Half Marathons in Idaho 2026 | Upcoming Races & Dates | My Next Race

There are 14 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.

Running for Children's Rights to Both Parents - 7 of 50 Half Marathons in 50 States - Idaho

Sat, Jul 18 · Ashton, ID Ashton

Race and Dinner1/2 Marathon (In-Person)1/2 Marathon (Virtual)

From $50 Open

Post Falls Triathlon/Duathlon

Sun, Aug 2 · Post Falls, ID Post Falls

Individual Sprint TriathlonTeam 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

Foothills XC12K

Sat, Aug 22 · Boise, ID Boise

5K12K

From $30 Open

Popsicle 5K/10K/Half - Boise

Sun, Aug 23 · Boise, ID Boise

5KVirtual 5K5K-No Shirt +6

From $35 Open

St. Luke's FitOne 5K/10K/Half Marathon

Sat, Sep 26 · Boise, ID Boise

5K10K13.1 Half Marathon

From $25 Open

Top of Tamarack

Sat, Sep 26 · Tamarack, ID Tamarack

BikeRun/Hike

From $70 Open 100 spots left

Rush Creek Stampede

Sat, Oct 10 · Cambridge, ID Cambridge

5K Run10K Run1/2 Marathon

From $40 Open

Eternal Surrender 5K, 10K and Half Marathon

Sat, Oct 24 · Coeur D Alene, ID Coeur D Alene

5k10kHalf Marathon

From $35 Open

YMCA Halloween Run presented by Micron

Sat, Oct 24 · Boise, ID Boise

Monster MileFreaky 5KHalf Marathon

From $30 Open

Haunted Half Marathon and 5k by Run the Undergrad

Sat, Oct 24 · Rexburg, ID Rexburg

Haunted 5k BYU-I Student EntryHaunted 5kHaunted Half Marathon BYU-I Student Entry +1

From $10 Open

Halloween Hustle

Sun, Oct 25 · Coeur d'Alene, ID Coeur d'Alene

Goblin Kids Fun RunTeam Hoyt 5KFreaky 5K +4

From $0 Open

ZD30 The Summit (1 Mile, 5K, and 10K, 1/2 Marathon, 30 Mile Ultra)

Sat, Nov 7 · Boise, ID Boise

1 Mile Run/Walk5k Run/Walk10k Run/Walk +2

From $20 Open

Boise Half Marathon

Sat, Nov 14 · Boise, ID Boise

Boise Half MarathonVirtual

From $45 Open Closing Soon

Race to Robie Creek®

Sat, Apr 17 · Boise, ID Boise

Half MarathonHalf Marathon

From $75 Closed