Scrub out your bird bath every week, if you have one, using a nylon scrub brush, and replace the water in it. The standing water draws mosquitoes, which will lay their eggs in it.
Look around for sources of standing water and get rid of them. Old pails and buckets lying around your yard fill up with water during the rainstorms and provide mosquitoes with a breeding ground. Store these items mouth-down, or get rid of them.
Trim back shrubs and trees, reducing the overgrowth in your yard. Overgrown plants create marshy areas underneath that gather moisture more easily.
Inspect your trees for any hollows that hold water. If you find any hollows containing water, fill them with sand to prevent mosquitoes from using them as a breeding area.
Mow your lawn at least once a week. The shady area underneath overgrown grass tends to gather moisture and attract mosquitoes.
Clear any debris from your rain gutters. The debris traps water, providing mosquitoes with enough water to breed.