If the surface few inches of your soil are severely compacted, it may be necessary to aerate your lawn. The best time to aerate is when the turf is actively growing. This allows the turf to quickly cover over the holes and prevent weed seed from germinating. For cool-season grasses such as Kentucky bluegrass and tall fescue, the best time to aerate your lawn is in the spring or fall. If you only plan to aerate once, do it in the fall. This will minimize the chance of warm-season weeds like crabgrass gaining an advantage. Little or no advantage can be expected from aeration if the soil is heavily compacted below the surface few inches, or if the sub-surface is heavy clay.
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