Spring or early summer – the traditional time of year to give annual boosters. Depending on where you live, however, you’ll adjust the time to fit the arrival of insects that are the vectors that carry disease. Here, at 7,000 feet in the foothills of the Rockies, we rarely have mosquitoes and our stable-fly season doesn’t start until late summer. But in early spring we have our highest incidence of ticks, and we have a brief but intense horse-fly season. So, to be on the safe side, I usually vaccinate in May or June. Confer with your vet as to which vaccines are necessary for your locale and your horses and when is the best time to immunize them.
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