Fastest Marathon Courses in Idaho

This list ranks the fastest marathons in Idaho based on the race's Course Score. The Course Score for each marathon is created from an algorithm derived from research on how grade and elevation affect marathon running performance (race time weather is not factored in). For more detailed information, please visit the FAQ.

The BQ % is the percentage of runners who qualified for the Boston Marathon according to the latest race results. Although it is not always indicative of a fast or slow course, the percent of Boston Marathon qualifiers can provide insight into the quality of the field and/or the speed of the course.

To see a ranking of marathons based on the weather factors, in addition to the course characteristics, visit the Fastest Marathons page.

The list only includes certified marathon courses. Keep in mind that PR Scores and ranking assume very good course management and pacing - especially for the extremely downhill races.