Livestock Microchipping Laws in Colorado: What Producers Need to Know

If you raise cattle, horses, goats, sheep, or other livestock in Colorado, the question of official identification is not academic — it determines whether your animals can legally cross a state line, enter a show, or change ownership without triggering a quarantine. Microchips and RFID ear tags are both electronic identification technologies, but they are not interchangeable under Colorado and federal law.

Colorado operates under a layered system: state rules administered by the Colorado Department of Agriculture (CDA) Animal Health Division sit on top of federal Animal Disease Traceability (ADT) regulations enforced by USDA APHIS. Knowing which layer applies to your operation — and which device satisfies it — is the first step toward staying compliant.

This guide walks through every major aspect of livestock microchipping law in Colorado, from the difference between a microchip and an RFID ear tag to how you register a chip and use it as proof of ownership.

Microchipping vs. RFID Ear Tags: What Counts as Official ID in Colorado

The terms “microchip” and “RFID” are often used interchangeably in casual conversation, but they describe different form factors with different regulatory standing depending on the species involved. Both technologies use radio frequency to transmit a unique identification number, but their placement, approval status, and practical applications differ in important ways.

An RFID ear tag is an external device clipped to the animal’s ear. On November 5, 2024, new federal rules took effect requiring electronic identification ear tags for certain cattle and bison moving across state lines, replacing the old system of visual-only metal tags with RFID tags that can be read electronically. For cattle and bison specifically, the ear tag is the primary approved device.

A microchip, by contrast, is an injectable transponder implanted beneath the skin. USDA APHIS confirms that 840 Animal Identification Numbers (AINs) are available in microchip implants for equine and other species. This is a meaningful distinction: for cattle and bison, RFID ear tags are the required official ID device; for horses, cervids, camelids, sheep, and goats, an implanted microchip carrying an 840 AIN can serve as official identification.

Under Colorado regulations, “RFID” means a radio frequency identification device used as individual identification of livestock. The state’s rules reference RFID broadly, but the approved form of that device is species-dependent. For most non-cattle species, an implanted 840-series microchip satisfies the RFID requirement.

Key Insight: Colorado’s official ID framework does not treat all electronic devices equally. An ear tag approved for cattle will not substitute for a microchip implant required for equine, and vice versa. Always verify the approved device type for your specific species before purchasing identification devices.

Species	Primary Official ID Device	Microchip Implant Accepted?
Cattle and Bison	840 RFID Ear Tag (EID)	No — ear tag required
Equine (Horses, Mules, Donkeys)	840 AIN Microchip Implant or ISO-compliant chip	Yes
Sheep and Goats	Scrapie flock ID tag or 840 RFID/microchip	Yes (with Premises ID + Flock ID)
Cervids (Deer, Elk)	840 AIN Microchip Implant	Yes
Camelids (Alpacas, Llamas)	840 AIN Microchip Implant	Yes
Swine (Slaughter)	Premises Identification Number (PIN) Tag	No — PIN ear tag required

The Federal RFID Mandate and What It Means for Colorado Producers

Colorado producers operate at the intersection of state and federal identification requirements, and the 2024 federal rule changed the baseline for the entire country. The Animal Disease Traceability (ADT) Rule was enacted in January 2013 to require animals to be identified and accompanied by an Interstate Certificate of Veterinary Inspection (ICVI) or other movement document when crossing state lines.

On November 5, 2024, new federal rules took effect requiring electronic identification ear tags for certain cattle and bison moving across state lines, replacing the old system of visual-only metal tags with RFID tags that can be read electronically. The 2024 rule applies to sexually intact cattle at or over the age of 18 months; all female dairy cattle of any age; male dairy cattle born after March 11, 2013; and all cattle used for rodeo, showing, or exhibitions.

Colorado was ahead of this federal shift. Colorado, Florida, and Kentucky had their own RFID requirements predating the federal rule. That means if you were already compliant with Colorado’s state-level RFID rules, the November 2024 federal mandate likely did not require major changes to your operation.

