When in October are most 5K races held?
The busiest weekend in Idaho is October 24 and October 25, with 4 5K races on those two days, and the single busiest day is Saturday, October 24 with 3. Every one of them is on a Saturday or a Sunday.
Race calendar · October 2026 · Idaho
October 2026 5K Races in Idaho
Every 5K in Idaho in October 2026, all 12 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
12 5K races in October 2026
When in October
The October Race Weekends
5K races do not spread evenly across October. The busiest weekend is October 24 and October 25, with 4 of them.
By the numbers
The Biggest and Longest-Running
The October 5K races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
October 5K Races by City
Soonest 5K Races in October
12 total Sat, Oct 3, 2026Outside With Pride 5K Boise, IDFrom $30Details Sun, Oct 4, 202610th Annual Meridian, ID Ostomy 5k Meridian, IDFrom $35Details Sun, Oct 4, 2026SueB 5k Boise, IDFrom $35Details Sat, Oct 10, 2026Hayden Lake Marathon Hayden Lake, IDFrom $55Details Sat, Oct 10, 2026Rush Creek Stampede Cambridge, IDFrom $40Details Sun, Oct 11, 2026City of Trees Marathon Boise, IDFrom $20Details Sat, Oct 17, 2026Idaho Running Day Boise, IDFrom $50Details Sat, Oct 17, 2026Greek 5K Boise, IDFrom $29Details Sat, Oct 24, 2026Trick or Trot Boise, IDFrom $25Details Sat, Oct 24, 2026YMCA Halloween Run Boise, IDFrom $30Details Sat, Oct 24, 2026Haunted Half Marathon and 5k by Run the Undergrad Rexburg, IDFrom $10Details Sun, Oct 25, 2026Halloween Hustle Coeur d'Alene, IDFrom $30Details
Common Questions About Running an October 5K in Idaho
When should I sign up for an October 5K?
As early as you can. 4 of these October 5K races already have a price increase on the calendar, and 12 are open for entry right now.
How much does an October 5K cost to enter?
The typical entry is $30, with paid entries running from $10 up to $55. Entry fees climb as race day gets closer, so the same race is usually cheapest the week it opens.
5K Races in Other Months
September and November sit either side of October, which is where most people look next when a date does not fit.