YES, its actually called “grasscycling” (leaving clippings on lawn when mowing). The clippings quickly decompose and release valueable nutrients back into the soil to feed the grass, reduce overall need for nitrogen.
Spring and fall are both good times to plant, however, we believe the most optimum time is between mid/late August and mid/late September. Mild temperatures make it easy to keep grass seed moist and grass seedlings do not have to struggle in the hot summer sun. And, since this is the dormant period for most weeds and lawn diseases, your grass seed will have a chance to establish itself before they crop up again in summer.
Begin by core aerating in the fall to improve root development and water penetration; follow by overseeding thin areas of lawn with seed blends recommended for your area; top-dress by raking in 1/4 – 1/2″ of compost to improve the soil.