Race Day Weather
61°
86° high
Light
Dry
Warm day, plan for hydration
Runners will face temperatures rising from 62°F at the start to 86°F by the finish. With a light wind from the ESE at 6 mph, hydration will be essential, especially as humidity hovers around 40%. Runners should consider starting conservatively to manage the increasing heat throughout the race.
Race day forecast available in 131 days
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Distance: 26.2mi
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This amazing run course will take you alongside the Boulder Reservoir, remaining mostly on dirt roads and trails. The course is flat with only 200 feet of gain, and will provide views of the Boulder Reservoir and Rocky Mountains. Source
FAQ
When is the 2026 Boulder Rez Marathon?
The 2026 Boulder Rez Marathon will be held on Saturday August 15, 2026.
Is the Boulder Rez Marathon a Boston Marathon Qualifier?
Yes, the Boulder Rez Marathon is an official Boston Marathon qualifier.
What will the weather be like for the 2026 Boulder Rez Marathon?
The forecast calls for a high of 86°F and a low of 61°F with a 0% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.
