You've been weeding until your back hurts all summer, but your job isn't over yet. Before the frost sets in there is plenty to do in your garden to keep it healthy and beautiful, and set it up for the spring.
Every area of the US is different. In Vermont you'll want to take precautions to protect young plants from the freezing cold, whereas in Santa Barbara that won't be as much as a concern. Regardless, there are some garden tasks that are important in every climate.