The answer to 'when to treat for mouse' is that the best time to treat for mice in your home is as soon as you suspect an infestation. Mice can reproduce quickly, so early intervention is key to preventing a larger problem. Look for signs of mice such as droppings, gnaw marks, or nests, and take action immediately.
The most effective time to treat for mice is in the fall and winter months when they are more likely to seek shelter indoors. Mice are attracted to warmth, food sources, and nesting materials, so they will often move into homes and other buildings as the weather gets colder. However, mice can be a problem year-round, so it's important to stay vigilant and address any signs of an infestation promptly.