Horse vaccinations fall into two groups under the guidelines of the American Association of Equine Practitioners (AAEP): core vaccines for every horse, and risk-based vaccines that depend on where your horse lives, travels and who it meets. The four core vaccines protect against tetanus, rabies, West Nile virus and Eastern/Western equine encephalomyelitis (EEE/WEE). Your veterinarian decides which other vaccines your horse needs and sets the schedule, so use this guide to understand the framework and to ask better questions.
Key takeaways
- AAEP core vaccines: tetanus, rabies, West Nile virus and EEE/WEE.
- Risk-based vaccines depend on location, travel, age and breeding status.
- Core boosters are usually yearly; mosquito-borne ones come before mosquito season.
- Your veterinarian sets the program for each horse.
- 424 of 554 listed equine vets say they travel to the client.
Find equine vets near youPrices checked on each business's own website.
What kind of vaccinations do horses need?
So what vaccinations does a horse need? Every horse needs the core vaccines, plus any risk-based vaccines its situation calls for. The AAEP defines core vaccines as those that protect against diseases that are endemic to a region, highly contagious, a risk of severe disease or of public health significance, with clearly demonstrated efficacy and safety. Risk-based vaccines are chosen after a risk assessment performed by, or with, a licensed veterinarian, so they vary between horses, barns and regions.
Core vaccines
For every horse, wherever it lives and whatever it does.
- Tetanus
- Rabies
- West Nile virus
- EEE/WEE (Eastern/Western equine encephalomyelitis)
Risk-based vaccines
Added by your vet after a risk assessment.
- Depend on location, travel, age and breeding status
- The AAEP lists 11, including influenza, strangles and equine herpesvirus
- Not every horse needs every one
Two points from the AAEP framework matter most to owners. First, disease risk is not always obvious to someone without veterinary training, so the AAEP puts the program in the hands of the attending veterinarian, working within a veterinarian-client-patient relationship. Second, the list is not a menu: Penn State Extension advises against giving every vaccine available, because that can be costly and unnecessary.
You may hear a “5 way” or similar combination shot mentioned at the barn. Ask your vet which diseases that shot covers and whether they match the core list and your horse’s risk-based needs.
What are the core horse vaccines, and why?
Each core vaccine covers a disease that veterinarians consider serious and widespread enough to justify vaccinating essentially every horse. Oklahoma State University Extension describes how each one reaches a horse.
| Core vaccine | How the disease reaches a horse | Why it is core |
|---|---|---|
| Tetanus | Soil organism entering a wound, even a small puncture | Horses are particularly sensitive, and the disease is often fatal |
| Rabies | Saliva of an infected mammal, through a bite wound | On the AAEP core list; many vets also advise current rabies vaccination for farm dogs and cats |
| West Nile virus | Biting insects, mainly mosquitoes | All horses are at risk, whether boarded, competing or kept on large acreage without other horses |
| EEE/WEE | Biting insects, mainly mosquitoes | Same exposure as West Nile virus: all horses are at risk |
Tip: If you buy a horse with no tetanus vaccination history, Oklahoma State University Extension says to talk to your veterinarian about protection. It also advises keeping any incoming horse away from the rest of your herd for at least four weeks.
Which risk-based vaccines might a horse need?
The AAEP lists 11 risk-based vaccines: anthrax, botulism, equine herpesvirus, equine influenza, equine viral arteritis (EVA), leptospirosis, Potomac horse fever, rotaviral diarrhea, snake bite, strangles and Venezuelan equine encephalomyelitis (VEE). Extension guidance ties several of them to specific situations. The table gives examples from Oklahoma State University Extension.
| Risk-based vaccine | What can raise the need |
|---|---|
| Strangles | Spreads by direct contact and shared items such as troughs, hoses, tack and trailers; suits premises where it keeps recurring or horses at high risk |
| Equine influenza | Age under five, and frequent contact with many horses, as at shows |
| Equine herpesvirus | Pregnant mares, plus young, show and performance horses at high risk of exposure |
| Equine viral arteritis | Breeding, including carrier stallions and shipped semen |
| Potomac horse fever | A seasonal disease, late spring to early fall, once confirmed on a farm or in an area |
| Anthrax | Limited geographic areas; horses pastured in prevalent areas |
| Snake bite | Certain areas of North America, or travel to them |
Questions about the strangles vaccine come up often because the disease passes through contact and shared equipment. Young horses are commonly affected, though horses of any age can be infected, according to the same extension fact sheet. Whether your horse should have it is a risk decision for your vet.
Your veterinarian weighs factors such as:
- Risk of exposure where the horse lives, including contact with other horses
- History of disease on the farm
- Age and overall health
- Breeding status
- Travel and show plans
- Potential for adverse reactions
Watch out: Extra vaccines are not extra safety. Penn State Extension says giving every vaccine available can be costly and unnecessary, so let your vet match the shots to your horse’s real risk.
How often should horses have vaccinations?
Previously vaccinated adult horses generally get their core vaccines once a year. Penn State Extension describes core vaccines as ones every horse should receive every year, and the AAEP adult horse chart lists annual revaccination for these horses.
