Half Marathons in Idaho
Idaho has 8 upcoming half marathons scheduled for 2026. Boise is the busiest city with 3 races, ahead of Coeur D Alene (2) and Idaho Falls (1).
Showing all 8
Running
Running for Children's Rights to Both Parents - 7 of 50 Half Marathons in 50 States - Idaho
July 18, 2026
Ashton, ID
Running
Eternal Surrender 5K, 10K and Half Marathon
Coeur D Alene, ID
Running
Eternal Surrender 5K, 10K and Half Marathon
August 22, 2026
Coeur D Alene, ID
Frequently asked questions
How long is a half marathon?▾
A half marathon is 13.1 miles (21.1 kilometers). It is one of the most popular race distances in the US, attracting over 2 million finishers annually. Browse half marathons on RACE to find one near you.
How should I train for my first half marathon?▾
Most beginner training plans are 10-12 weeks long and gradually build your weekly mileage. A typical plan includes 3-4 runs per week with one long run that peaks around 10-11 miles before race day.
What is a good half marathon time?▾
The average US half marathon finish time is about 2 hours 10 minutes. Beginners often aim for under 2:30, while competitive runners target sub-1:45. Focus on finishing strong rather than a specific pace for your first race.
What are the biggest half marathons in the US?▾
The largest include the United Airlines NYC Half, RBC Brooklyn Half, Disney Princess Half Marathon, and the Rock 'n' Roll series events in Las Vegas, Nashville, and San Diego. You can find all of these on RACE.