At the height of Idaho’s peaks, runners and ultra-marathoners take to the high country, running vests strapped, running hats tight, trail shoes snug, headlamps flickering and GPS maps dialed. Equal parts eager and uneasy, chasing something beyond distance—where air is thin, and trails are rugged, the Gem State distance runners enjoy a wealth of vistas and sunrises in their pursuit of their physical limits. In Idaho’s wild silence, endurance becomes identity, and the finish line is only the beginning.
If you’re looking for a way to get a taste of what Idaho can offer or slowly get into distance running, here are some options for summer races throughout Idaho.
River of No Return Endurance Runs
June 20—Challis
The River of No Return Endurance Runs in Challis features 32-kilometer, 55-kilometer and 108-kilometer courses with steep elevation gains, including climbs above 9,000 feet. Runners traverse rugged terrain past historic mines, wildlife such as elk and bears, and Idaho’s scenic landscapes, all while being supported by the welcoming Challis community. The event blends challenge, beauty and tradition.
McCall Trailrunning Classic
June 27—McCall
The McCall Trailrunning Classic takes runners through alpine singletrack in the Payette National Forest near Burgdorf Hot Springs. Offering 30k and 50k races, the event features technical terrain, major elevation gains and sweeping views. This has been a McCall tradition since 2012.
To Bone and Back Relay
June 27—Idaho Falls
The To Bone and Back Relay celebrates its 34th year in Southeast Idaho. The 40-mile race features rugged climbs and exposed stretches, with options for teams of eight, four or two, or solo runners tackling the full distance. The event highlights team spirit, scenic challenge and a chance for friends and families to compete for prizes.
Beaverhead Endurance Runs
July 11—Salmon, Leadore, Dillon Mountain
The Beaverhead Endurance Runs in Salmon offer 55k and 100k trail races. The course covers the Continental Divide National Scenic Trail, tracing the Idaho-Montana border, making this event a scenic and demanding test for trail enthusiasts.
Standhope Ultra Challenge
July 24-26—Mackay
Tucked into the rugged folds of Mackay’s Copper Basin and deep within the Pioneer Mountains, the Standhope Ultra Challenge has grown into more than just a race. It features 100-mile, 60k, and 30k trail races. Known for high altitudes, steep climbs reaching 11,000 feet, and remote, technical terrain, the event is a serious test for ultra runners.
Now in its 14th year, the event draws between 400 and 500 runners annually. Race director Mary Martin said the terrain itself is a defining feature. “I think the course speaks for itself, given that it’s in the Pioneer Mountains,” Martin said.
For Martin, the finish line represents more than the end of a race. It’s a moment of personal discovery. “The Standhope Ultra Challenge is an incredibly challenging race,” she said. “I hope it causes people to dig deep and find a strength in a different side to them that they can take into their life that they didn’t really know they had.”
Spartan Race
August 8-9—Payette
The Spartan Race returns to city of Payette for a Trifecta weekend with 5k, 10k and 21k obstacle courses. Set against Western Idaho’s rugged high desert and the Snake River Plain, the event at Pence Ranch offers athletes challenging volcanic terrain and open skies. The course is known for demanding grit and delivering scenic, raw adventure.
Inkom Last Man Standing
August 14—Inkom
The Inkom Last Man Standing uses a backyard ultra format where runners complete a 1.1-mile loop every 20 minutes. The clock resets at the start of each round, eliminating anyone who fails to finish within the time limit. The event continues until only one runner remains, making it a psychological and physical test more than a traditional race.
Harriman Park 50k
August 15—Island Park
The Harriman Park 50k offers a peaceful ultra experience on remote wilderness trails. Runners traverse forests and meadows on gravel roads and pine-needle singletrack, with chances to spot wildlife along the way. The course offers views of the Teton Mountains and the local valley, creating a beautiful, meditative atmosphere for all participants.
Bogus 50/50
September 26—Boise
The Bogus 50/50 features 50-mile, 50k and 27k mountain trail races. Each course starts and finishes at the Fort Boise parking lot in the lower foothills, highlighting Boise’s top trails. Designed for challenge and fun, the event gives runners a chance to experience the region’s favorite routes and mountain landscapes.
Legends Never Die Half Marathon
October 3—Ketchum
What began as a single half-marathon has evolved into a mountain test of endurance, drawing runners to Idaho’s high country each fall for the Legends Never Die race, which features a trail course with about 2,450 feet of elevation gain and a high point of 7,600 feet.
Organized by Thomas Smiley and backed by title sponsor Zenergy Sun Valley, the event now includes both a half-marathon and a 55k. The course winds through terrain that Smiley says defines the race as distinctly Idahoan. “It’s the landscape and the time of year in the fall, with colors that are really spectacular,” Smiley said. “The mountains present some iconic views.”
That goal continues to resonate with runners, particularly newcomers to the sport. “It’s so rewarding to hear people who ran their first half-marathon because Legends Never Die was here,” Smiley said.
As the race continues to grow, Smiley said its purpose remains steady: to challenge runners and connect them with Idaho’s outdoors, one mile at a time.