Livestock Ear Tag Requirements in Idaho: What Every Producer Needs to Know

If you raise cattle, sheep, goats, swine, or horses in Idaho, official ear tag requirements affect your operation every time animals change hands or cross a state line. The rules are set at two levels — federal minimums under the USDA Animal Disease Traceability (ADT) program, and Idaho-specific requirements enforced by the Idaho State Department of Agriculture (ISDA). Getting both right protects your herd, keeps your paperwork clean, and prevents costly delays at auction or the state line.

A major shift took effect on November 5, 2024, when USDA mandated that newly applied official ear tags for cattle and bison must be both visually and electronically readable. That single change affects every Idaho producer who moves covered livestock across state borders. This guide walks you through which animals need tags, what tags now qualify, where to get them, how to apply them, and what records you must keep.

Important Note: As of June 2026, litigation challenging the November 2024 RFID rule remains active in federal court. The rule is currently in effect and enforceable. Contact the Idaho State Department of Agriculture or USDA APHIS for the latest status before any interstate shipment.

Which Animals Require Official Ear Tags in Idaho

The 2013 USDA “Traceability for Livestock Moving Interstate” rule established minimum animal ID and documentation requirements for the interstate travel of cattle and bison; sheep and goats; swine; horses and other equines; captive cervids such as deer and elk; and poultry. Idaho follows these federal minimums and enforces them through the ISDA.

The ISDA provides information on identification requirements for cattle under the USDA Animal Disease Traceability program, with the latest changes effective November 5, 2024. The ADT program defines official animal identification and sets the recording requirements for the interstate movement of animals.

The following categories of cattle require individual official identification when being recorded on any federal form or moving interstate in Idaho:

• Sexually intact beef cattle and bison 18 months of age or older
• All dairy cattle, regardless of age or sex
• Cattle and bison of any age used for rodeo or recreational events
• Cattle and bison of any age used for shows or exhibitions
• Animals required to be officially identified under any federal disease program, such as brucellosis or tuberculosis

Cattle and bison under 18 months of age and cattle and bison going directly to slaughter are exempt from the requirements for official identification. Animals that would otherwise require identification may go directly to an approved tagging site without having any identification present. They may also go directly to an approved slaughter facility, to be slaughtered within 3 days, with a USDA-approved backtag in lieu of other identification.

For species other than cattle and bison, each covered species has its own animal ID devices, methods, and requirements. Sheep and goats, swine, horses, and captive cervids all fall under separate species-specific rules covered in detail below.

Pro Tip: If you are unsure whether your animals require official ID, contact the ISDA Animal Industries division before moving them. Applying the wrong tag — or no tag — can restrict who can legally purchase your animals at auction.

Federal RFID Ear Tag Rule: What Changed in November 2024

On November 5, 2024, new federal rules took effect requiring electronic identification (EID) ear tags for certain cattle and bison moving across state lines. The rule, published by USDA APHIS, replaces the old system of visual-only metal tags with radio frequency identification (RFID) tags that can be read electronically.

USDA amended the animal disease traceability regulations to require that eartags applied on or after a date 180 days after publication in the Federal Register be both visually and electronically readable in order to be recognized for use as official eartags for interstate movement of cattle and bison covered under the regulations. USDA published the final rule on May 9, 2024, making the effective date November 5, 2024.

The rule changes what counts as official ID, not when official ID is needed. The rules regarding what animals need to be identified, and when, did not change. In practical terms, if your cattle were already tagged with a visual-only metal or plastic official tag before the cutoff date, you do not need to retag them.

Cattle tagged with a metal tag or a plastic, non-RFID official identification tag prior to that date are grandfathered in. Cattle tagged with visual-only official tags prior to November 5, 2024, do not need to be retagged unless they lose their ID.

The purpose of this rule is to improve livestock traceability. Electronic identification tags and systems provide many advantages over traditional metal tags, including faster information sharing, more accurate and precise identification of animals, and significantly faster record searches during disease outbreaks.

