Fall is a great time to get rid of weeds. Consider this: Weeds that are spread by seed produce thousands of seeds. Lambsquarter can bear up to 72,500 seeds per plant, curly dock can bear up to 30,000, purslane 52,000, and redroot pigweed 117,000. If even 50% of the pigweed seedlings germinated next spring, you'd have 58,000 pigweed plants to pull or otherwise get rid of. Better to get rid of them now! Here's a comprehensive list of Wisconsin weeds with photos. I was glad to see Morning Glories appear on this list - I have been trying to get rid of them in a place I no longer wanted them for years.
Hopefully, you have all of your fall garden work done; winter is on the way.
Weed facts from the Colorado State University Cooperative Extension