The answer to 'when to treat for mosquito control' is that the best time to treat for mosquitoes is in the spring and early summer, before their populations peak. Mosquitoes breed in standing water, so it's important to eliminate any sources of stagnant water around your home, such as clogged gutters, bird baths, or kiddie pools. Treating with an insecticide or natural repellent can help reduce mosquito numbers and protect your family from mosquito-borne illnesses like West Nile virus.
The most effective time to treat for mosquitoes is when their eggs first hatch in the spring, before the adult population has a chance to grow. This is typically around April or May, depending on your local climate. You may need to reapply treatments every 4-6 weeks throughout the mosquito season, which can last from spring through early fall.