Being near St Louis myself I think you should try again and even start some indoors. I just started some today indoors (though I should have done this a lot earlier). The lettuce I planted a few weeks ago didn't come up so much. It has been too warm. I was hoping for the best but that didn't come. I did a few than again a week or so later did some more. So far out of the 3 areas and many different types of seed and different planting dates only one is showing signs of growth and that was planted 3-4 weeks ago. At least something came of my work but I'm not going to let it get me down. Like I said I was hoping for the best but not expecting much. It is getting cooler, at least I think it is. So now would be a good time to try again. I will be direct seeding again as well as having the indoor starts as backups.
So onto the next round. We normally have good fall crops around here but this year has been so crazy I am not sure what to expect.
Good luck. To us all.
Oops I didn't see you last post in this thread. It seems you already have started again. Well there you go, everything I said still rings true though.