Le Grizz Ultramarathon

Event overview

Le Grizz is a fall trail and gravel-road race held near Glacier National Park in northwest Montana. The 2025 edition is scheduled for Saturday, October 11, 2025. The event is organized in partnership with the Glacier Institute and benefits the Glacier Institute’s Big Creek Outdoor Education Center. Le Grizz began in 1982 and has been held each autumn on the second Saturday of October since its origin. It also serves as the culminating event of the Flathead Race Series when combined with local races earlier in the year.

Course, distances and event features

The race takes place in the North Fork of the Flathead River area and is run mostly on gravel roads that parallel the river. The listed venue is the Big Creek Outdoor Education Center in Polebridge, MT, but the exact 2025 course is TBD because of road construction; past courses have started and finished at locations such as the Polebridge Mercantile and have used North Fork Road and Big Creek Road. Runners for the 50-mile event can generally expect about 2,300 feet of elevation gain over 50 miles on undulating gravel roads with occasional gentle inclines. Distances offered include:

• 50 miles (ultramarathon)
• 50-mile relay
• 15K
• 5K

Finishers receive a T-shirt and a finishers award. The event includes a post-race fried chicken picnic, Montana-brewed beer, and complimentary huckleberry bear claws provided by the Polebridge Mercantile. Visit the organization's website for the most recent information.