Now is the time to top dress your lawns. You want to have a prolonged period of time for the top dressing material to get rained on or irrigated before the temperatures start to rise. It’s really important to have a break in period prior to the temps getting into the 80’s. During the cooler months the top dressing will have time to be in contact with the cool moist soil. This will help the process of dissipating the material into the soil where it can start the process of increasing the level of microbial activity.