Winterizing the lawn is synonymous with providing the proper annual maintenance. Most lawn maintenance other than mowing should be done between August and November.
Before fertilizing the lawn, you should have the soil tested. This will determine whether or not you can apply additional phosphorus to your lawn. The test results will also determine whether or not you should add limestone to your soil in order to raise the pH.
If your lawn receives lots of foot traffic or may be compacted from some other reason, or if it is heavy clay soil, it may be appropriate to aerate the soil. This can be done right before you top-seed the lawn (anytime prior to October 15)..
Fertilizer application is now regulated by the Fertilizer Use Act of 2011, and dictates the amount of nitrogen you are legally allowed to apply to your lawn. (see below)
The following publication may also be of help: