The answer to 'when to treat for cricket' is that the best time to treat for crickets is in the late summer and early fall, when their populations are typically at their highest. Crickets are most active during the warmer months, and they will start seeking shelter and breeding grounds as the weather cools down in the fall. Treating for crickets during this time can help eliminate them before they become a major problem in your home.
It's important to note that while crickets are generally not harmful, they can be a nuisance and can cause damage to fabrics, paper, and other household items. Treating for them early can help prevent them from becoming an ongoing issue.