I would think after a year old but I would call a vet or shelter to be sure. .misfits in Tavares maybe able to answer your question and they are a great facility for your needs
My vet told me my kitten had to be about 4 months old or at least 4 pounds to be safest. Make the kitten a house cat and put into a FL room or garage when going away from the house.
Kittens are ok to be neutered when they weigh around 2.5 pounds, this means approximately 2-3 months old.
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