Boise Half Marathon
Nov 14Boise, IDHalf Marathon
1 mi from City of Trees Marathon, by SoleKIDs, registration open
City of Trees Marathon
At a glance
- Last held
- Oct 3–11, 2026
- Next edition
- 2027 date not announced. Usually held in October.
- Location
- Boise, Idaho
- Distances
- Marathon, Half Marathon, 10K, 5K
Listed from RunSignUp. Checked Oct 12, 2026.
Plan this race for free
Aid stations, cutoffs and pacing in one plan, with the timeline your crew follows. Crew invites and race-day updates come with a Race Pass.
Build my planAbout this race
Sunday, October 11, 2026
Course Maps will be updated once details have been finalized.
GREAT SWAG and T-SHIRT DEADLINE
Participant T-shirt and 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.
Key dates
Registration opens
Nov 19, 2025
Tier 1 ends
May 1, 2026
Tier 2 ends
Jun 1, 2026
Tier 2 ends
Jul 1, 2026
Tier 3 ends
Jul 1, 2026
Tier 4 ends
Aug 1, 2026
Tier 3 ends
Sep 1, 2026
Tier 5 ends
Sep 1, 2026
Standard ends
Sep 30, 2026
Race day
Oct 3, 2026
Tier 6 ends
Oct 4, 2026
Standard ends
Oct 10, 2026
Registration closes
Oct 11, 2026
Tier 4 ends
Oct 11, 2026
Tier 7 ends
Oct 11, 2026
Pricing
10k
Tier 4 ended Oct 11, 2026
See registration
5k
Tier 4 ended Oct 11, 2026
See registration
Half Marathon
Tier 7 ended Oct 11, 2026
See registration
Marathon
Tier 7 ended Oct 11, 2026
See registration
SoleKIDs 5K
Standard ended Oct 10, 2026
See registration
Virtual - any distance!
Standard ended Sep 30, 2026
See registration
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Registration openings and major changes, like a new date or a cancellation.
Entry transfers
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