How to winterize a lawn in 7 steps: Keep mowing until grass goes dormant. Kill perennial weeds with pre-emergent herbicide. Clean up fall leaves and thatch. Aerate the lawn. Spread winter fertilizer. Overseed with cool season grass seed. Cover cold-sensitive plants with burlap. Do you want your lawn to look amazing in the spring? Don’t want any weeds or bare spots in your backyard? Then you better start winterizing your lawn before frost hits! Doing it myself for many years, I can guarantee you that fall lawn prep makes grass grow strong and healthy throughout the rest of the year. …