The only EID technology approved by APHIS is an 840 tag. 900-series tags do not fulfill the requirements of this rule because they are not approved as an official means of identification. Cattle tagged with a metal tag or a plastic, non-RFID official identification tag prior to November 5, 2024, are grandfathered in.

Important Note: The federal RFID mandate has faced legal challenges. The federal RFID rule is in effect but faces an active legal challenge; the lawsuit filed by R-CALF USA and others is proceeding in the U.S. District Court for the District of South Dakota. As of June 2026, the rule remains in effect. Consult your accredited veterinarian or the CDA Animal Health Division at 303-869-9130 for the most current enforcement status.

For Colorado producers moving livestock out of state, you must also account for the destination state’s requirements. Always check both origin and destination state requirements before moving cattle. A Colorado-compliant RFID tag satisfies federal minimums, but some states impose additional requirements beyond the federal baseline.

If you are moving livestock into Colorado from another state, livestock shall also meet all of USDA’s animal disease traceability requirements. For more on the full requirements governing cross-border animal transport, see this guide on transporting livestock laws in Colorado.

Which Livestock Can Use a Microchip as Official Identification in Colorado

Not every livestock species in Colorado can use an implanted microchip as its official identification device. The answer depends on which federal program governs that species and what identification form that program authorizes.

For equine, the microchip is the standard official ID option. The 840-ID Official Microchip can be used in all equines, goats, sheep, alpaca, llama, elk, whitetail and other deer, and similar species. These animals are not subject to the cattle-specific RFID ear tag mandate, so the implanted chip is not just acceptable — it is often the preferred method.

For sheep and goats, the identification picture is more complex because of the National Scrapie Eradication Program. For sheep and goats, USDA-approved scrapie identification ear tags listing the flock of origin and individual number are required. However, producers and others who handle sheep or goats in commerce who need additional tags or want a different type may purchase official plastic, metal, or radio-frequency identification (RFID) tags directly from approved tag manufacturers. The 840-ID Microchip is an officially approved microchip, and the FDA’s Center for Veterinary Medicine also approved the 840-ID Microchip for use in sheep and goats.

For cervids such as deer and elk — a relevant category for Colorado’s substantial alternative livestock industry — injectable microchip transponders using FDX technology are approved for use in equine and deer/elk. Camelids including alpacas and llamas also fall into this category. Cattle, bison, swine, sheep, goats, poultry, equine, cervids, and camelids are all examples of species that would be registered under a premises identification number in Colorado.

Swine and poultry do not use microchip implants as official ID. Slaughter swine moving interstate use premises identification number (PIN) ear tags. Poultry identification requirements fall under flock-level programs rather than individual animal ID.

For Colorado producers who also raise backyard chickens or keep small flocks, see the related overview of backyard chicken laws in Colorado for flock-level rules that apply outside the commercial livestock framework.

When a Microchip Qualifies for Interstate Movement in Colorado

Moving livestock across state lines triggers both federal ADT requirements and the import rules of the destination state. Whether your microchip qualifies for that movement depends on the species, the chip’s AIN format, and whether you have the supporting documentation in place.

A Certificate of Veterinary Inspection (CVI) is an official document approved by the State Veterinarian and issued by an accredited veterinarian to a livestock owner prior to moving livestock across state lines. The CVI ensures that livestock have been inspected by an accredited veterinarian and found to be free from clinical signs of infectious or contagious disease. The requirement of obtaining a CVI prior to moving livestock across state lines has been an important tool in the surveillance and eradication of certain livestock diseases in the United States.

A health certificate must show the date of shipment, the names and addresses of the consignor and consignee, species of livestock, number, sex, breed, and age, and sufficient identifying brands, marks, tags, and other identification to positively identify the livestock. NAIS-compliant RFID devices must be included along with GPS coordinates when available.

