It's a bit late to plant, but I am thinking more for next season. Would lettuce grow? What about others?

....corn?

I used to live in Colorado....and I know it's kind of the same. Any sort of squash....pumpkins.....cucumbers... lettuce...cabbage.....certain types of carrots

I'm sure there's more but that's what I have experience with.

Try the website listed below for a garden center hopefully near you.
They have several in the state of Nebraska.
My family used their products very sucessfully for many years here in the midwest.
Just select the state of Nebraska to find the nearest on to you.
Thanks.