Idaho · Half Marathon
Half Marathons in Idaho
Idaho currently has 25 upcoming half marathons with a confirmed date listed in RaceRove. Boise, Pocatello, Sandpoint and Sun Valley have the largest concentration of events.
May (7), June (6) and September (4) are the busiest months on the calendar right now. Another 6 annual half marathons are waiting for next year's date to be announced.
- Upcoming, date confirmed
- 25
- Active listings
- 31
- Cities with races
- 18
More ways to browse Idaho
Upcoming half marathons in Idaho
All 25 with a confirmed date, soonest first.
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Spirit of the Magic Valley Half Marathon, 10K & 5KTwin Falls, IDHalf Marathon10K5KKids 1 Mile ~400 runners
Dates come from each race's own listing. Always confirm on the organiser's site before you book travel.
Largest half marathon events in Idaho
By estimated field size across all distances at the event.
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City of Trees MarathonBoise, ID Usually held in October · next date not announcedMarathonHalf Marathon10K5K ~1,000 runners
When half marathons happen in Idaho
- March
- 1 upcoming race
- April
- 2 upcoming races
- May
- 7 upcoming races
- June
- 6 upcoming races
- July
- 2 upcoming races
- August
- 1 upcoming race
- September
- 4 upcoming races
- October
- 1 upcoming race
- November
- 1 upcoming race
Idaho cities with the most half marathons
- Boise
- 7 upcoming races
- Pocatello
- 2 upcoming races
- Sandpoint
- 2 upcoming races
- Sun Valley
- 2 upcoming races
- Twin Falls
- 2 upcoming races
- Coeur d'Alene
- 1 upcoming race
- Rexburg
- 1 upcoming race
- Ashton
- 1 upcoming race
Annual events awaiting their next date
These half marathons are held every year, but the next date isn't in the listing yet. The month shown is when each is usually held.
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City of Trees MarathonBoise, ID Usually held in October · next date not announcedMarathonHalf Marathon10K5K ~1,000 runners
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Outlaw Trail Ultra Half MarathonHansen, ID Usually held in August · next date not announcedHalf Marathon14.2 Miles ~200 runners
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Eternal Surrender Half MarathonCoeur D Alene, ID Usually held in October · next date not announced5K10KHalf Marathon
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Haunted Half Marathon and 5k by Run the UndergradRexburg, ID Usually held in October · next date not announcedHalf Marathon5K13.2 Miles
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Jackass Half Marathon & 5KKellogg, ID Usually held in October · next date not announcedJackass 5KJackass Half MarathonJackass Half Marathon (Walkers)Kid's Jackass Half Marathon
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Moscow Mountain MadnessMoscow, ID Usually held in October · next date not announced50K1/2 Marathon5 Miler
Half Marathons in nearby states
Guides from the RaceRove blog
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 8 min read How to Choose the Best Half Marathon for a PR, Racecation or 50-State Challenge The best half marathon depends on what you want from it. How to choose a course for a personal record, a race worth travelling for, or an efficient stop on a 50-state challenge.
- 4 min read Diplo's Run Club 2026-27: Every City, Date and Course Diplo's Run Club is a 5K with a post-race concert. Every US date for 2026-27 (San Francisco, New York, Los Angeles, San Diego and Phoenix), start times and courses.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Half Marathons in Idaho: common questions
- How many half marathons are there in Idaho?
- RaceRove currently lists 25 upcoming half marathons in Idaho with a confirmed date, plus 6 annual events whose next date hasn't been announced yet.
- How long is a half marathon?
- A half marathon is 13.1 miles (21.1 kilometres).
- Which Idaho cities have the most half marathons?
- By upcoming events listed in RaceRove: Boise (7), Pocatello (2), Sandpoint (2), Sun Valley (2) and Twin Falls (2).
- When is half marathon season in Idaho?
- Of the upcoming half marathons listed, the busiest months are May (7), June (6) and September (4).
- What is the biggest half marathon in Idaho?
- By estimated field size, the largest event with a half marathon listed in Idaho is the St. Luke's FitOne 5K/10K/Half Marathon, with about 12,000 runners across all of its distances.
Search every half marathon in Idaho
Filter by month, course profile and field size, save races to a shortlist and compare them side by side in the interactive search.