Late summer veggie planting?

Late summer veggie planting?

So... I don't think I'm going to plant any lettuce next year. It just explodes and I can't eat it fast enough, or enough of it, so it begins flowering. I've ripped out all of the current flowering lettuce plants which, naturally, has left me with a huge gaping hole in my little vegetable garden. It's August and I live in zone 4 (Minnesota). Is there ANYTHING I can plant there at this time of the year that might still pop up around fall? It would be nice...
just thought i might share ..

just thought i might share ..

Autumn Toadstools

Autumn Toadstools

sad plants

sad plants

OMG! Look What I FOUND!!

OMG! Look What I FOUND!!

Volunteer ID, Pictures!

Volunteer ID, Pictures!

back yard bats

back yard bats