Timing within the year matters for the mosquito-borne diseases. The AAEP chart places West Nile virus and EEE/WEE vaccination before the start of the vector season, and Penn State Extension says to give them before mosquito season, which is why many owners book spring appointments. Horse annual vaccinations for those two diseases therefore follow local weather, not only a calendar date.
Some horses may need more than one visit a year. The AAEP chart says a vet may consider a six-month interval for West Nile virus and EEE/WEE where mosquito seasons run long, and for EEE/WEE in horses under five. Risk-based vaccines have their own timing, which your vet sets around travel and exposure.
A horse with no vaccination history, or an unknown one, usually starts with an initial series rather than a single yearly shot. Guidelines also differ for broodmares and foals. Penn State Extension adds that protection can take several weeks to build after a vaccine, so plan around mosquito season and travel dates.
The year looks like this when your vet runs it:
- Check records
- Vet risk review
- Core shots before mosquito season
- Risk-based shots timed to travel
- Update records
How do you plan a horse vaccination schedule with your vet?
A written schedule beats memory. Use these steps to build one with your veterinarian, who makes the medical decisions at each step.
- Gather your horse’s history
Collect past vaccination dates and note any reaction to a vaccine. If the history is unknown, tell your vet.
- Describe your horse’s life
Where it lives, how often it travels or shows, whether new horses arrive at the barn, its age and any breeding plans.
- Let your vet set the program
Ask which core and risk-based vaccines apply, why, and when each is due, including before mosquito season and trips.
- Put the dates in writing
Ask for the vaccines and dates in your horse’s record, and set a reminder for the next round.
Bring these questions to the appointment:
- Which core vaccines is your horse due for, and when?
- Which risk-based vaccines fit your horse’s travel, age and barn?
- Does the plan change for a broodmare, a foal or an older horse?
- Do the barn’s rules on vaccination proof or quarantine for new arrivals change anything?
- What should you watch for after the visit, and when should you call the clinic?
- What will the visit cost, including any farm call fee?
A Coggins test is a separate topic from vaccination; see our guide to the Coggins test.
Can I give horse vaccines myself?
Ask your veterinarian before you buy or give any vaccine. The AAEP says vaccines are safest and most effective when your veterinarian administers them, and this guide gives no injection instructions.
The AAEP explains why. A vet builds a protocol around the horse’s individual risk level, and storage matters: vaccines should be kept in the dark at 35 to 45 F and not frozen, and damage most often comes from heat, light or freezing. Ignoring label directions can lead to lack of effectiveness, vaccine failure and more local reactions.
Watch out: The AAEP notes that vaccine companies generally get involved, and often cover treatment and diagnostic costs, when a veterinarian gave the vaccine, because they trust storage and administration were done correctly. That is not the case when a layperson gave it.
A horse’s condition also affects how well it responds. The AAEP says heavily parasitized or malnourished horses, stressed horses and older horses, especially those with Cushing’s disease, may respond less well to vaccination. Your vet can judge that; a product label cannot.
Can you buy horse vaccines at Tractor Supply?
Barnmap cannot confirm what any store stocks, and the AAEP article on veterinarian-administered vaccines does not discuss retail purchases. What it does say is that vaccines are safest and most effective when your veterinarian gives them, and that manufacturer support depends on who gave the vaccine. Before buying vaccines anywhere, ask your vet which ones your horse needs and who should give them.
How do you find an equine vet for horse vaccinations?
Start with the vet your barn already uses, if there is one, and ask your barn manager who that is. To compare other options, Barnmap lists 554 equine vets in 47 states. These counts are what the establishments publish on their own websites, as listed on Barnmap as of October 2026, so confirm details with the clinic.
About 3 in 4 of the listed vets (424 of 554) say they travel to the client, which can make a barn-side visit easier to arrange. The chart shows the 12 states with the most listed vets, out of 47 states in all.
Only 15 of the 554 list a price on their own websites, so ask for an estimate when you book: which vaccines are included, and whether a visit fee applies on top. Browse equine vets across the country on Barnmap’s equine vets page, or by state, starting with the states with the most listings: California, Texas, Florida, Virginia, Oregon, Washington, North Carolina, Colorado, New York, Pennsylvania, Oklahoma and Ohio. Other states are on the national page. For a shortlist, see Barnmap Picks, and read our equine vet guide for what to expect from a practice.
Sources
- Equine Vaccination Guidelines, American Association of Equine Practitioners
- Vaccinations for Adult Horses (Adult Horse Vaccine Chart, 2026), American Association of Equine Practitioners
- The Science Behind Veterinarian-Administered Vaccines, American Association of Equine Practitioners
- Vaccines for Your Horse, Penn State Extension
- Preventive Medicine Programs for Horses: Equine Vaccination Programs (VTMD-9119), Oklahoma Cooperative Extension Service, Oklahoma State University
This guide is general information for horse owners, not veterinary or legal advice. Prices come from what establishments publish on their own websites, as listed on Barnmap on the date shown. How we check