Now is the time to plant your spring blooming bulbs. I've planted tulips, daffodils, crocus, and silica (I think). There is still a big box of lilies and irises that Ray's Gran sent to me. I haven't decided where to put them yet, but I need to get on it soon. You should plant your bulbs before the ground freezes.
In some areas you might be able to plant a winter garden, or go to your local nursery and buy some plants such as kale for winter. You may also buy a variety of winter pansies for your flower boxes. I planted my winter garden in the middle of Sept. It includes carrots (Mokum Hybrid), lettuce (Artic King), and two different types of garlic. So far my carrots and lettuce have good germinations on them. I mixed in some compost with the soil. With the garlic planted between the two there is little risk of bugs, although winter you should have little bugs. The carrots might have gotten some carrot flies but I rest assured the garlic will repel them. When your germinations have a couple of good small leaves on them its time to thin them out so they are far enough apart they will not rob each other of nutrients. The package of seeds should let you know how far that is. Also it's better to wait till the seedlings are a little more established to weed the area, so you do not accidentally pull up the seedlings with the weeds.
That is about it for my winter gardening knowledge. I'll keep you updated on how my garden does.