Western Montana Fair Pokestops
This year's Western Montana Fair is August 9th through 14th and features some fun, new attractions, like a Brewfest and Pokestops, and some fun, familiar events, like the Demo Derby.
Here's a map of this year's layout, complete with Pokestops.
The map shows that you can find Pokestops near Brooks, South Avenue, the main entrance and on Concession Row.