Idaho · Marathon · Half Marathon · 10K
City of Trees Marathon
City of Trees Marathon is a marathon, half marathon, 10K and 5K event held in Boise, Idaho. It was last held on October 11, 2026 and is usually run in October; the next date hasn't been announced yet. About 1,000 runners take part across all distances.
- Usually held
- October
- Location
- Boise, ID
- Field size
- ~1,000 runners
Race details
- Last held
- October 11, 2026
- Usually held in
- October
- Location
- Boise, Idaho
- Distances
- Marathon, Half Marathon, 10K, 5K
- Field size
- About 1,000 runners
- Course
- Flat (Boise Greenbelt)
- Registration
- runsignup.com
- Official website
- cityoftreesmarathon.com
Registration, course & weather
- Registration status
- Registration status as last checked October 5, 2026: open
- Start time
- 8:00 AM MDT
- Course profile
- Out-and-back course; Road surface; Not a Boston qualifier
About the City of Trees Marathon
A flat, fast fall marathon using the tree-lined Boise Greenbelt system, with marathon, half, 10K and 5K options popular for Boston qualifying.
Rankings and notes
- Rankings and awards
- USATF-certified; Boston qualifier on the flat Boise Greenbelt
More marathons in Idaho
Coming up next, by confirmed date.
More races in Boise
More upcoming races in Idaho
-
Endless Trails Series RegistrationsMcCall, IDVirtual virtuosoVirtual long legsIn-person long legsVirtual shorties +2 more
Keep exploring
- All races in Idaho
- 5Ks in Idaho 35 upcoming races
- 10Ks in Idaho 17 upcoming races
- Half Marathons in Idaho 25 upcoming races
- Marathons in Idaho 13 upcoming races
- Running in Boise 19 upcoming races
- 5Ks in the United States 6,000 upcoming races
- 10Ks in the United States 2,572 upcoming races
- Half Marathons in the United States 1,668 upcoming races
- Marathons in the United States 594 upcoming races
- Fall Marathons
- October Marathons
- October races in Idaho
- Marathons in Washington 24 upcoming races
- Marathons in Utah 19 upcoming races
- Marathons in Nevada 14 upcoming races
- Marathons in Montana 11 upcoming races
Guides from the RaceRove blog
- 8 min read How to Choose Your First Marathon A practical checklist for choosing a first marathon based on course, weather, cutoff, travel, field size and support.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- Blog All guides Planning advice for finding, choosing and travelling to races.
City of Trees Marathon: common questions
- When is the City of Trees Marathon?
- The next date hasn't been announced in the listing yet. The race is usually held in October. Check the organiser's website for the official date.
- Where is the City of Trees Marathon held?
- In Boise, Idaho.
- What distances does the City of Trees Marathon offer?
- Marathon, Half Marathon, 10K and 5K.
- How many people run the City of Trees Marathon?
- About 1,000 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the City of Trees Marathon?
- Registration is handled by the organiser at runsignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the City of Trees Marathon?
- Registration status as last checked October 5, 2026: open.
- What time does the City of Trees Marathon start?
- 8:00 AM MDT.
- What is the course like at the City of Trees Marathon?
- Out-and-back course; Road surface; Not a Boston qualifier.
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.