The answer to 'when to treat for rodent control' is that you should treat for rodents as soon as you notice signs of an infestation, such as droppings, gnaw marks, or evidence of nesting. Rodents can reproduce quickly and cause significant damage to your home, so it's important to address the problem right away.
The best time to treat for rodents is in the fall, when they start looking for warm places to nest for the winter. However, you may need to treat year-round if you have an ongoing problem. Be sure to use a combination of prevention, exclusion, and targeted treatment methods to effectively control rodents in and around your home.