Kinda depends on where you are.

Westchester NY 7a zone

I like to have kale and collards because they live through freezes here ( not some of the polar vortex ones though). I like that I can cut small amounts of kale whenever, and mix with lettuces from grocery, or add to soups. And they really need to be started , if from seed, when it still feels like summer to me, in order to get good light for strong plants. Or if I wait I have to use nursery transplants, which don’t come into stock for a good while.
Also start pots of arugula soon.

I heard about kale this time of season I tried it once from seed I may try it again. Do you think I'm it's good to do now? Anything else you recommend?

Brassicas (cabbage, kale, cauliflower, broccoli, kohlrabi), radishes, and similar plants like arugula/ mustards can be grown. Larger plants you would want transplants. Seeding root crops like carrots and winter radishes now they will grow until the ground freezes. Lettuce can be grown but personally I don't find the results to be worth the effort, but you can try if you want. I've heard you can grow peas, but never had success.

Problems are that it is too hot for cooler crops with lots of pests in August. September can be better warm but mild. October on you get less sun and obviously it gets colder, hope for mild weather

You have to consider the shortening of the days as well. Here in zone 6B/7A fall carrots, beets, collards are already in the ground and up. Winter savoy cabbage was sowed July 1 in little pots and is in the ground. Asian radishes went in yesterday and turnips today. Fall lettuce will go in soon as will Gailan and Chinese cabbage. Winter lettuce, a very cold hardy variety, is sowed in early September and spinach in late September to winter over. I have wonderful winter lettuce all winter into spring covered with plastic held up by hoops. The savoy cabbages get covered with row covers and last well into February. A couple of times temps around zero have been predicted. I pack the savoy cabbages with hay, then cover with double row covers. The lettuce I cover with several layers of row cover (under the plastic tent) and cover that with hay. Both crops have made it through every time.

Beets. You have to get them seeded now, though.

Can't go wrong with collards . I think they're more cold tolerant than kale.

For winter kale my favorite is Winterbor. I also do Dwarf Siberian kale.

Turnips do well for the fall going into winter ( at least for me , Purple Top is the usual ) Can get turnip greens for a while till they get tough , then the roots later.

Also there's rutabaga ( similar to turnips)

I also do spinach, mustard , Chard and onions from sets under low tunnels.

The spinach can overwinter and produce in the following spring with a sweet taste before spring planted spinach can produce.

The fall planted onion sets mature the following summer with sized up bulbs and can be used for green onions through the winter.

And garlic.

I've done brassicas and green shelling peas with mixed success.

And yes , if you have a hot dry fall on into Sept , and plagued with insects ( like I do a lot of times) , it can be a pain to get these things going.

And the sun angle keeps getting lower.

Okie HU

xxnonamexx....Just curious about your fence. Are you keeping out deer? I think your bottom part is chain-link? What is the top part made out of? Do you have to put anything like chicken wire buried at the bottom? Any intruders so far? Looks like you live in the woods?

I want to put in something in th Fall, but it's still too HOT to start anything now. I live in California so I have a long fall/winter - If we get one this year... who know what this will be like. ?

The peas are to go in at least by October, so does the onion and garlic. Anyone from CA have any idea?

My fall planting window here is short, Aug 23-27 is best for putting out broccoli & cabbage transplants. At the same time I'll plant beets, carrots, collards, and turnip seeds (White Lady turnips, milder). I'll plant more turnips around Sept 5th since they grow fast. Also plant spinach seed in mid Nov to overwinter for an extra early spring harvest with more picking time before bolting. I used to plant lettuce and peas but I'm slowing down, nyuk.