It is generally better to spray for mosquitoes in the evening or late afternoon rather than morning for several reasons related to mosquito behavior, chemical effectiveness, and safety. Mosquitoes are most active at dusk and dawn, particularly in evening around sunset, when they come out to feed, so spraying in evening targets them when they are most active and exposed on foliage and resting areas, increasing contact with insecticide. Evening spraying also has advantages because temperatures are cooler, winds are calmer, and sun is lower, which reduces evaporation of spray droplets and allows product to settle on leaves and shrubs where mosquitoes rest, providing longer residual effect. Spraying in midday heat causes spray to evaporate quickly and can degrade chemical due to UV. Morning spraying can work, especially early morning before 10 am when temperatures still cool, but mosquitoes may be less active than evening, and beneficial pollinators like bees are more active in morning, so evening spraying reduces risk to bees, as bees return to hives in evening. Professional companies like Mosquito Joe and Mosquito Squad typically schedule barrier treatments in late afternoon or evening for effectiveness and to avoid harming pollinators. If using fogger yourself, spray when wind less than 10 mph, avoid spraying before rain, and keep pets and children indoors until dry, typically 30 minutes.
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