Just read this article--referenced it in Pea Growing, 2022--and it is a thorough explanation of Fall Planting.
I haven't started this so far, but I fully intend to be on top of it this year. I have known for several years that Brussels Sprouts don't taste good as a Spring Crop, and it is recommended as a Fall Crop. I didn't know that last Fall is Would have been warm enough for me to have started spinach from seed in September. I thought that I had lost my window, but the weather just wouldn't cool off, so I could have had a harvest. Here is the article:
Wondering when is the best time to plant crops in the fall? Find ideal planting times for your favorite crops for an autumn garden at Gardener’s Path.
gardenerspath.com
You have to get a notebook and do some figuring and Planning. You will need to know:
1) Last average frost date for YOUR property. Early or late won't matter bc cool weather crops are tolerant
2) How many weeks ahead you need to start your fall crops
3) Direct seed or indoor starting
4) IF indoor starting, soil temperature is critical bc SOME cool weather crops won't sprout weel if the soil is too warm
I hope to master this in 2022 bc I Really want to grow/harvest and freeze Brussels Sprouts
This winter I froze onions and the last of sweet pepper harvest. They have worked well for cooking, albeit the sweet peppers tend to dissolve in the food, taste remains but you cannot see them, like in chili!

I have bought frozen Brussels Sprouts before. As long as I blanch them, they should keep.