If you love data and tradition, the BOLDERBoulder 10K is your happy place. Since 1979, the race has been staged 45 times and has welcomed 1,500,095 people to the finish line on the campus of the University of Colorado. And here’s the truly singular part: it’s believed BOLDERBoulder is the only road race in the U.S. – and possibly the world – that maintains historical single-age all-time Top-20 lists.
The lists can be found here.
The single-age lists reveal the many ways people thrive at BOLDERBoulder—early breakthroughs, late-career resurgences, and long-arc consistency. They’re a time-capsule of the event’s competitive spirit, capturing performances from first-timers to age-group legends every year.
Who shows up the most?
These athletes appear the most times across all single-age Top-20 lists:
- Dave Dooley — 32 appearances
- Doug Bell — 24 appearances
- Libby James — 22 appearances
- Don Larson — 20 appearances
- Laura Bruess — 19 appearances
The longest careers on the lists
- Women: The widest career footprint belongs to Ellen Hart, spanning 44 years from her first appearance in 1981 (age 23) to her most recent in 2025 (age 67).
- Men: The longest spans are 34 years, shared by:
- Dave Dooley, who first appeared in 1990 (age 43) and most recently in 2024 (age 77).
- Verne Carlson, who first appeared in 1983 (age 50) and most recently in 2017 (age 84).
Who rules the No. 1 spot?
- Men’s #1 powerhouse: Doug Bell with 11 No. 1 rankings; runners-up: Jose Cardenas (8), Ray Schramm (6), Jesse Aweida (5)
- Women’s #1 powerhouse: Libby James with 10 1 rankings; runners-up: Ellen Hart (6), Colleen De Reuck (4)
The oldest single-age records
Some records from the early years of BOLDERBoulder remain unmatched:
- Mark Scrutton ran 29:38 in 1981 as a 20-year-old, a mark that still stands as the oldest men’s single-age record.
- Ellen Hart clocked 34:53 in 1981 at age 23, giving her the distinction of holding the oldest women’s single-age record
New Additions in 2025
In 2025, 204 new performances were added to the single-age Top-20 lists. Among them, 13 athletes etched their names into history by setting new single-age records:
- Rainer Young (age 9 Men) – 41:03
- Andy Wacker (age 36 Men) – 30:32
- Emma Kenyon (age 37 Women) – 35:48
- Frank Zoldak (age 58 Men) – 35:51
- Kristine Clark (age 62 Women) – 42:43
- Jay Littlepage age 65 Men) – 40:35
- Roger Sayre (age 67 Men) – 40:23
- Doug Bell (age 74 Men) – 46:46
- Tom Lemire (age 81 – Men) – 56:35
- Dennis Muirhead (age 84 Men) – 59:21
- Constance Ahrnsbrak (age 85 Women) – 1:16:22
- Jesse Aweida (age 94 – Men) – 2:11:20
- Ray Schramm (age 98 – Men) – 1:58:48
Peak years of excellence
The single year with the most performances captured in the all-time age lists is 2025 with 204 entries.
From Memorial Day traditions to lifelong goals, the single-age Top-20 lists are a uniquely BOLDERBoulder way to celebrate endurance, community, and the joy of racing in Boulder. See you on the start line next year.