The Bolder Boulder is a 10-kilometer road race run every Memorial Day in Boulder, drawing more than 50,000 participants from elite wheelchair athletes to families with strollers. Started in 1979 with about 2,700 runners, it has grown into one of the largest and most acclaimed 10K races in the world.
In 1979, roughly 2,700 people showed up in Boulder to run a new 10-kilometer race on Memorial Day.
Runner's World has named it America's All-Time Best 10K, and it consistently ranks among the top ten largest road races on Earth by field size, a scale almost unheard of for a single-city 10K rather than a marathon
The race finishes inside the University of Colorado's Folsom Field for a citywide Memorial Day Tribute honoring service members who died in the line of duty, folding a genuinely somber civic ceremony into an event that also welcomes costumed joggers and walking families, a combination that has made it as much a community institution as an athletic competition
The Memorial Day Tribute at the finish line is the race's defining tradition
a citywide moment of remembrance for military service members that grounds a mass-participation fun run in genuine civic solemnity
a pairing that has helped the Bolder Boulder become one of the most recognized Memorial Day events in the country
Dates TBA · Usually May
Base the route around Boulder, then leave extra time for temporary streets, queues or late return traffic.
Standard running attire suited to late-May Boulder mornings, which typically start cool and warm quickly; many participants run in costume for fun, so dress ranges from serious racing gear...
For Bolder Boulder, choose safe viewing points, watch weather and leave extra time around starts, finishes or releases.
Choose lodging by the part of Boulder you will actually use, not only by the cheapest room.
Check official or local sources for ticketed areas, paid stands, and same-year access rules.
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Bolder Boulder is listed for Past edition: 25 May 2026. Always re-check the official or local source close to travel.
The festival is listed in Boulder, United States. The map coordinate is a planning reference, not a guarantee of a ticket gate or exact venue.
One day is the listed festival span. Add time for arrival, local transport, queues, and any route changes during the event.
Official source linked. Eventisimus separates source confidence from travel suggestions, so check final details before booking.
Boulder, CO
Medium: 54000
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