South Dakota has 6 active marathons this year. Races are most common in October, September, and June. Course terrain for these courses is most often mostly flat or very hilly. Typical race day temperatures range from 45°F to 67°F.
Popular races include the Sioux Falls Marathon, Deadwood-Mickelson Trail Marathon, and Sundance to Spearfish Marathon. 6 certified courses can be great Boston qualifier options. Races with the best Boston qualifying percentages include the Leading Ladies Marathon — 22.7% BQ and Brookings Marathon — 8.9% BQ.
| South Dakota Marathons |
Course
|
PR Score
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|---|---|---|---|---|---|---|---|
Deadwood-Mickelson Trail MarathonDeadwood, SD06/06/2027 |  Very Hilly 238 Finishers |
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Leading Ladies MarathonSpearfish, SD08/23/2026 |  Downhill75 Finishers |
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Sundance to Spearfish MarathonSpearfish, SD09/13/2026 | Downhill131 Finishers |
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Sioux Falls MarathonSioux Falls, SD09/19/2027 |  Mostly Flat404 Finishers |
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Brookings MarathonBrookings, SD10/03/2026 | Mostly Flat90 Finishers |
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Run Crazy Horse MarathonHill City, SD10/04/2026 | Very Hilly111 Finishers |
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