Marathons in Idaho 2026 | Upcoming Races & Dates

There are 7 marathons in Idaho scheduled for 2026. The next is the Malad Valley Marathon in Malad City on September 12. Idaho marathons run primarily September through May.

Mesa Falls Marathon

Sat, Jul 18 · Ashton, ID Ashton

1 Mile Family Fun Run5k Fun Run10k Fun Run +2

From $15 Open Closing Soon

Malad Valley Marathon

Sat, Sep 12 · Malad City, ID Malad City

1 Mile Fun Run5K10K +2

From $15 Open Closing Soon

Idaho High Mountain Triathlon

Sat, Oct 3 · Yellow Pine, ID Yellow Pine

Idaho High Mountain Adaptive TriathlonIdaho High Mountain Relay TriathlonIdaho High Mountain Triathlon Adaptive Relay +2

From $100 Open 20 spots left

Hayden Lake Marathon

Sat, Oct 10 · Hayden Lake, ID Hayden Lake

Kids Fun Run5KQuarter Marathon +3

From $0 Open Closing Soon

City of Trees Marathon

Sun, Oct 11 · Boise, ID Boise

5k10kHalf Marathon +2

From $35 Open Closing Soon

Idaho Running Day

Sat, Oct 17 · Boise, ID Boise

5K10KHalf Marathon +1

From $25 Open Closing Soon

Boise River Marathon

Sun, May 2 · Boise, ID Boise

5k5k10k +7

From $35 Open

YMCA Famous Idaho Potato Marathon & Fun Runs

Sat, May 15 · Boise, ID Boise

5K Spud Run5K Spud Run10K +5

From $30 Open

Marathons in Idaho — 2026

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