Date
May 17, 2026
Field Size
Large (2,000 - 9,999)
PR Score
92.8 / 100
BQ Rate
3.6%
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PR Score of 92.77 indicates a moderately challenging course with rolling hills that may impact pacing.
BQ rate of just 3.6% reveals that only a small fraction find the elusive Boston qualification here.
A total of 2,276 finishers in 2023 signifies a sizable field, providing ample camaraderie and competition.
The course includes several scenic sections through Denver, including the iconic City Park and views of the Rocky Mountains.
Almost 2,300 runners crossed the finish line at the Colfax Marathon in 2023, making it a lively but manageable event. Set against the backdrop of Denver's unique urban landscape, the course features rolling hills that keep you engaged throughout the run. Many participants appreciate the energetic atmosphere, particularly around the course’s scenic lakes and parks, which add to the experience despite the elevation gains.
Colfax Marathon is an Emerging BQ venue — a legitimate qualifier for committed runners, though BQ rates are still building as the race grows. Historically, around 3.6% of finishers have posted Boston-qualifying times here. The course profile rewards runners who execute a well-paced effort from the start.
Focus on maintaining a steady effort through the rolling hills, conserving energy on the downslopes while managing your pace on the climbs. Aim to hit negative splits in the second half once you've settled into your rhythm, as the course's later miles may provide opportunities to pick up the pace.
No elevation data was found in the course profile file.
Historical average based on 3-year data for this race date
Temp
77.3°F / 46.1°F
Conditions
Partly Cloudy
Precipitation
0.01 in
Wind
9.9 mph
Historical averages · Source: Open-Meteo · Actual conditions will vary
Typical conditions: Cool to mild (45–65°F), variable conditions. Spring race-day temperatures can shift quickly — check the forecast in the week before and plan your kit for a range of conditions.
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