You can easily extend your growing season by protecting hardy crops with a floating row cover. Where you do not have crops planted, you can improve your soil with a cover crop.
Cover Crops help control erosion during the winter and add organic material and minerals to the soil when turned under in the spring.
Floating Row Covers (FRC) help extend the growing season by providing some protection from cool temperatures. FRC is also used to protect some crops from destructive insects.