In 1997, Ashburn won the Rookie of the Year award at Highland Rim Speedway and finished fifth in points in the pro-modified series.
Two years later, he won the Most Improved Driver award after winning ten races and finishing fourth in points.
Ashburn made his Busch Series debut in 2003, running a second Day Enterprises car.
Ashburn also made a one-off start for Bost Motorsports, finishing 41st at Michigan Speedway after his Day Enterprises car failed to qualify.
For 2009, Ashburn made only one appearance, parking after five laps in the Stater Brothers 300 at Auto Club Speedway.