
Boise, United States of America · Sunday 11 October 2026
The City of Trees Half Marathon takes place in Boise, the capital city of Idaho. The course takes runners through tree-lined streets, along the Boise River Greenbelt, and past historic neighborhoods. The route is mostly flat, with a few gentle inclines, and offers participants the opportunity to run through the city’s beautiful parks and natural spaces. After the race, runners can enjoy downtown Boise, visit the Idaho State Capitol, or explore Bogus Basin for hiking and mountain biking.
Adjusted Time
1:42:21
Time difference: -2.6 minutes compared to a flat, road, temperate course.
On our difficulty model, City of Trees Half Marathon plays about even with an average road half marathon for a 1:30 runner. It ranks #397 hardest of 450 half marathons we analyse, and #133 of 145 in United States of America. Use the calculator above to see the exact adjusted time for your own goal pace.
Estimated finish times on this course versus the same effort on an average road half marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On City of Trees Half Marathon | Difference |
|---|---|---|
| 1:30:00 | 1:27:30 | −02:30 |
| 1:45:00 | 1:42:21 | −02:39 |
| 2:00:00 | 1:57:12 | −02:48 |
| 2:15:00 | 2:12:02 | −02:58 |
| 2:30:00 | 2:26:51 | −03:09 |
| 2:45:00 | 2:41:39 | −03:21 |
| 3:00:00 | 2:56:26 | −03:34 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
City of Trees Half Marathon is a half marathon held in Boise, United States of America. It is scheduled for Sunday 11 October 2026. The course is run on road surface with 60m of total climbing, with its high point near 875m above sea level. For registration and full race details, visit the official City of Trees Half Marathon website.
This is a very flat course, with only 60m of total climbing and little change in altitude throughout. Flat profiles let you hold an even pace from start to finish, which makes this a fast, PB-friendly race.
Based on historical weather data for October, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 9°C to 17°C. This temperature range is widely considered optimal for marathon performance, allowing efficient heat dissipation without cold-related issues. There is a low chance of rain (10%), so dry conditions are likely.
City of Trees Half Marathon is run on road surfaces, which provide the fastest and most predictable conditions for racing. Road courses allow for consistent pacing and are typically the best choice for a personal best.
Looking for an easier marathon or a tougher challenge? You can also compare City of Trees Half Marathon against other half marathons to find the right race for your goals.
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