

Before you pursue ownership, understanding the full legal picture — from state statutes and administrative rules to county and city ordinances — is essential. This guide walks you through each layer of Montana’s framework so you can make an informed, legally sound decision.

Is It Legal to Own a Venomous Snake in Montana

The legality of owning a venomous snake in Montana is not a simple yes or no. Montana regulates wildlife possession primarily through Title 87, Chapter 5 of the Montana Code Annotated (MCA), which governs the importation, possession, and sale of exotic wildlife. The law draws a firm line between native species and non-native exotic ones, and venomous snakes fall under some of the strictest scrutiny in the entire classification system.

Venomous snakes and large constrictor snakes are banned in Montana because of their potential threat to humans and ecosystems. The Administrative Rules of Montana (ARM) provide detailed guidance on prohibited species to ensure clarity for residents and law enforcement.

That said, the prohibition is not absolute for every venomous species. Native venomous snakes occupy a different legal category than non-native exotic ones, and that distinction matters enormously when you are trying to understand what is and is not allowed.

Important Note: Montana’s exotic wildlife statutes were amended by Laws 2025, ch. 50, effective March 1, 2026. Always verify the current version of MCA 87-5-701 through 87-5-721 and ARM 12.6.2201 through 12.6.2230 directly with Montana Fish, Wildlife & Parks before acting on any legal interpretation.

If you are curious about the broader world of venomous reptiles, it helps to first understand the distinction between venomous and poisonous snakes and to explore the different types of snake venom to appreciate why these animals are treated with such regulatory caution.

Native vs. Exotic Venomous Snakes: How Montana Treats Them Differently

Montana’s legal framework creates two very different pathways depending on whether the venomous snake you want to keep is native to the state or was born elsewhere. This distinction is the single most important factor in determining what is legally possible for you.

Native Venomous Snakes

Montana is home to one venomous snake species: the prairie rattlesnake (Crotalus viridis). You can read more about the types of snakes found in Montana and when snakes are most active in the state to get a sense of the local herpetofauna. Under Montana law, native wildlife that is not listed as prohibited or controlled occupies a somewhat different regulatory space than exotic species. Native venomous snakes such as Crotalus viridis are not protected and can be held by private individuals in any municipality in which it is legal to do so.

However, this does not mean possession is entirely unrestricted. You still need to comply with any applicable local ordinances, and you cannot collect wild prairie rattlesnakes without regard for other wildlife regulations. Keeping one you have lawfully obtained is the key distinction.

Exotic Venomous Snakes

Non-native venomous snakes face a much higher legal barrier. Under Montana’s administrative rules, pit vipers and true vipers — all species in the family Viperidae except those indigenous to Montana — are classified as a prohibited or controlled exotic species. This covers an enormous range of popular reptile-keeping species, including cobras, mambas, gaboon vipers, green mambas, and similar animals.

Montana’s noncontrolled exotic wildlife list explicitly authorizes only nonnative tropical and subtropical species of nonvenomous snakes that are not on the controlled or prohibited lists. Venomous species are conspicuously absent from that permitted list, which tells you a great deal about how the state views them.

Key Insight: The prairie rattlesnake is Montana’s only native venomous snake. Every other venomous species you might consider keeping — from king cobras to bush vipers — is non-native and subject to far stricter exotic wildlife controls.

For a broader perspective on venomous snakes found across the region and continent, see our guides on the most venomous snakes in North America and the most venomous snakes in the US.

Permit Requirements for Owning a Venomous Snake in Montana

Whether a permit is even available to you depends on which category the snake falls into under Montana’s three-tier classification system: noncontrolled, controlled, or prohibited. Venomous snakes generally land in the controlled or prohibited tiers, each with its own permitting implications.

The Three-Tier Classification System

• Noncontrolled species — A noncontrolled species may be possessed, sold, purchased, or exchanged in the state without a permit, except as provided in the ARM or in Montana statutes or federal statutes. Venomous snakes are not on this list.
• Controlled species — Controlled exotic wildlife means species placed on the controlled exotic wildlife list under MCA 87-5-707 that may be imported, possessed, or sold only pursuant to commission and department rules and an authorization permit.
• Prohibited species — Prohibited exotic wildlife means animal species placed on the list that may not be imported, possessed, or sold. Many non-native venomous snakes fall here.

