The answer to 'when to treat for centipede' is that the best time to treat for centipedes is in the spring and fall when they are most active. Centipedes thrive in moist, dark environments and typically come indoors to escape the heat or cold. The spring and fall are when they are most likely to be found in and around your home, making these the ideal times to apply pest control treatments.
Centipedes can be a nuisance as they can deliver a painful bite, so it's important to stay on top of controlling them. Treating in the spring and fall will help prevent them from taking up residence in your home.