The answer to 'when to treat for mosquito' 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 treating breeding sites like gutters, birdbaths, and other water-filled containers can help reduce their numbers.
It's important to treat for mosquitoes before they become a major nuisance. Mosquitoes are most active at dawn and dusk, so treating in the early morning or evening can be more effective. Additionally, treating your yard and surrounding areas can help create a mosquito-free zone around your home.