How do I train to run a 5k with hills when there are no hills around?

Join a health club with a programmable treadmill (the kind that tilts to approximate a hill) or find a sports complex that offers ‘fake’ hill climbing (same thing without the membership).

Halfway through your post I was thinking of suggesting stadium steps, then I saw you already thought of it. I’d say that’s definitely the way to go. I’m training for a 5K that is a week from today, but I’m in Oklahoma so I don’t have a hill problem ;)

As much as I hate treadmills for training runs, I can’t help but think their ability to set an incline grade could be a be beneficial….

I agree with everything everyone else has said it will help you to a certain degree but you need the real thing,,,it’s like attempting to train for a swim meet but not having access to a body of water nor a pool !!!

Treadmill with incline.

A treadmill can approximate, but actually running on hills can be quite different (environmental factors). Is there anywhere hilly in driving distance where you could practice at least once or twice to get a feel for how running on a hill will actually feel and gauge how ready you are?

Move. Nothing good can come of living in flat country.
It’ll help you train, too.

Yes, run from Kansas to San Francisco and you’ll be ready for anything.

It’s too bad you don’t live around here. It’s uphill no matter which direction you go, and coming back is uphill as well.