RunRace USA › Idaho › Boise › City of Trees Marathon
City of Trees Marathon
Boise, Idaho · Sunday, October 11, 2026 · Marathon, Half Marathon, 10K, 5K
Official race page & registration ↗City of Trees Marathon takes place on Sunday, October 11, 2026 in Boise, Idaho. The race offers 4 distances: Marathon, Half Marathon, 10K, 5K. For anyone travelling in, Meridian is about 10 miles away.
It is one of 27 races on the Idaho calendar that October. At $20, entry sits below the $35 median for a US marathon.
- Date
- Sunday, October 11, 2026
- Location
- Boise, Idaho
- Distances
- Marathon, Half Marathon, 10K, 5K
- Entry fee
- from $20
Listing from the 2026 race calendar, refreshed nightly. Details can change: confirm date and entry on the official race page before travelling. Spot an error? Tell us here.
Making a race weekend of it?
Stay near the start line in Boise: check in Oct 10, out Oct 12.
Common questions
When is City of Trees Marathon?
City of Trees Marathon is scheduled for Sunday, October 11, 2026.
Where is City of Trees Marathon held?
City of Trees Marathon is held in Boise, Idaho. It is about 10 miles from Meridian.
What distances does City of Trees Marathon offer?
The listed distances are Marathon, Half Marathon, 10K, 5K.
How much does City of Trees Marathon cost?
Entry is listed from $20. Check the official race page for the current price, which usually rises closer to race day.
How do I register for City of Trees Marathon?
Registration is handled on the official race page, linked at the top of this listing. Entry can close early if the race sells out.
More races nearby
- Oct 17Idaho Running DayBoise, ID
- Oct 17WIINing Warriors Flock WalkBoise, ID
- Oct 4SueB 5kBoise, ID
- Oct 4YMCA Harrison Classic Kids Run presented by Blue Cross of IdahoBoise, ID
- Oct 102026 Angel Dash - Idaho Falls, IDIdaho Falls, ID
See every race on the Idaho calendar, all Boise races, Idaho Marathons, Idaho Half Marathons, or use the Race Finder for maps and filters.