BD
Boulderthon: Downtown Boulder Marathon
Race Date
Sep 27, 2026
Location
Boulder, CO
Course Info
USATF CertifiedTerrain
road
Elevation Gain
0'
Net Drop/km
-0.24 m
Separation
1.3%
Also Offers
26.2M10K5K run | kids run
USATF Certified Course
CO25005DT · Boulderthon Half Marathon
Relatively flat with minimal net elevation change. Loop course — start and finish are close together.
Race Day Weather
5-year historical avgStart (Low)
48°
Afternoon (High)
77°
Warm — hydration strategy is key, start conservatively
0.0"
Precipitation
9 mph
Wind
47%
Humidity
Explore More Journeys
Can't make it to Boulder? Discover other experiences that match your running style.
Search All Races
