The only thing I can think of is that they weren't hardened off enough. The bean leaves must be fragile. Looks like environmental (sun/wind/temp) stress.

Agree that it is all environmental damage - sun, wind, and cool temps. In most of zone 5 it is far too early for beans. Beans are a warm weather crop and i can't plant them out for another week or 2 even in my zone.

Dave

Agree sun damage. Some of my basil and peppers have it too.

Eek, not good. Is there anything I can do? Or have I pretty much ruined their chances?

I think they will recover if they still have some healthy leaves and it looks like they do.

If you have the space, you can start another batch direct-sown into the garden. Just in case.

If this batch recovers, you'll have a lot of beans.

Mine are doing the same it’s not to much sun, there producing beans and than turning white and dieing, I dunno if it’s over watering or what, I have them in a green house kinda situatio, they die I plant more they produce again than do the same thing, I guess I’ll figure it out, unless it’s my soil? We’ll see