Over seeding with cool season turf grass (fescues/blue grass) is best done in fall but can be done in the spring with more effort. Warm season turf grass (zoysia/buffalo grass) is best done in late spring around June.
Reasons for over seeding in the fall include:
Over seeding is useful for filling in thin patches of grass and creating a thicker, fuller lawn. A thick yard will reduce weeds and block the sun from roots, resulting in less need to spray weeds and also less water. This will save time and money spent. Also, if you keep having the same problem every year with little or no results, new seed might be just what you need. Grass seed has come a long way. New grass has been engineered to resist common problems including drought and even diseases. Some grass is capable of repairing damaged roots of nearby grass, effectively keeping your grass fuller and thicker without doing any additional work.
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