It's too late for the spring season, the heat and humidity will do them in. But, you can do a fall crop. Here in the Detroit area, I try to plant them around July 20th to July 25th. They need a little extra TLC during hot dry weather in terms of copious watering. If it's particularly humid weather, you may want to throw on a couple of fungicide sprays.

And, remember, they will grow and mature a lot slower in the much shorter days of late Sept. and Oct, so try to pick earlier varieties, such as Maestro or Little Marvel for shelling peas, Cascadia is a really good snap pea for fall, the standard Dwarf Grey Sugar or Mammoth Melting Sugar for snow peas.

But yes, it certainly can be done, I've had some of my BEST pea crops in the fall. Your planting date range would be the same as mine for all intents and purposes.

Ditto on Denninmi's comments.

"Plant as soon as soil can be worked" is not always practical, nor does that necessarily mean 'early'. For me, unless I want to plant in mud, that usually means sometime in May, or even early June some years. I can usually get away with planting shelling peas late, and often do... they still do OK here planted late. You might still be able to get in a crop of an early variety.

Snow peas, though, are another matter. They are pretty much out of the question this late; the pods will be small & tough if they develop in the heat, and the plants won't make it until Fall.

Sugar snaps might do OK for awhile, but PM will generally do them in during the dog days.

Snap peas have done particularly well for me planted in July. My favorite variety, "Sugar Lace", actually does better planted for Fall... I get better germination, and the pods are sweeter when they develop in cool weather.

I got lucky this year; just saw the weather graphic & my part of the state is in a 'sweet spot' that has only had 30% of our normal May rainfall (and less than that locally). My heavy soil dried out early, so I was able to till early, and got most of my peas in on time. I just planted a few varieties for soup this week, though; soup peas are not as finicky about heat.

Thanks for the responses! I guess I'm still working out some of this timing stuff. I know there are a zillion guides, but it seems like there's more art to it than I realized. I've lived in Z5 midwest my whole life pretty much, but I only really started gardening the last two years when I lived in Z7 tennessee. There we had no cool anything except in the dead of winter, so I only really succeeded with hot season veggies, and these cool season guys are still a mystery to me.

I'll look into the varieties you mention, because I'd really like some sugar snap peas and I'll mark my calendar for late july!