City of Trees Half Marathon

City of Trees Half Marathon 2026 Course Analysis

City of Trees Half Marathon is a half marathon held in Boise, United States of America, scheduled for Sunday 11 October 2026. The course is run on road surface with 60m of total elevation gain, reaching a maximum altitude of 875m above sea level. For registration and full race details, visit the official City of Trees Half Marathon website.

Elevation Profile

This is a very flat course with only 60m of total elevation gain across the full distance. The course ranges from 818m to 875m above sea level — a 57m elevation range that makes it one of the flatter races available. Runners targeting a personal best will appreciate the minimal climbing.

Expected Race Day Weather

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.

Surface Type: Road

City of Trees Half Marathon is run on road surfaces, which provide the fastest and most predictable conditions for marathon running. Road courses allow for consistent pacing and are typically the best choice for runners targeting a personal best time.

How Difficult Is City of Trees Half Marathon?

Our difficulty rating for City of Trees Half Marathon is calculated using a model that combines elevation gain, temperature impact, and surface type. Use the difficulty calculator above to enter your target finish time and see exactly how many minutes this course would add or subtract compared to a perfectly flat, cool, road-based half marathon. Faster runners and slower runners are affected differently by the same course conditions, so the difficulty is personalised to your pace.

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.