The best time to repair bare spots in your lawn will depend on the type of grass and the climate in which it is being planted. Most warm-season grasses should be planted in late spring to early summer, while cool-season grasses are better repaired in the fall. However, before repairing your bare spots, we would recommend that you ensure that soil is healthy. Patchy spots are sometimes indicative of unhealthy soil. A frequent cause of this can be from pet urination. To learn more visit our article "How to Repair Bare Spots in Your Lawn."