Half Marathons in Idaho 2026 | Upcoming Races & Dates

There are 9 half marathons in Idaho scheduled for 2026. The next is the Haunted Half Marathon and 5k by Run the Undergrad in Rexburg on October 24. Idaho half marathons run primarily October through August.

Eternal Surrender Half Marathon

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

5k10kHalf Marathon +2

From $35 Closed

Haunted Half Marathon and 5k by Run the Undergrad

Sat, Oct 24 · Rexburg, ID Rexburg

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

From $10 Open Closing Soon

YMCA Halloween Run presented by Micron

Sat, Oct 24 · Boise, ID Boise

Monster MileFreaky 5KHalf Marathon

From $30 Open Closing Soon

Halloween Hustle

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

Goblin Kids Fun RunFreaky 5KTeam Hoyt 5K +4

From $20 Open Closing Soon

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 Closing Soon

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

Spring Dash

Sat, Apr 24 · Coeur d'Alene, ID Coeur d'Alene

5K5K10K +7

From $0 Open

Popsicle 5K/10K/Half - Boise

Sun, Aug 22 · Boise, ID Boise

5K-No Shirt5K5K +15

From $35 Closed

Half Marathons in Idaho — 2026

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