There isn't necessarily a "best" time of year for pest control. However, it's generally most effective to address an infestation when it's still in its early stages. So if you're noticing pests in your home, it's best to contact a pest control service as soon as possible.
The best time of year for pest control is different depending on the type of pest. For instance, ants are more common in the spring and summer, while rodents are more common in the winter. So it's important to consult with a professional pest control service to find out when they recommend treating your specific problem.