Half Marathons in Idaho 2026 | Upcoming Races & Dates

There are 6 half marathons in Idaho scheduled for 2026. The next is the Outlaw Trail Ultra Half Marathon in Hansen on August 8. Idaho half marathons run primarily August through April.

Post Falls Triathlon/Duathlon

Sun, Aug 2 · Post Falls, ID Post Falls

Team Sprint TriathlonIndividual Sprint TriathlonIndividual Duathlon +1

From $85 Open

Outlaw Trail Ultra Half Marathon

Sat, Aug 8 · Hansen, ID Hansen

Outlaw Trail Ultra Half Marathon

From $85 Open

Bear Lake Brawl Triathlon

Sat, Sep 19 · St Charles, ID St Charles

Half Aquathlon (Swim 1.2 Miles, Run 13.1 Miles)Sprint - Short DistanceSprint Relay 2 to 3 People One Race +7

From $35 Open

Top of Tamarack

Sat, Sep 26 · Tamarack, ID Tamarack

Run/HikeBike

From $70 Open 100 spots left

Boise Half Marathon

Sat, Nov 14 · Boise, ID Boise

Boise Half MarathonVirtual

From $45 Open

Race to Robie Creek®

Sat, Apr 17 · Boise, ID Boise

Half MarathonHalf Marathon

From $75 Closed

Half Marathons in Idaho — 2026

Post Falls Triathlon/Duathlon

Outlaw Trail Ultra Half Marathon

Bear Lake Brawl Triathlon

Top of Tamarack

Boise Half Marathon

Race to Robie Creek®

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