The best time to power rake a lawn is in the spring between March and May. Power raking does cause some damage to the grass, so completing it in the spring gives the grass time to recover before extreme weather conditions may arise.
Power raking a lawn helps to remove excess thatch that causes damage to the grass. Thatch is a layer of dead and dying grass stems and debris that accumulates in lawns. If the layer gets too thick, it can decrease the effectiveness of fertilizer, increase insects and cause lawn disease. Power raking is one way to get rid of thatch and help promote a thicker, healthier lawn.