The answer to 'when to treat for ant control' is that the best time to treat for ants is when you first notice them. Ants are most active during the spring and summer months, so this is the prime time to take action against an ant infestation. Early treatment is key to preventing a larger problem from developing.
Treating for ants early on, before the colony has a chance to grow, will be more effective and require less extensive measures. Look for signs of ant activity like trails, piles of dirt, or swarming near your home, and address the issue as soon as you notice it.