Apples, Peaches, Plums should all grow in your area – be sure to get trees suited to your zone. 3a-4b depending on what part of Montana you live in.

For Vegetables, the principle of germination time plus growing to harvest time must be more than your number of non-freeze days.

Or, you can start the vegies inside. You should be able to grow summer squash, carrots, tomato, beets, herbs, and a bunch of other stuff.

Read a lot, you are in a short season area. Happy Gardening.