For equine moving interstate, an ISO-compliant microchip satisfies the electronic identification requirement on the CVI. ISO-compliant electronic identification (such as a microchip) is accepted, and non-ISO electronic identification injected into equine on or before March 11, 2013, may also qualify depending on the receiving state’s rules.

A health certificate is void thirty days after the date of its issuance. Make sure your CVI is current before any interstate shipment, regardless of whether your animal carries a microchip or an ear tag.

Pro Tip: If you use AgView or GVL to generate your CVI electronically, the Colorado Department of Agriculture’s system receives the data in real time. AgView and GVL users do not need to obtain a separate entry permit for movement into Colorado, except when importing M-branded or rodeo cattle. This streamlines the process significantly for producers who move animals frequently.

For cattle and bison specifically, a microchip implant does not replace the RFID ear tag requirement for interstate movement. The 840 ear tag is the required device for those species. For all other microchip-eligible species, the chip number must appear on the CVI and must match the animal’s registration records. You can find additional context on cross-state animal transport requirements in this guide on transporting livestock laws in Kentucky, which illustrates how destination-state rules can add requirements beyond the federal baseline.

Approved Microchip Standards and Placement by Species in Colorado

Not every microchip on the market qualifies as official identification under USDA APHIS rules. Colorado producers must use chips that meet specific technical and numbering standards to ensure the device is readable by official scanners and traceable in the national database.

Approved devices for electronic identification include 134.2 kHz LF RFID tags compliant with both the ISO 11784 and ISO 11785 standards, or UHF RFID tags. For implantable microchips, the ISO 134.2 kHz standard is the operative requirement. Each chip must begin with the United States country code “840,” making it fully compliant with USDA-APHIS and Scrapie regulations.

APHIS does not recommend specific tag providers, but tag companies may submit specific products — encoded with a 15-digit official ID number beginning with “840,” the ISO country code for the United States — to APHIS for approval. The agency maintains a list of approved tag providers. Before purchasing chips for official use, verify the product appears on that list.

Placement standards vary by species and are set by the implanting veterinarian in accordance with APHIS guidance:

• Equine: Standard placement is in the nuchal ligament on the left side of the neck, midway between the poll and withers. This is the internationally recognized location for equine microchips and is what most scanners will check first.
• Sheep and Goats: Implants are typically placed in the ear base or the tail web, depending on the producer’s preference and the veterinarian’s recommendation. The chip number must align with the animal’s scrapie flock ID records.
• Cervids (Deer, Elk): Placement is generally in the neck or ear base. Colorado’s alternative livestock regulations require individual identification for cervids held in captivity, and an 840 microchip satisfies that requirement.
• Camelids (Alpacas, Llamas): Placement is typically in the neck. These animals are not subject to the cattle RFID ear tag rule, so the implanted chip is the standard electronic ID method.

Designed to last a lifetime, a properly placed microchip never needs replacing and provides reliable, readable identification. Microchips manufactured under strict quality standards are certified by the USDA for accuracy, durability, and readability. Have the chip implanted by an accredited veterinarian who can also record the number on your CVI and in your premises records at the same time.

Registering a Livestock Microchip in Colorado

Implanting a microchip is only the first step. For the chip to function as official identification, the number must be registered against your premises and, for sheep and goats, against your flock ID. Without that registration, the chip is a piece of glass with a number — it cannot be traced back to your operation in a disease event.

The registration process begins with your Premises Identification Number (PIN). One of the most fundamental biosecurity requirements in Colorado is premises registration. Before you can participate in animal health programs, obtain official identification tags, or request movement permits during a disease event, your location must be registered with the state.

AINs, which must be associated with an EID tag or microchip for the purposes of official animal ID, can only be distributed to a premises or entity that has either a Premises Identification Number (PIN) or Location Identifier (LID). You cannot legally order 840-series microchips for official use without one of these numbers on file.

