Idaho has 15 active marathons this year. Races are most common in September, October, and May. Course terrain for these courses is most often rolling hills or hilly. Typical race day temperatures range from 44°F to 70°F.
Popular races include the Coeur d Alene Marathon, Boise River Marathon, and City of Trees Marathon. There is 1 new marathon in Idaho this year — Malad Valley Marathon. 7 certified courses can be great Boston qualifier options. Races with the best Boston qualifying percentages include the Famous Idaho Potato Marathon — 12.9% BQ and Pocatello Marathon — 10.0% BQ.
| Idaho Marathons |
Course
|
PR Score
|
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|---|---|---|---|---|---|---|---|
Boise River MarathonBoise, ID05/02/2026 |  Rolling Hills 283 Finishers |
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Famous Idaho Potato MarathonBoise, ID05/16/2026 |  Mostly Flat264 Finishers |
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Coeur d Alene MarathonCoeur d' Alene, ID05/24/2026 | Rolling Hills412 Finishers |
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Bear Lake Idaho MarathonBear Lake, ID06/05/2026 | Rolling Hills35 Finishers |
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Teton Dam MarathonRexburg, ID06/06/2026 |  Hilly97 Finishers |
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Boise MarathonBoise, ID06/20/2026 | Mostly Flat109 Finishers |
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Mesa Falls MarathonAshton, ID07/18/2026 |  Downhill167 Finishers |
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Idaho Falls MarathonIdaho Falls, ID07/25/2026 | Rolling Hills82 Finishers |
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Pocatello MarathonPocatello, ID09/05/2026 | Downhill251 Finishers |
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Salmon MarathonSalmon, ID09/05/2026 | Downhill26 Finishers |
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Malad Valley MarathonMalad City, ID09/12/2026 | Hilly
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Priest Lake MarathonPriest Lake, ID09/19/2026 | Hilly31 Finishers |
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City of Trees MarathonBoise, ID10/10/2026 | Rolling Hills266 Finishers |
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Hayden Lake MarathonHayden Lake, ID10/10/2026 | Hilly84 Finishers |
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Idaho Running Day MarathonBoise, ID10/17/2026 | Rolling Hills67 Finishers |
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