Applying for a Controlled Species Permit

If the species you want is classified as controlled rather than outright prohibited, you must apply through Montana Fish, Wildlife & Parks (FWP). The department assesses a fee of $25 to obtain or renew a permit to possess a controlled species, and the permit must be renewed annually. Renewal is contingent upon submission of the annual fee plus any required reporting of current inventory and any changes to inventory during the preceding year.

You must submit an annual report to Montana Fish, Wildlife & Parks between January 1 and January 15 each year indicating controlled exotic wildlife currently in your possession and any transactions that have taken place, such as births, deaths, acquisitions, and sales, since the last annual report. Annual renewal of your license will not be completed unless the annual report, along with any permit fee, is submitted to the department prior to November 15.

How Difficult Are These Permits to Obtain?

Even where a permit pathway technically exists, the practical reality is sobering. In Montana, no exotic venomous snakes are allowed without special permits issued by the state, which are reported to be few and far between — meaning they virtually do not exist for private keepers.

For those seeking to own animals requiring permits, Montana has a thorough application process to ensure responsible ownership. Applicants must submit a detailed plan to the Montana Fish, Wildlife & Parks department, demonstrating their ability to meet the animal’s needs, including secure housing, proper nutrition, and veterinary care.

The plan must address public safety and environmental risks, outlining measures to prevent escape and protocols for emergencies. A background check may be required to ensure the applicant has no history of animal abuse or wildlife law violations. The FWP reviews the application and may conduct site inspections to verify the adequacy of facilities.

Pro Tip: Contact Montana Fish, Wildlife & Parks directly before investing time in a permit application for any exotic venomous species. Staff can tell you whether the specific species you are interested in is classified as controlled or outright prohibited — a distinction that determines whether a permit is even theoretically possible.

Housing, Enclosure, and Safety Requirements in Montana

If you are pursuing a permit for a controlled venomous species, or if you are keeping a native prairie rattlesnake lawfully, Montana’s administrative rules set baseline expectations for how the animal must be housed. These standards exist under ARM 12.6.2203 and 12.6.2204 and are designed to protect both the public and native wildlife.

General Care and Humane Treatment

Exotic wildlife held in captivity must be treated in a humane manner and cannot be restrained with a chain, rope, or other holding device except when necessary to provide appropriate care.

Enclosure Security Standards

Although Montana’s ARM does not publish the same granular enclosure specifications as some other states, the general framework requires escape-proof containment. As a practical benchmark, standards used in other jurisdictions for medically significant venomous reptiles — which Montana’s framework references — typically require the following:

• Enclosures manufactured or constructed to prevent any possibility of escape
• Doors, lids, or access features that are securely latched or locked at all times
• Rooms housing venomous reptiles that are locked when unoccupied
• Clear labeling identifying the species and number of animals inside

Recordkeeping Requirements

Permit holders must maintain detailed records of every animal in their care. The department may require additional conditions on a permit to protect Montana’s native wildlife and plant species, livestock, and human health and safety. Permit conditions may include individual identification of animals, and a person must comply with all permit conditions in order to receive or retain a permit.

You must submit an annual report to Montana Fish, Wildlife & Parks between January 1 and January 15 each year indicating controlled exotic wildlife currently in your possession and any transactions that have taken place.

Injury and Escape Reporting

You are required to report injuries inflicted by the exotic species on Montana wildlife to the department within 24 hours of the infliction of the injury. Escape events must also be reported promptly, and you are expected to immediately initiate efforts to recapture any escaped animal.

Understanding the medical stakes involved is part of responsible ownership. Our guide on snakebite envenoming covers what happens during a venomous bite and why rapid response matters. You may also want to review information on animals that are immune to snake venom for broader biological context.

