Most would agree that the best time to overseed or apply sod would be during the spring or fall. Cool weather seems to be more agreeable. You want to keep the seeds moist so be sure to use organic compost with it. Additionally, don’t forget that it is imperative to water your new lawn for up to 4 weeks if you want it to be healthy. You want to water the lawn long enough to ensure the new seed and sod are kept moist.