Idaho Mud Run & Obstacle Race Calendar 2025-2026

If you're an adrenaline junkie, fitness enthusiast, or simply seeking a thrilling outdoor adventure, you've arrived at the perfect destination. Our meticulously curated calendar is your gateway to the most exhilarating and challenging mud runs and obstacle races taking place in 2025 and 2026.

Prepare to conquer mud-slicked trails, scale towering walls, navigate through grueling obstacles, and push your physical and mental boundaries. Our mission is to provide you with all the essential information you need to plan your race year, including dates, locations, race details, and registration information.

Farm Life 5k Trail Run

Idaho Falls • 2 Aug 2025

5k Fun Run

The Farm Life 5k Trail Run takes place at the Bonneville County Fairgrounds in Idaho Falls, ID. This farm-themed event features a fun, flat 5k course that winds around corrals, horse barns, and fields, providing a unique rural running experience. Multiple water stations are available along the route to keep participants hydrated.

All finishers receive an award, and a portion of the entry fees supports the local 4H Program. Early registration is $10, increasing to $15 after June 30. Additionally, a free Grit League obstacle course for kids is offered during the event, with volunteers supervising.

Participants also receive a coupon for a free breakfast at the fair. Visit the organization's website for the most recent information.

Boise Spartan Trifecta Weekend

Payette • 9-10 Aug 2025

Kids Race 1-3km Sprint 5k ... Beast 21k Hurricane Heat 4hr

The Boise Spartan Trifecta Weekend, held at Tom Pence Ranch in Payette, Idaho, offers a challenging obstacle course racing experience across three distances: the Sprint (5K with 20 obstacles), Super (10K with 25 obstacles), and Beast (21K with 30 obstacles). This event, returning to the Snake River Plain, tests participants' physical and mental endurance on rugged terrain. Additional activities include a kids' race and a 4-hour Hurricane Heat challenge. Participants can race individually or as teams, with special discounts for service members. The weekend promises a tough, transformative experience in a supportive, competitive atmosphere for all ages and skill levels. Visit the organization's website for the most recent information.

LC Valley Down and Dirty Mud Run

Lewiston • 23 Aug 2025

1 Mi 3.2 Mi

The LC Valley Down and Dirty Mud Run, held in Lewiston, Idaho, is a fun and muddy event combining cross country running with obstacle course elements. Offering distances of 1 mile and 3.2 miles, it welcomes participants of all ages and fitness levels, including a Mini-Mudder category for children 10 and under. The event emphasizes enjoyment over competition, encouraging runners to slow down, get muddy, and have fun with friends. Known for its friendly atmosphere and challenging course, the race provides a memorable experience for families and athletes alike, making it a popular community event each August. Visit the organization's website for the most recent information.

Zombie Mania

Rexburg • 11 Oct 2025

1 Mi Costume Run 5 Km Zombie Mania

Zombie Mania is a unique 5K race held in Rexburg, Idaho, featuring a flat loop course through Nature and Eagle Parks. Participants wear flags representing their health while volunteers dressed as zombies attempt to steal these flags, adding an exciting capture-the-flag element to the run. The event welcomes all ages and fitness levels, encouraging runners to move at their own pace—ideally faster than the zombies! For those who prefer a less intense experience, a 1-mile Costume Run is also offered, allowing participants to dress up without zombie chases. This fun, family-friendly event combines running with playful thrills in a scenic park setting. Visit the organization's website for the most recent information.