Ultramarathons in Idaho
Idaho has 3 upcoming ultramarathons scheduled for 2026: ZD30 The Summit (1 Mile, 5K, and 10K, 1/2 Marathon, 30 Mile Ultra) in Boise on November 7, ZD30 The Summit (1 Mile, 5K, and 10K, 1/2 Marathon, 30 Mile Ultra) in Boise on November 14, and Dizzy Horse, A Winter Backyard Ultra in Idaho Falls on January 8.
Showing all 3
Ultra
ZD30 The Summit (1 Mile, 5K, and 10K, 1/2 Marathon, 30 Mile Ultra)
November 7, 2026
Boise, ID
Ultra
ZD30 The Summit (1 Mile, 5K, and 10K, 1/2 Marathon, 30 Mile Ultra)
Boise, ID
Ultra
ZD30 The Summit (1 Mile, 5K, and 10K, 1/2 Marathon, 30 Mile Ultra)
November 14, 2026
Boise, ID
Frequently asked questions
What is an ultramarathon?▾
An ultramarathon is any race longer than the standard marathon distance of 26.2 miles. Common ultra distances are 50K (31 miles), 50 miles, 100K (62 miles), and 100 miles. Most ultras take place on trails.
What are the most famous ultramarathons in the US?▾
Western States 100 is the most prestigious, followed by Leadville Trail 100, Hardrock 100, and UTMB Canyons. The JFK 50 Mile is the oldest US ultra, running since 1963. Find all of these on RACE.
How do I train for my first ultra?▾
Most runners build up to their first 50K after completing a marathon. Training typically spans 16-24 weeks with weekly mileage of 40-60 miles, including back-to-back long runs on weekends to simulate race-day fatigue.
Do I need trail experience for an ultramarathon?▾
While many ultras are on trails, some are on roads or mixed terrain. For trail ultras, practice running on uneven surfaces and hills. A 50K on a relatively flat trail is a great first ultra for road runners making the transition.