Think of caulk as weatherstripping in a tube. Any gap on the outside of your home can be a candidate for caulking. Look at transition spots: corners, windows, doors, areas where masonry joins siding, or places where vents and other objects protrude from walls. Carefully read manufacturer's directions to make sure the caulk you buy will work where you plan to use it, and don't forget to purchase a caulking gun. Early fall is a good time for this task because caulk becomes difficult to apply when the temperature falls.
If you have a wood stove, it's not too early to lay in a supply of firewood. Though most of us buy whatever's local, bear in mind that soft woods like fir and cedar burn faster and create hazardous creosote in the chimney, thus requiring more system maintenance and more wood. Hardwoods such as oak, hickory and maple are slow, hot, clean burners. Wood piles attract insect and animal pests, so stack wood away from the house. Wood dries best when it's protected from rain and has air circulating around it, so under the roof of a wall-less carport would be an ideal wood storage spot.
This is another one of those tasks that should be on your to-do list every six months. Scoot your clothes dryer away from the wall, unplug it, and vacuum behind it. (If it's a gas dryer, turn off the gas supply to the dryer at the appliance shutoff valve.) Unhook the tube that leads to the vent and clear as much lint from the tube as you can. Grab a shop vacuum, go outside, and tackle the outside dryer vent as well.