Think about taking this time to sharpen the blades for the new year
If you get sustained below freezing temperatures in your part of the country you need to think seriously about simple maintenance if you plan to extend the life of your machines. Grass clippings in bags can ruin them, so turn them inside out, rinse and let dry in the sun. You should clean your mower deck after each use, but especially before winter. Grass holds moisture and can rust parts of the mower quicker.
Gas only has a couple months shelf life. You should run that out if you don’t plan on mowing in the next 60 days and put new gas in.
Sharpe blades are going cut more efficiently and cleaner. This will improve the health of your lawn. Now that you have a few winter months off go take the blades to a local shop and get those sharpened. It’s short money for the saved headaches they can cause by creating lawn problems.
If granular fertilizer, you should water in the fertilizer so it can get to the roots, or apply right before a rain.
If you can, mulch the clippings and leave them on the lawn, those are packed with nutrients for the soil! (just not clumpy)
Fertilizing after you mow is important because you want the product typically to be able to reach the soil line. If you fertilize on top of the tall grass the product can be wasted and in some cases even burn the grass leaves.
Some other things to note would be that you should never cut more than 1/3 of the blade of grass off when mowing, and be sure to always water your lawn if it’s been a while without rain!