At Colfax, we run a 42.2 km city loop through a fire station, Empower Field twice, Sloan's Lake, downtown, and seven miles beside water. The hills are manageable; the constant 1,600 m altitude is the quieter tax. Registration opens in August, with entry still estimated near $180. Partners can use transit and meet us repeatedly, then recover in City Park instead of chasing a point-to-point course.
Better info coming — we're still verifying 6 fields on this race.
Why we'd pick it
- The 190 m climbing estimate is useful for planning, not a verified pacing number.
- Open · Direct entry — no lottery to lose.
- A non-racing partner gets a real weekend here — 5/5.
- Race day usually sits 7–21°C, about 25% chance of rain.
The course
The marathon starts and finishes at Ferril Lake in City Park, crosses downtown, runs through Denver Fire Station 1 and Empower Field twice, then reaches Sloan's Lake and Lakewood before returning along river and bike paths. The profile is moderate, but every kilometer is near 1,600 m above sea level and the late climb back toward City Park arrives after 35 km.
