Spacing out vaccines

^^This. I’ve lived all over the country and most vets generally give all at one time. Although, I’ve never had a vet who thought the strangles vaccine was worth giving (but would, as I had one boarding contract that required it initially, but never followed up on it - I didn’t).

That said, i had a mare who, at 9 years and after a move to east TX, started breaking out in hives when getting all vaccines at once, so her vaccines were staggered. Problem solved.

I have a TB gelding who has twice stopped sweating immediately after multi vaccines. Resolved gradually over a couple months both times, but it was enough to make me re-consider doing all at once.
I now have my vet give rabies when he pulls the Coggins.
Then I do West Nile, EEE/WEE and tetanus a couple weeks later, followed by PHF a couple weeks after that.
Splitting them up this way resolved the anhydrosis issue with my TB and eliminated any type of soreness from the rest.

We do 3 separate visits. flu/rhino and rabies, 4 way, and finally strangles. This year we did start vaccines the same time they had their dental work done. Nothing else gets done the day strangles is done. My vet and I have talked about options, this is what has worked so we aren’t changing it. I usually try to combine stuff with other people to split the call fee.

For both my horse’s personal vet and the farm’s vet, this depends on the horse. Older horses or those with possible immune issues have their vaccines spaced out, but there’s less concern with younger horses. The reason is that more vaccines in a day can contribute to side effects or reactions like fatigue, malaise, or soreness. My fellow has gotten low grade colic symptoms from having all his at once so I split them out as a matter of practice. Our spring and fall schedule is similar to yours.