In 2005, he came at the World Half Marathon Championships in Edmonton on the 20th Place. In 2006 he was third overall in the half marathon competition of the Houston Marathon U.S. runners over this distance. At the World Cross Country Championships he reached rank 74, and in the autumn he came on his debut over the 42,195 -km distance at the Chicago Marathon on the 20th Place.
The following year he was. During the Pan American Games in Rio de Janeiro over 10,000 m and sixth in the U.S. elimination race for the marathon in the Olympic Games in Beijing Tenth
In 2009 he celebrated his biggest success by winning the Twin Cities Marathon. 2010 was eighth best in Chicago Americans.
Jason Hartmann is coached by Brad Hudson. He holds a degree in education and sociology at the University of Oregon.
- 5000 m: 13:36,33 min, April 21, 2006 Eugene
- 10,000 m: 28:15,22 min, March 31, 2007, Palo Alto
- Half Marathon: 1:03:07 h, January 15, 2006 Houston
- Marathon: 2:11:06 h 10 October, 2010, Chicago