There are 13 marathons in Iowa scheduled for 2026. The next is the Haunted 5K, 10K, 13.1M & 26.2M at Des Moines, IA (41) in Des Moines on October 10. Iowa marathons run primarily October.

IMT Des Moines Marathon

Sun, Oct 18 · Des Moines, IA Des Moines
Healthiest State Initiative 5k Presented by HealthPartnersBankers Trust 10KIMT Des Moines Half Marathon +2

IMT Des Moines Marathon - Early Bird

Sat, Oct 16 · Des Moines, IA Des Moines
Free Kids Run presented by Des Moines Children's MuseumFree Kids Run presented by Iowa Trail RunsIowa Heathiest State 5K Presented By HealthPartners +11