Tim Twietmeyer (born November 30, 1958) is an Auburn, California-based ultramarathon runner and an engineering manager at Hewlett Packard, in Roseville in the U.S. state of California. Twietmeyer is also an accomplished mountain biker, road cyclist, and retired almost-scratch golfer and swimmer. He is best known for his five victories and unprecedented 25 sub-24 hour finishes at the 100-mile (160 km) Western States Endurance Run.
Western States 100 Miler
Twietmeyer is the only person to have completed the Western States Endurance Run more than 25 times in under 24 hours. His five WS100 victories came in 1992, 1994–1996, and 1998. In 2003, he completed an unprecedented 15 consecutive top-five finishes. His time of 17:17 is the Western States masters division (over 40 years of age) course record.
He has served for 10 years on the board of trustees and is the current president of the Western States Endurance Run Foundation.
Beyond his WS100 exploits, Twietmeyer has won the Eagle 100-mile (160 km) Run in Canada, and completed the Ultra Trail du Mont Blanc through France, Italy, and Switzerland. He has completed over 200 marathon and ultramarathon races.
- Western States 100: five-time champion; fifteen top-five finishes; master’s division course record holder (17:17); 25 sub-24-hour finishes
- First runner to complete the Tahoe Rim Trail (165 miles) in under two days
- 21-time finisher of the American River 50 Mile Run
- 29- time finisher of the California International Marathon
- 1997 champion and course record holder of The Eagle 100-Mile Run, Penticton, British Columbia
- Winner of several 50-mile and 50-kilometer races, including the Jed Smith 50K and Pueblo Nuevo 50-Miler
- Seven wins at the California 50-Mile Endurance Run
Tim and his wife, Kathy, have three sons.