It's the kickoff to a five-day event that's expected to draw between 60,000 and 70,000 visitors.
Livestock exhibitors are getting ready to show their animals. Entrants have brought their best samples of produce and flowers. Food booths are teeming with cooks ready to test your taste buds.
The carnival's ready. And don't forget the Karl Tyler Chevrolet Cadillac Ranch Rodeo on Tuesday evening.
"This is the 100th year the fair has been held on these fairgrounds," said Fair Manager Todd Garrett. "We're reaching back to something like the Ranch Rodeo that celebrated the agricultural roots of Missoula. So we'd like to embrace the past plan for the future and offer people a mix of both worlds."