To register your premises in Colorado:

1. Contact the CDA Animal Health Division at 303-869-9130 or email animalhealth@state.co.us.
2. Provide the name and contact information of the location owner, the physical location of the premises, livestock species housed there, and the name and contact information of the animal owner or primary caretaker.
3. Receive your PIN. A premises identification number is a unique code assigned to a physical location. Once registered, it is tied to that physical location permanently, so there is no need to obtain a new number each year or re-register.
4. If you raise sheep or goats, also obtain a Scrapie Flock ID. Goats and sheep require both a Premises ID Number and a Flock (Scrapie) ID Number. To request official sheep and goat tags or a flock/premises ID, call 1-866-USDA-Tag (866-873-2824).
5. Order your 840 microchips from an APHIS-approved manufacturer. A PIN or LID is required to order electronic ID tags or implants — a scrapie premises ID alone cannot be used.
6. Have your accredited veterinarian implant the chip and record the AIN on your CVI and in your herd health records.

The Animal Identification Management System (AIMS) is a federally managed database containing all 840 AIN tag numbers. AIMS is where unused numbers are pulled from when a tag manufacturer makes a new batch of 840 tags, and AIMS is where information is entered by people who distribute 840 tags. Your chip’s number will be traceable through this system once it is distributed and recorded against your PIN.

If you raise goats, see the detailed breakdown of goat ownership laws in Colorado for how the scrapie ID requirement intersects with broader ownership and zoning rules in the state.

Microchipping as Proof of Ownership in Colorado

In Colorado, a livestock microchip serves a dual role: it satisfies official identification requirements for movement and health programs, and it can function as evidence of ownership in disputes, theft investigations, and brand inspection scenarios. Understanding both roles helps you use the chip strategically as part of your overall records management.

Colorado’s livestock ownership framework is anchored in its brand inspection system. The Colorado Brand Inspection Division was formed by the livestock industry in approximately 1865, when Colorado was still just a territory, and became a state agency in 1903. Brands remain the primary legal proof of ownership for cattle and horses in Colorado. A microchip does not replace a registered brand for ownership purposes, but it provides an additional layer of traceable identification that brands cannot offer — especially for animals that are too young to brand or for species where branding is not standard practice.

For equine, the microchip is especially valuable as an ownership record. Horses are not subject to brand inspection in the same way cattle are, and a microchip linked to your premises ID and veterinary records creates a documented chain of custody that can be presented to law enforcement, insurance adjusters, or a court if ownership is challenged.

For sheep, goats, cervids, and camelids, the 840 microchip number tied to your PIN creates a direct link between the animal and your registered premises. In a theft or straying situation, a scan of the chip produces your premises information immediately, which Colorado animal health officials and law enforcement can use to verify ownership.

Pro Tip: Keep a written log of every microchip number you have implanted, the date of implantation, the animal’s description, and the veterinarian who performed the procedure. Keeping a written biosecurity and animal movement log as a standard practice on your operation is strongly advised. When a disease event or ownership dispute occurs, this record becomes invaluable for traceability investigations and can demonstrate your good-faith compliance efforts to regulators.

In the context of a sale or transfer, the microchip number should appear on the bill of sale alongside the animal’s description, premises ID, and any applicable brand or tattoo. This documentation creates a clear ownership trail that is difficult to dispute and easy for the CDA to verify.

If you are involved in a dispute over animal ownership or custody that extends beyond the livestock context, see the overview of pet custody laws in Colorado for how Colorado courts approach animal ownership questions more broadly. For producers who also keep companion animals alongside their livestock, dog leash laws in Colorado and animal cruelty laws in Colorado round out the regulatory picture for mixed operations.

Microchipping is not a silver bullet for ownership disputes, but combined with premises registration, a current CVI, and accurate herd records, it gives you a defensible, verifiable paper trail that aligns with both state and federal traceability requirements. That combination — not the chip alone — is what makes electronic identification genuinely useful for Colorado livestock producers.