How Long Do Mosquitoes Live? An adult mosquito may live 5–6 months. Few probably make it that long, given our tendency to slap them silly when they land on us. But in the right circumstances, an adult mosquito has quite a long life expectancy, as bugs go. Most adult females live for two to three weeks. For those that winter in your garage, though—look out. Eggs can dry out for eight months and still hatch.