The best periods for sowing lawns are in the spring and fall. In the spring, as soon as the risk of frost is over and the yard has been cleaned up, you can sow. Ideally, lawns should be seeded between mid-May and mid-June, after the frost and before the heat. Fall is also a good time to seed lawns since the soil is still warm and water is available for good germination and the development of a strong and deep root system before the snow. Sow from mid-August to mid-September. Your soil should remain moist for two weeks after seeding. Be sure to water daily until the seeds germinate.