Picked all the green tomatoes on Wednesday before the first frost here in CT. Have them all in paper bags hoping that they will ripen. We figure well over 300 lbs of heirloom tomatoes this year! Picked the last of the celery too as I wanted to put some garlic in where I had had the celery.
Carrots, beets, collards, kale, lettuce and radishes still doing good and have some potatoes to dig up. Put in a section of garlic for the Spring. The fall carrots are so much better then the ones I put in in the Spring.
Now that it's gotten cold here, is it too late to put in a winter ground cover? Definitely want to try green manure next year. We're going to try composting our leaves this year. We sure have a lot of leaves LOL.
Last big harvest this past Wednesday
Finally got the giant brandywine ripe. One tomato weighed in over 1-1/2 lbs! IT's ready to be eaten with fresh mozzarella and olive oil. 
Beautiful pictures. Thanks for sharing them. You have really done great this year. If your weather is like ours where you actually get a warm up after the first couple of frosts or so, I’d say you could Plant some stuff.
Winter wheat can be used, and it has to be planted after frost, so that the Hessian Fly is dead. Some people in your area grow garden stuff in “hot beds”. These are beds that have a big manure base for heat. Other wise they are the same as a cold frame.
The winter cover crops in general just go dormant when a freeze comes, and when it warms up enough they start growing again. It’s too late for fava beans.
You could try winter wheat, vetch, rye, and/or alfalfa. Vetch is good to plant where you had cukes, melons etc. If you plant winter wheat, in the early spring you can interseed with red clover. Rye should be winter cereal rye.