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Marathon directory

Marathons in Idaho, United States

28 upcoming marathons listed in Idaho across 2 cities. Next: Owyhee County 50/50 Night Run on July 31, 2026.

28marathons upcoming
2cities
July 31, 2026Next race
Marathon, Half marathon, Ultra, 10K, 5K, VirtualDistances
Idaho Falls, Idaho, United States
08JAN
ULTRA
Dizzy Horse, A Winter Backyard Ultra
Idaho Falls, Idaho, United States
January 8, 2027 JAN
Boise, Idaho, United States
17APR
21.1K
Race to Robie Creek®
Boise, Idaho, United States
April 17, 2027 APR
Eagle, Idaho, United States
01MAY
42.2K
Boise River Marathon
Eagle, Idaho, United States
May 1, 2027 MAY
Idaho, United States
16MAY
ULTRA
YMCA Famous Idaho Potato Marathon
Idaho, United States
May 16, 2027 MAY

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Cities

Place Marathons
Boise 1
Sun Valley 1

Planning notes for Idaho, United States

Use this region page to shortlist 28 upcoming races by date, distance, registration path, and official source.

  • Next raceOwyhee County 50/50 Night Run on July 31, 2026
  • Busy monthsSeptember (9), October (8), August (3)
  • DistancesMarathon, Half marathon, Ultra, 10K, 5K, Virtual
  • VerifyOpen each race page, then confirm details from its official, registration, course-map, or source link.

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