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...
My home in Colorado Springs, CO

My home in Colorado Springs, CO

Thank You for all the ideas for flower garden

Thank You for all the ideas for flower garden

The ultimate thriftiness with food!

The ultimate thriftiness with food!

Color Help!

Color Help!

Tonights highlights

Tonights highlights

Mystery pod and LOTS OF BEANS

Mystery pod and LOTS OF BEANS