Which Idaho cities have the most Half Marathon races?
Boise (9), Coeur d'Alene (2), Malad City (1), Priest Lake (1) lead the state for Half Marathon races. Those give you the most dates to choose from if your schedule is tight.
Idaho · Half Marathon
Half Marathon Races in Idaho
Every upcoming Half Marathon in Idaho, all 17 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
17 upcoming Half Marathon races · 8 with finish-time stats
By the numbers
The Biggest and Longest-Running
The Idaho races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
Half Marathon Races by City
Soonest Half Marathon Races in Idaho
17 total Sun, Aug 23, 2026Popsicle 5K/10K/Half - Boise Boise, IDFrom $35Details Sat, Sep 12, 2026Malad Valley Marathon Malad City, IDFrom $20Details Sat, Sep 19, 2026Priest Lake Marathon Priest Lake, IDFrom $50Details Sat, Sep 26, 2026St. Luke's FitOne 5K/10K/Half Marathon Boise, IDFrom $35Details Sat, Oct 10, 2026Hayden Lake Marathon Hayden Lake, IDFrom $45Details Sat, Oct 10, 2026Rush Creek Stampede Cambridge, IDFrom $40Details Sun, Oct 11, 2026City of Trees Marathon Boise, IDFrom $55Details Sat, Oct 17, 2026Idaho Running Day Boise, IDFrom $45Details Sat, Oct 24, 2026YMCA Halloween Run Boise, IDFrom $30Details Sat, Oct 24, 2026Haunted Half Marathon and 5k by Run the Undergrad Rexburg, IDFrom $10Register Sat, Oct 24, 2026Eternal Surrender Half Marathon Coeur D Alene, IDFrom $35Register Sun, Oct 25, 2026Halloween Hustle Coeur d'Alene, IDFrom $30Details
How we calculate these stats: RunSesh calculates these figures from the most recent published results of past editions, sourced from RunSignup. We show aggregates only: field size, winning and median times, and the cutoff. We never publish individual finisher tables. Last updated Jul 27, 2026.
Common Questions About Running a Half Marathon in Idaho
When are most Half Marathon races held in Idaho?
October is the busiest month for Half Marathon races in Idaho, with 8 of the 17, followed by September with 3. If you are flexible on the date, that is the quickest way to narrow things down.
How much do Idaho Half Marathon races cost?
Entry fees for Half Marathon races here run from $10 to about $75, depending on the event and how early you register.
How early should I register for a Half Marathon in Idaho?
10 of the 17 Half Marathon races in Idaho already have a price increase scheduled, so entry gets more expensive the longer you leave it. Race pricing almost always steps up as the date approaches, and signing up early is usually the cheapest option.
Are Idaho Half Marathon races beginner-friendly?
Yes, for the most part. Across the 8 Half Marathon races in Idaho with published results, the typical median finish is around 2:16:34, which means half of every one of those fields came in slower than that. Recreational runners and walk-runners are the bulk of these fields, not the exception.
Are there trail Half Marathon races in Idaho?
Yes, 2 races around Idaho get you off the pavement: 1 is a trail race, and 1 mixes road and trail. Surfaces are not always published, so it is worth checking a specific race before you register.