This one is not necessarily a winterizing tip per say. It can be done in the early fall or spring. OK, let’s back up.. what is thatch?
Thatch is the layer of built-up plant material between the green top growth and the roots of grass plants. Thatch develops naturally as lawn grasses grow and slough off roots, shoots and leaves. Some thatch helps protect the roots, but excessive thatch prevents moisture, oxygen and nutrients from penetrating the soil.
You can easily determine if your lawn has too much thatch. Start by digging up a small plug of lawn. Next, measure the layer of thatch between the top growth and the root zone. If it measures more than 1/2" in depth, you should dethatch the lawn.
Thorough raking with a metal spring rakes does help. However, ideally effective thatching should be done with a thatching rake.
Two examples of a thatching rake below:
After thatching the vast amounts of material. You can go over it again with a metal spring rake to remove the smaller debris. Caution: when you are done your lawn will look a bit beat-up. That is normal. It is good to water and feed the lawn after a thorough thatching.