Brian,
Awesome job ~ thanks for showing your beautiful & productive garden space. The summer season is over, but in our climate we can garden into the fall if you desire. If you're done gardening until spring cover crops should be enough to renew the soil.

Since I keep part of it productive I just add compost to spots after harvesting & any beds finished up get topped off with a combination of what I have available. Usually homemade compost, partially composted manure + bedding, and grass clippings mixed with shredded leaves as it comes out of the mower catcher. Our rains keep it from blowing around.

I noticed kale in your pics. Kale sweetens after frost, so you might like to keep some in the garden all winter. Pick outer leaves instead of cut & come again technique. It will flower in spring & self-sow if you let it. I've not sown it in years because I let it self sow & it transplants readily.

I don't keep all the beds productive year round, but it's sure handy to have the vegetables out there.
-Chard & parsley keep as well bouncing back after cold snaps.
-Root vegetables can be kept in the garden until desired if you can protect from freezing, rodents, & excess wetness.
-Onions & garlic can be planted now for harvest next spring & summer. If you already have leek it will stand for you until you want to pick.
-Then there are lettuces & greens you can keep picking especially with protection...
-Celery is good for soups & stews.

I use a few different found items as cloches over individual plants to provide some winter protection later on. In severe weather I'll throw some row covers on. It would be even better if we had plastic hoop cloches over them.

Here is a link that might be useful: Fall & Winter Vegetable Planting Guide