Boise River Marathon

Boise River Marathon 2026 Course Analysis

Boise River Marathon is a full marathon held in Boise, United States of America, scheduled for Saturday 2 May 2026. The course is run on road surface with 0m of total elevation gain, reaching a maximum altitude of 0m above sea level.

Elevation Profile

This is a very flat course with only 0m of total elevation gain across the full distance. The course ranges from 0m to 0m above sea level — a 0m 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 May, the expected race day conditions are as follows. Moderate temperatures between 14°C and 27°C are expected. While comfortable for most runners, those targeting fast times should pay attention to hydration, as these temperatures can impact performance over the full distance. There is a low chance of rain (1%), so dry conditions are likely.

Surface Type: Road

Boise River 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 Boise River Marathon?

Our difficulty rating for Boise River 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 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 Boise River Marathon against other marathons to find the right race for your goals.