The answer to 'when to treat for bees' is that the best time to treat for bees is in the spring or early summer, before their populations peak. Bees are most active during the warmer months when they are building their hives and foraging for nectar and pollen. Treating for bees in the spring or early summer can help control their population and prevent them from becoming a nuisance around your home.
It's important to address any bee issues promptly, as bees can quickly establish large hives that can be difficult to remove. If you notice a new bee hive forming on your property, it's best to call a professional pest control technician to assess the situation and recommend the appropriate treatment approach.