Before APHIS finalized the rule, Congress approved funding to help producers voluntarily obtain EID tags. The Consolidated Appropriations Act passed in March 2024 allocated $15 million for EID tags. Contact the ISDA or your state veterinarian’s office to ask about the availability of no-cost RFID tags in Idaho.

Official 840 RFID Ear Tag Requirements in Idaho

A unique 15-digit number beginning with 840 designates the USA as the animal’s country of origin. Recognized by state and federal agencies and the livestock industry, official USDA 840 ear tags provide a source of animal identification to trace movement and contact points in the event of an animal disease outbreak.

Official EID tags are USDA-approved official tags that have a visible 15-digit number starting with 840 printed on them that matches the electronic chip inside the tag, are stamped with the US shield, and say “unlawful to remove.” Other identification types, such as trichomoniasis testing tags, freeze brands, registration tattoos, farm/ranch tags, or RFIDs using numbers beginning with anything other than 840 are not considered official identification.

Currently, the only EID technology approved by APHIS is an 840 tag. This requirement applies to official identification placed for any reason, including interstate movement, brucellosis vaccination, and tuberculosis testing.

Two-piece tag sets are common. Imprinting the AIN on Tag Piece A — the piece attached to the inside of the ear — is required; imprinting the AIN on Tag Piece B is optional. When the AIN is imprinted on Tag Piece B, the tag set is packaged in containers or trays to keep both tag pieces together as a pair. Tags with RFID technology must have all 15 digits of the AIN printed on the tag piece that contains the transponder. The official ear tag shield and the text “Unlawful to Remove” must be printed on the other piece.

Before you can order 840 tags, you need a Premises Identification Number (PIN). To obtain AIN tags, a producer must first register their premises and obtain a premise ID number from their state animal health authority; a premise ID number is required for ordering. You can register for a PIN through the ISDA’s Animal Industries division.

Pro Tip: Your PIN is permanently tied to the physical address of your operation. If you move your herd to a different location — even temporarily for grazing — confirm with ISDA whether that location requires its own PIN before ordering tags.

Species-Specific Ear Tag Rules in Idaho

The November 2024 RFID mandate applies only to cattle and bison. Every other covered species in Idaho follows its own identification standard under the federal ADT framework and applicable disease program regulations.

Sheep and Goats

Sheep and goats that are required to be officially identified for interstate movement must be identified by a device or method authorized by Part 79 of the Code of Federal Regulations. The scrapie eradication program drives most sheep and goat ID requirements. Official identification for sheep and goats typically includes approved USDA scrapie ear tags, which carry a flock identification number and a unique animal number. Consult the ISDA for the current approved tag list and any Idaho-specific additions.

Swine

Swine that are required to be officially identified for interstate movement must be identified by a device or method authorized by § 71.19 of the Code of Federal Regulations. Approved methods for swine include ear tags, ear notches, and tattoos, depending on the purpose of movement. Idaho producers moving swine interstate should confirm current approved methods with the ISDA before shipment.

Horses and Other Equines

Horses and other equines moving interstate can be officially identified using a digital photograph or written description of the animal. Every animal entering Idaho requires a Certificate of Veterinary Inspection (CVI). Some require an entry permit. If you move horses regularly between Idaho and a neighboring state for ranch work, ask the ISDA about working horse permit options that may reduce CVI requirements.

Captive Cervids

Captive cervids that are required to be officially identified for interstate movement must be identified by a device or method authorized by Part 77 of the Code of Federal Regulations. Captive deer and elk in Idaho are also subject to Idaho Department of Fish and Game regulations in addition to ISDA requirements. Contact both agencies before moving captive cervids across state lines.

Where to Get Official Ear Tags in Idaho

You have several options for sourcing official 840 RFID ear tags in Idaho. The right channel depends on your herd size, budget, and how quickly you need tags.

ISDA and State Veterinarian Programs

Many state veterinarian offices distribute free 840 RFID tags to producers, but supply has been uneven. Contact the ISDA Animal Industries division directly to ask whether no-cost tags are currently available in Idaho. When free tags are in stock, you will need your PIN to place an order.

