Stefan began racing at age 12 after his father Phil received encouragement from Ken Ragan.[1]
CARS Late Model Stock Tour
Parsons began racing in the CARS Tour in 2015, where he drove the No. 98 Ford for his father's team, Phil Parsons Racing, in five of the races.
He returned to the car in 2016, this time participating in eight of the ten races and finishing 12th in the overall points standings.
In 2017, Parsons drove the same car in six races, though the last one was in the No. 55 Ford.[2]
Craftsman Truck Series
Parsons made his NASCAR debut in the Truck Series in 2018, where he drove the No. 15 Chevrolet Silverado for Premium Motorsports at Bristol. He finished 17th after starting 30th.[3][4] He would later return to the team for the Phoenix race, where he finished 20th after starting 24th.
Parsons returned to CMI in 2020, driving a second No. 83 truck at Las Vegas.[7]
After not running any Truck Series races in 2021, Parsons returned to the series in 2022 in the race at Sonoma as a last-minute replacement driver for G2G Racing. Mason Filippi and Travis McCullough were both scheduled to attempt to make their Truck Series debuts at Sonoma in the team's Nos. 46 and 47 trucks, respectively.[8] However, on June 10, McCullough had to be replaced due to his drug test results not coming in in time for practice. (As it was his first start of the season, he had to take a drug test beforehand.) Parsons was announced as McCullough's replacement in the No. 47 truck for qualifying.[9] However, on June 11, the team decided to move Parsons from the No. 47 and replacing McCullough to the No. 46 and replacing Filippi in qualifying and the race due to Filippi not adjusting to the truck well enough in practice. The No. 47 truck was withdrawn.[10] Parsons then drove the No. 20 for Young's Motorsports in the races at Nashville and Homestead-Miami.
In 2023, Parsons returned to Young's Motorsports to practice and qualify their No. 12 truck for the race at Circuit of the Americas after Spencer Boyd was late to arrive at the track due to his plane flight being delayed. Parsons was able to qualify the No. 12 truck into the race on Friday and Boyd drove it in the race on Saturday. Parsons would then drive the team's No. 20 truck in the Bristol dirt race and their No. 02 truck at Pocono. On October 19, it was announced that Parsons would drive the No. 25 truck for Rackley W.A.R. in the Truck Series season-finale at Phoenix.[11]
Parsons ran nine races in 2020 with a best finish of 18th at Texas Motor Speedway. He returned to BJMM and the No. 99 for another part-time schedule in 2021.[14]
On September 21, 2021, BJMM announced that Parsons would be driving full-time in the No. 99 for the team in 2022, with sponsorship from Sokal Digital and Springrates Automotive.[15] However, he was reduced to an unknown amount of races, including one race in the No. 5 car, due to the No. 78 taking owner points from the No. 99. In addition, he would compete in Alpha Prime Racing's No. 45 for an excessive amount of races, which would be the first time he drove a team other than McLeod's team since 2019, in which he drove for JD Motorsports.
In 2023, Parsons would run part-time in the Xfinity Series again, primarily driving for SS-Green Light Racing. However, he did still run two races for APR, the season-opener at Daytona in the No. 45 as a replacement for co-owner Caesar Bacarella who got sick after qualifying,[16] and at Watkins Glen in the No. 44.
In 2024, Parsons competed for Alpha Prime at Bristol night race, driving the No. 45 Chevrolet.[17]
^"(Twitter post)". Twitter. Mark Kristl. June 4, 2022. Retrieved June 22, 2022. Tim Viens tells me that Mason Filippi & Travis McCullough will pilot the @g2g_racing trucks at Sonoma Raceway. Brennan Poole is driving today to help with points. Viens himself intends on driving at Pocono Raceway & other races later in the season.
^"(Twitter post)". Twitter. Brock Beard. June 11, 2022. Retrieved June 22, 2022. More updates from @g2g_racing - @StefanParsons_ will run the No. 46 in place of Mason Filippi. The No. 47 was already withdrawn yesterday. (...) Team said he wasn't fully adjusting to the difference between the XFINITY car and the Truck. Parsons was available to help as he was spotting for another team.