Denver, CO · May
Colfax Marathon Training Plan
A free 10-mile, half marathon, and marathon plan for the Colfax Marathon, built around the course and your current fitness. Answer four questions and you will see every week of it. No account, no email, no card.
- Distances
- 10 miles, Half marathon, Marathon
- Course
- Flat
- Usually held
- Each May
The Colfax Marathon course
Denver's city marathon, run along Colfax Avenue and through Sloan's Lake, passing through Empower Field at Mile High twice and finishing in City Park. The profile is close to flat by Colorado standards. The altitude, at a little over 5,000 feet, is what makes the race hard for visitors rather than any feature of the course.
Weather on race day
Mid-May in Denver starts cold, often in the 40s, and warms quickly under strong high-altitude sun. Late-season snow and 70-degree afternoons have both happened, sometimes in the same week.
What to train for
Altitude adjustment and sun management for anyone arriving from lower ground. Expect to give up meaningful time per mile compared with a sea-level race, and set the goal accordingly rather than chasing your flat-course pace. Arrive either two days before or two weeks before, not in between.
Registration and official details: Colfax Marathon official site
Colfax Marathon training questions
How long should I train for the Colfax Marathon?
Most runners give a half marathon twelve to sixteen weeks of focused training on top of an existing base. The plan above counts back from your actual race date, so if you have less time than that it builds the best plan the remaining weeks allow rather than pretending you have longer.
Is the Colfax Marathon course hilly?
Flat. Denver's city marathon, run along Colfax Avenue and through Sloan's Lake, passing through Empower Field at Mile High twice and finishing in City Park. The profile is close to flat by Colorado standards. The altitude, at a little over 5,000 feet, is what makes the race hard for visitors rather than any feature of the course.
What is the weather usually like at the Colfax Marathon?
Mid-May in Denver starts cold, often in the 40s, and warms quickly under strong high-altitude sun. Late-season snow and 70-degree afternoons have both happened, sometimes in the same week.
Do I need an account to get a Colfax Marathon training plan?
No. The plan above builds in your browser with no account, no email, and no card. Make a free account only if you want to keep it, log your runs against it, and have the coach keep adapting it as your training goes.
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