Local Laws That May Apply in Montana

State law is only one layer of the legal framework. Montana allows cities and counties to pass their own ordinances, and those local rules can be more restrictive than state law — even if the state permits something in principle.

It may not be legal to keep venomous reptiles where you live. Many states and a growing number of cities and counties have laws regulating the possession and sale of venomous reptiles. Montana is no exception to this trend.

Montana’s administrative rules explicitly state that the noncontrolled species designation does not authorize the sale, possession, transportation, importation, or exportation of a species in violation of any applicable federal or state statute or regulation or county or city ordinance. In other words, even if a species is permissible at the state level, a local ordinance can override that and prohibit it entirely within a city or county’s jurisdiction.

Cities such as Billings, Missoula, Great Falls, Bozeman, and Helena each maintain their own municipal codes. Under Montana law, city or town councils may impose fines and penalties for the violation of any city ordinance, with fines up to $500 and imprisonment up to 6 months for any one offense.

Common Mistake: Assuming that because Montana’s state law does not explicitly ban native venomous snakes for private possession, your city or county is also silent on the matter. Always check your specific municipality’s animal control or exotic animal ordinances before acquiring any venomous snake.

You should contact your local city or county government directly to ask whether any ordinance restricts or prohibits venomous reptile possession at the local level. Do not rely solely on state-level research when making this determination.

It is also worth noting that federal law adds another layer. The Lacey Act makes it illegal for a person to import, export, transport, sell, receive, acquire, or purchase in interstate or foreign commerce fish or wildlife taken, possessed, transported, or sold in violation of a state law, state regulation, or foreign law. This means that even acquiring a venomous snake from out of state could expose you to federal liability if any step in the chain violated another state’s law.

Penalties for Illegally Owning a Venomous Snake in Montana

Montana takes violations of its exotic wildlife statutes seriously. If you possess a venomous snake without the required permit — or possess a prohibited species entirely — you face consequences at multiple levels.

State-Level Penalties Under MCA Title 87, Chapter 5

Possessing illegal pets in Montana carries significant legal consequences under MCA Title 87, Chapter 5. Penalties include fines, animal forfeiture, and imprisonment. Fines can reach up to $1,000 per illegal animal, reflecting the potential harm to ecosystems and public safety. Restitution costs for capturing, caring for, or relocating the animals may also be imposed.

Any false statement made in a permit application carries its own criminal exposure. A false statement in a permit application may subject you to the criminal penalties of MCA 87-5-721.

Permit Revocation and Suspension

If you hold a permit and fall out of compliance, the consequences extend beyond fines. The department may suspend or cancel a permit if the permittee violates or fails to comply with a permit condition, or is convicted of violating a federal or state law or county or city ordinance associated with possession of the exotic wildlife species. The department may also amend, suspend, or cancel a permit if necessary to protect native wildlife, livestock, public health, public safety, or the environment.

Animal Forfeiture

Beyond fines and possible imprisonment, you face the loss of the animal itself. Montana authorities can seize any venomous snake found to be in illegal possession, and the costs of that seizure — including capture, care, transport, and relocation — may be billed back to you as restitution.

Important Note: The consequences of illegal possession are not limited to a fine. Between forfeiture, restitution, possible criminal charges, and the loss of any future permit eligibility, the legal and financial exposure is substantial. If you are uncertain about your situation, consult an attorney familiar with Montana wildlife law before acquiring any venomous snake.

Understanding the broader context of venomous snakes — including the most venomous snakes in the world and what makes them medically significant — can help you appreciate why regulators treat these animals with such caution. For comparison, you can also explore how other states approach the issue by reading about venomous snakes in Florida and venomous snakes in Georgia, two states with their own distinct regulatory frameworks.

Montana’s approach is ultimately one of caution and conservation. The state’s legal framework reflects a deliberate effort to protect both its native ecosystems and its residents from the risks that venomous snakes can pose. If you are genuinely interested in keeping venomous reptiles, your most productive first step is a direct conversation with Montana Fish, Wildlife & Parks — followed by a review of your local ordinances — before making any decisions.