Approved Manufacturers and Distributors

Three major manufacturers produce approved 840 tags: Allflex (Dallas, TX), Datamars (Temple, TX), and Y-Tex (Cody, WY). Tags are available through veterinary supply distributors, farm supply stores, and directly from manufacturers. Only approved AIN tag manufacturers, AIN tag managers, or AIN tag resellers can provide AIN tags.

Veterinarians

If you are a veterinarian needing to order tags, RFIDs can be ordered through any ear tag distributor. Many Idaho livestock veterinarians keep a supply of 840 RFID tags on hand and can apply them at the time of a herd health visit or pre-movement examination. This is especially useful for animals arriving at auction without proper identification.

Cost Expectations

RFID 840 tags cost between $2 and $5 per tag, depending on the manufacturer, tag style, and order quantity. For comparison, traditional visual-only metal tags cost $0.10 to $0.25 each and were often provided free by USDA through state veterinarian offices. Factor this cost into your per-head expenses when budgeting for replacement breeding stock or show animals.

How and When to Apply Ear Tags in Idaho

Proper tag placement protects the animal and keeps the tag readable for its lifetime. USDA and industry guidance are consistent on technique.

USDA prefers producers apply ear tags in the left ear, leaving the right ear for official use. All ear tags should be placed two-thirds of the way from the outside edge of the ear, and one-third of the way from the head between the middle two cartilage ribs. Placing tags outside this zone increases the risk of tearing and tag loss.

For brucellosis vaccination, the right ear is reserved for official use. The new official brucellosis identification is an orange RFID button, placed in the right ear by the herd veterinarian at the time of vaccination. Do not place farm management tags in the right ear if your animals will be vaccinated, as this can create confusion during official inspections.

Regarding timing, tag animals before any interstate movement, before recording them on any federal form, and at the time of brucellosis vaccination or tuberculosis testing. Animals that would otherwise require identification may go directly to an approved tagging site without having any identification present — but this option is limited and requires advance coordination. Do not count on tagging at the auction barn as a routine practice.

Tag applicators are manufacturer-specific. Tag applicators are specific to each manufacturer. Confirm you have the correct applicator for your tag brand before processing a group of animals. Using the wrong applicator can damage the RFID transponder and render the tag unreadable.

Pro Tip: Clean the applicator and tag site with an antiseptic solution before and after each animal. This reduces infection risk and improves tag retention — especially important in Idaho’s dusty summer conditions during branding and weaning seasons.

Ear Tag Requirements for Interstate Movement in Idaho

Moving livestock out of Idaho — or bringing animals in — triggers both federal ADT requirements and Idaho-specific entry rules. You need to satisfy both sets of requirements simultaneously.

Unless specifically exempted, livestock traveling over a state border must be officially identified and accompanied by an interstate certificate of veterinary inspection (ICVI) or other documentation. Every animal entering Idaho requires a Certificate of Veterinary Inspection (CVI).

Cattle and bison moved interstate must be accompanied by an ICVI unless they are moved directly to a recognized slaughtering establishment, or directly to an approved livestock facility and then directly to a recognized slaughtering establishment, and they are accompanied by an owner-shipper statement.

Idaho also enforces disease-specific movement requirements. A federal order is in effect regarding the interstate movement of lactating dairy cattle and H5N1/Bovine Influenza A Virus. This order enacts testing requirements for the movement of lactating dairy cattle from a currently affected state. For these movements, the CVI must state lactation status, and up to 30 head of lactating cattle from each shipment require a negative H5N1 test within 7 days before entry.

For producers with herds that graze across state lines seasonally, commuter herd agreements are an option. Under a commuter herd agreement between a livestock owner and state or tribal animal health officials, cattle and bison may be moved interstate between two premises, without a change of ownership in the course of normal livestock operations, subject to the conditions of the agreement. Contact the ISDA to apply for a commuter herd agreement if this describes your operation.

