City of Trees Marathon
Race Date
Oct 11, 2026
Location
Boise, ID
The Experience
Sunday, October 11, 2026 Course Maps will be updated once details have been finalized. GREAT SWAG and T-SHIRT DEADLINE Comfiest long sleeve t-shirt, swag thanks to our amazing sponsors, and finisher food/drink, all COT runners get a finisher's award. Please note that registrants registering after October 1, 2026 are not guaranteed a shirt. Please note courses utilize the Boise Greenbelt system. Should we run the Greenbelt, the river can be unpredictable. Systems and entities that govern the local Greenbelt are constantly dealing with these challenges. Typical issues are created due to sidewalk construction, sinkholes, flooding, etc. During the run, you may encounter wildlife that may cause a delay in your progress and/or change in your planned route. Or you may cause your own delay to stop and listen to the amazing sounds this course creates.
Logistics
Race Day
Sunday, October 11, 2026
Start Time
8:30 AM
Giveaway
T-Shirt
Start Location
733 S Pioneer Street, Boise, ID, 83702
Course Info
Course Type
Loop Course
Terrain
road
Difficulty
Ultra-Flat
Elevation Gain
0'
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Quality Score
Standout7221 years running
~912 finishers a year
growing or steady
13% returning runners
2 timing sources
runners from 26 states
winner 1:16:38
typical high 69°F
Race Day Weather
5-year historical avgStart (Low)
47°
Afternoon (High)
69°
Pleasant conditions — light layers at start, comfortable by finish
0.0"
Precipitation
11 mph
Wind
50%
Humidity
Historical Finish Times
How 9,652 finishers actually crossed the line across 21 years.
Most recent
2025
Total finishers
9,652
Median time
2:16:34
Latest turnout
715
States
41
Turnout by year
2016–2025
Hover the histogram to inspect specific finish times.
Race Photos
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