Seasonal for the Northern Hemisphere isn't the same everywhere. We can grow most of the vegetables on your list in at least two crops per year, a spring and a fall crop.
What is fun is eating not just seasonal but native. We have native cherries here that are ripe at the end of September. You can munch on them while hiking. They're not worth collecting in large quantities though. Best left for the birds and bears.
I collect wild greens. I get wild mustard, plantain (not a banana but a green) and stinging nettles whenever I can. Chickweed and bedstraw is edible but a little stemmy. Miner's lettuce is really good when cooked. I've been collecting the mustard and plantain right now. All that stuff will pop up as soon as it rains in fall, winter or spring and some of it grows as weeds all the time. Lately instead of spending $3 for a bunch of swiss chard from who knows where I just take a walk and pick some wild stuff.
I've started learning about mushrooms. I've eaten wild chanterelles and puffballs. The puffballs were supposed to be not very good since they weren't the sought-after variety but I thought they tasted great. Puffballs and wild mustard greens in an omelet is great!
We have tons of acorns here, but the process to make the edible doesn't sound worth it to me.
We have tons of bayberries right now. I read some guy's website where he said he roasted them until almost burnt and ground them into a paste like chocolate. Sounds not worth it to me.
There are other things the Chumash ate around here, like Chia or some of the other plant seeds and berries, but none of them sounded all that appealing. I know some people like Chia but Chia is spiny and hurts like heck. Pretty in spring but painful when gone to seed.
Female, 5'3", 48, Starting weight: 163lbs. Current weight: 135.
Starting squat: 45lbs. Current squat: 145 x 4.