Before shipping, verify entry requirements for your destination state. It is important to verify entry requirements of the destination state before moving livestock and poultry in order to ensure that shipments comply with interstate movement laws and regulations. Requirements vary significantly between states, and some destinations require permits in addition to a CVI.

For more on Idaho’s transporting livestock laws and the livestock trailer requirements in Idaho that apply to any interstate shipment, review those requirements before you load.

Animal Category	Official ID Required for Interstate Movement?	Approved ID Type (as of Nov. 2024)	CVI Required?
Sexually intact beef cattle/bison ≥18 months	Yes	840 RFID ear tag	Yes
All dairy cattle (any age)	Yes	840 RFID ear tag	Yes
Cattle/bison used for rodeo, shows, or exhibitions	Yes	840 RFID ear tag	Yes
Beef feeder cattle under 18 months (no show/disease program)	Generally exempt	N/A (check destination state)	Yes
Cattle/bison going directly to slaughter	Exempt (backtag acceptable)	USDA backtag	Owner-shipper statement acceptable
Sheep and goats	Yes (scrapie program)	USDA scrapie tag (Part 79)	Yes
Swine	Yes	Ear tag, notch, or tattoo (§ 71.19)	Yes
Horses and equines	Yes	Photo or written description	Yes (permit may be required)
Captive cervids	Yes	Device per Part 77	Yes

If you move livestock to neighboring states, the same official ID rules apply in both directions. See related guides on livestock trailer requirements in Nevada, livestock trailer requirements in Oregon, and livestock trailer requirements in Wyoming for transport compliance in states that border Idaho.

Recordkeeping Requirements for Ear-Tagged Animals in Idaho

Official ear tags are only as useful as the records behind them. Federal regulations set minimum retention periods, and Idaho producers must meet these standards to remain compliant with the ADT program.

Distribution Records

Section 86.3 addresses recordkeeping requirements for official identification. Any state, tribe, accredited veterinarian, or other person or entity who distributes official identification devices must maintain for 5 years a record of the names and addresses of anyone to whom the devices were distributed. Official identification device distribution records must be entered by the person distributing the devices into the tribal, state, or federal databases designated by APHIS.

Veterinarian Records

Records of official identification devices applied by a federally accredited veterinarian to a client animal must be kept in a readily accessible record system. If your herd veterinarian applies tags during a farm visit or at a market, they are responsible for entering those records. Ask for a copy for your own files.

Interstate Movement Documents

Approved livestock facilities must keep any ICVIs or alternate documentation required for the interstate movement of covered livestock. For poultry and swine, such documents must be kept for at least 2 years, and for cattle and bison, sheep and goats, cervids, and equine species, 5 years.

What to Record for Each Tagged Animal

At a minimum, your farm records for each officially tagged animal should include:

• The animal’s full 15-digit AIN from the 840 tag
• The date the tag was applied
• The name and PIN of the premises where the tag was applied
• The species and a brief description of the animal
• Any interstate movement dates, destination premises, and accompanying CVI numbers
• Dates and results of any official disease tests tied to that AIN

Increasingly, these records are maintained in electronic information systems rather than on paper, making the recordkeeping requirement less burdensome. Several livestock management software platforms allow you to scan 840 RFID tags directly into a digital record, reducing transcription errors and making records easy to retrieve during a disease investigation.

Pro Tip: Keep a backup copy of all tag distribution and movement records in a cloud-based system or off-site location. In the event of a disease investigation, APHIS and ISDA officials may need access to your records quickly, and paper files stored in a barn are vulnerable to fire, flood, and water damage.

Staying current on Idaho’s ear tag and traceability rules is an ongoing responsibility, not a one-time task. Regulations at both the federal and state level can change, as the November 2024 RFID mandate demonstrated. Bookmark the ISDA cattle identification page and check it before any significant movement or purchase. If you have questions specific to your operation, contact the ISDA Animal Industries division at (208) 332-8540 or reach out to your accredited veterinarian.

For producers who also need to understand transport compliance across other states, the following guides cover trailer and transport rules in key cattle-moving states: Colorado, Kansas, Oklahoma, and Missouri.