Check for drafts
Check around windows and doors if there are any spaces where cold air could leak in. Seal these spaces with new frames, drapery, insulation, etc.
Turn off outdoor faucets
To prevent water from freezing within your pipes, turn off your outdoor water faucets. Disconnect hoses and sprinklers so the remaining water can drain out.
Put away all seasonal furniture
If you haven’t done so already from summer, clean off and stow away all outdoor furniture. This will ensure they will not be moldy or pest infested in the spring.
Inspect your chimney
If you have a wood fireplace, and use it often, consider having it cleaned out to have it in good shape for when it gets cold.
Stock up on snow gear
Buy salt for your driveway and sidewalks so that you are ready for when the first snowstorm of the season hits. If you live in an especially cold area that receives a lot of snow, consider buying a snow blower.
Look around to make sure none of your trees have weak branches that could result in thousands of dollars of roof repairs if they were to land on your house.
Clean your gutters
As the leaves start falling from the trees they are going to fill up your gutters. Make sure to get up there and clean them out, so that when it rains water does not overflow onto the foundation of your home.
Fertilize your lawn
After fertilizing your lawn in the fall, it stands a better chance to survive the winter with minimal damage to your yard.
Drain your lawn equipment
Any machines you use for your yard that require gas, such as your lawnmower, should be drained. Keeping excess gas in the tank can lead to a messy buildup and make it hard for the machine to return to work in the spring.