We recommend fertilizing with a starter fertilizer at time of seeding. Make sure to use a starter fertilizer, as it will include extra phosphorous to help the plants early growth. It is also very important to check the pH value for your soil. If it is under 5.7, add lime to improve the pH levels. Your soil may need other amendments in addition to food (or fertilizer) for the grass. The best way to know your needs is to get a soil test to actually determine your lawns fertility needs. If this is not possible, check with your local extension agency or nursery to find the recommendations for your area. There is good data that shows late fall applications are very helpful in root development. These may be more important and beneficial than early spring fertilizer applications.