She started racing in 1991 at Lakeside Speedway.
Her father, Joe Cobb, races at Lakeside Speedway in the modified division.
Since 2002, she has made 9 starts in the ARCA Racing Series, including 3 top-10s in 3 starts in 2004 while driving for Keith Murt.

In 2004, Cobb made her NASCAR debut in the Busch Series at Homestead-Miami Speedway.
She drove the No.
50 Vassarette Chevrolet for Keith Coleman Racing and finished 43rd due to a crash on lap 2.

In 2006, Cobb created a line of clothing for female race fans called Driver Boutique.
 Proceeds from the sales of this line go towards her racing efforts, and she has attempted to qualify for various Busch and ARCA races in 2007 with the Driver Boutique sponsorship.

On July 19, 2008, she competed in the Camping World Truck Series event at the Built Ford Tough 225.
 She started in 35th and finished 26 driving the No.
74 Dodge for The Annexus Group completing 144 laps.
On April 27, 2009 she competed at the O'Reilly Auto Parts 250 driving the No.
73 Dodge for Derrike Cope Inc. She started 34th and completed 72 laps before experiencing engine trouble, finishing 26th out of 35 drivers winning a purse of $10,680.

In 2010, Cobb announced that she would run full-time in the truck series, after purchasing the assets of the No.
10 truck team from Rick Crawford, whose Circle Bar Racing downsized from a two-truck operation to one — Crawford's own No.
14 (which would also close down early in the season).
Cobb kept the same truck number and owner points from Circle Bar.
Also that year, Cobb became the highest female points finisher in history in any of the three major NASCAR Series to that time, achieving 17th place.

For 2011, Cobb continued racing her own No.
10 truck full-time in the Camping World Truck Series, and also drove the first 5 races in the Nationwide Series in the No.
79 for 2nd Chance Motorsports.
On the truck side, Cobb became the highest finishing female in Truck Series history by finishing 6th at the 2011 NextEra Energy Resources 250.
She would hold this record for nine years, when Natalie Decker broke the record with a fifth-place finish, also at the season-opening Daytona race, in 2020.
Cobb later announced that she would run the full season with 2nd Chance Motorsports in their No.
79 Ford and run for Rookie of the Year.
Cobb later gave her truck's owners points to Chase Mattioli and his team while she also started her own driver development program with Cody Cambensy planning to drive in the Truck Series in 2011.
She later left 2nd Chance Motorsports after a dispute with owner Rick Russell over whether to start and park after losing their second car at Las Vegas, where she confirmed she is not a start and park driver.
Rick Ware Racing later gave her a ride in the No.
41.

In early 2011, Cobb for her own team called Jennifer Jo Cobb Racing and partnered with U.S. Army Family and MWR Command to launch Driven 2 Honor, a promotion honoring women in the U.S. Military.
Jennifer hosted 2 female service members and their guests at the first 5 Nationwide races of the 2011 NASCAR season.

In 2012 Cobb ran the entire Camping World Truck Series schedule in the No.
10, along with selected Nationwide Series races in the No.
13.
She returned to the Camping World Truck Series for 2013.

On May 15, 2013, her team's hauler (which was formerly owned by Circle Bar and purchased by Cobb when she bought the No.
10 truck from them) and some other various equipment was stolen by fellow driver and team owner Mike Harmon, who Cobb previously was a driver for part-time in the Xfinity Series in 2007 and 2009.
Although Harmon stated that he was innocent, he was arrested and charged with stealing this equipment since they belonged to Cobb.
Harmon stole those items in association with his sister and Dave Novak, a former partner in the ownership of Cobb's team who later moved over to Harmon's team.
On May 28, officials from the Rowan County Sheriff's Office seized five Camping World Truck Series trucks and two Nationwide Series cars, which were stated as belonging to Cobb, from Harmon's garage.

For the 2014
She started racing in 1991 at Lakeside Speedway. Her father, Joe Cobb, races at Lakeside Speedway in the modified division. Since 2002, she has made 9 starts in the ARCA Racing Series, including 3 top-10s in 3 starts in 2004 while driving for Keith Murt.
In 2004, Cobb made her NASCAR debut in the Busch Series at Homestead-Miami Speedway. She drove the No. 50 Vassarette Chevrolet for Keith Coleman Racing and finished 43rd due to a crash on lap 2.
In 2006, Cobb created a line of clothing for female race fans called Driver Boutique.  Proceeds from the sales of this line go towards her racing efforts, and she has attempted to qualify for various Busch and ARCA races in 2007 with the Driver Boutique sponsorship.
On July 19, 2008, she competed in the Camping World Truck Series event at the Built Ford Tough 225.  She started in 35th and finished 26 driving the No. 74 Dodge for The Annexus Group completing 144 laps. On April 27, 2009 she competed at the O'Reilly Auto Parts 250 driving the No. 73 Dodge for Derrike Cope Inc. She started 34th and completed 72 laps before experiencing engine trouble, finishing 26th out of 35 drivers winning a purse of $10,680.
In 2010, Cobb announced that she would run full-time in the truck series, after purchasing the assets of the No. 10 truck team from Rick Crawford, whose Circle Bar Racing downsized from a two-truck operation to one — Crawford's own No. 14 (which would also close down early in the season). Cobb kept the same truck number and owner points from Circle Bar. Also that year, Cobb became the highest female points finisher in history in any of the three major NASCAR Series to that time, achieving 17th place.
For 2011, Cobb continued racing her own No. 10 truck full-time in the Camping World Truck Series, and also drove the first 5 races in the Nationwide Series in the No. 79 for 2nd Chance Motorsports. On the truck side, Cobb became the highest finishing female in Truck Series history by finishing 6th at the 2011 NextEra Energy Resources 250. She would hold this record for nine years, when Natalie Decker broke the record with a fifth-place finish, also at the season-opening Daytona race, in 2020. Cobb later announced that she would run the full season with 2nd Chance Motorsports in their No. 79 Ford and run for Rookie of the Year. Cobb later gave her truck's owners points to Chase Mattioli and his team while she also started her own driver development program with Cody Cambensy planning to drive in the Truck Series in 2011. She later left 2nd Chance Motorsports after a dispute with owner Rick Russell over whether to start and park after losing their second car at Las Vegas, where she confirmed she is not a start and park driver. Rick Ware Racing later gave her a ride in the No. 41.
In early 2011, Cobb for her own team called Jennifer Jo Cobb Racing and partnered with U.S. Army Family and MWR Command to launch Driven 2 Honor, a promotion honoring women in the U.S. Military. Jennifer hosted 2 female service members and their guests at the first 5 Nationwide races of the 2011 NASCAR season.
In 2012 Cobb ran the entire Camping World Truck Series schedule in the No. 10, along with selected Nationwide Series races in the No. 13. She returned to the Camping World Truck Series for 2013.
On May 15, 2013, her team's hauler (which was formerly owned by Circle Bar and purchased by Cobb when she bought the No. 10 truck from them) and some other various equipment was stolen by fellow driver and team owner Mike Harmon, who Cobb previously was a driver for part-time in the Xfinity Series in 2007 and 2009. Although Harmon stated that he was innocent, he was arrested and charged with stealing this equipment since they belonged to Cobb. Harmon stole those items in association with his sister and Dave Novak, a former partner in the ownership of Cobb's team who later moved over to Harmon's team. On May 28, officials from the Rowan County Sheriff's Office seized five Camping World Truck Series trucks and two Nationwide Series cars, which were stated as belonging to Cobb, from Harmon's garage.
For the 2014 
Jennifer Jo Cobb