Half Marathons in Idaho
As of October 6, 2026, Crewable lists 10 upcoming half marathons in Idaho from October 2026 to May 2027. The next is Hayden Lake Marathon on October 10 in Hayden Lake. Registration is open for 9.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
Race calendar
October 2026
8 racesHaunted Half Marathon and 5k by Run the Undergrad
Rexburg, IDHalf Marathon5KOpen until Oct 24from $10
November 2026
1 raceMay 2027
1 raceQuick answers
What is the next half marathon in Idaho?
Hayden Lake Marathon, on Saturday, October 10, 2026, in Hayden Lake. Distances: Marathon, Half Marathon, 6.55 mi.
How many half marathons in Idaho have open registration?
9 of the 10 list registration as open as of October 6, 2026, including Hayden Lake Marathon, Rush Creek Stampede and City of Trees Marathon.
What is the busiest month for half marathons in Idaho?
October 2026, with 8 of the 10. November 2026 follows with 1.
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