Andy - fall is a great time to sow any native annual seeds.
It might be a bit late now, but you could test sow a few types in small area, and see if they come up!
Best to do while soil is not frozen, maybe rake the surface a bit before sowing, to make grooves for seeds to set in, and then a light tamping of the soil with your foot after you are done sowing.
http://nativeideals.com/ is based in Arlee, MT and have some seed mixes that would be great for your site - they aren't food but they are native! I've had great luck with their flower seeds for starting
perennial container plants.