In 2012, at nine years old, Retzlaff competed in the Wisconsin Junior Sprints, where he won the mid-season championship. He competed in the Wisconsin Bandolero Series in 2013, finishing 3rd in points, and winning the championship a year later. He would rank 2nd in state points from 2015 to 2016.
He ran full-time in the ARCA Midwest Tour in 2017, where he ranked 14th in points and ranking 2nd in the Midwest Truck Series asphalt trucks. And for 2018, he finished sixth in the overall standings of the Midwest Truck Series.[1][2]
In 2020, Retzlaff would sign with Cook-Finley Racing full-time, driving in the No. 42. He earned 5 top 10s, and one top 20, finishing 4th in the standings.[6]
He would return to Cook-Finley Racing in 2021 but only ran for a partial schedule. He would finish 4th at the Southern National Motorsports Park, making it his best career ARCA Menards Series East finish. Retzlaff made his ARCA Menards Series debut in 2020 for CFR, driving in paired events with the East series. His best finish of the season was 8th at Toledo Speedway. He returned in 2021, driving in the paired East series race at the Milwaukee Mile. He would finish 11th.
On December 3, 2021, Retzlaff would sign with RSS Racing for a part-time effort in the 2022 NASCAR Xfinity Series, driving the No. 38. He hopes to have a full-time program in 2023.[7] At the 2022 United Rentals 200, his first start, Retzlaff would qualify an impressive 6th. He quickly fell back after the first restart. A fuel pump issue would end Retzlaff's race on lap 158, finishing 36th. He would score his best career finish at the 2022 ToyotaCare 250, after starting and finishing the race in 10th.[8] On September 15, 2022, it was revealed that Retzlaff and RSS Racing had mutually parted ways. On September 20, it was announced that Retzlaff would drive the No. 02 for Our Motorsports at the Texas fall race.[9]
2023
On January 4, 2023, Jordan Anderson Racing announced that Retzlaff will drive their No. 31 car full-time for the 2023 season.[10] In the season-opener race at Daytona, Retzlaff earned a career-best 4th place finish.[11] Overall, Retzlaff scored no wins, one top five, and seven top tens with an average finish of 17.9 and finished 16th in the standings.
2024
On November 2, 2023, it was announced that Retzlaff will return to JAR for the 2024 season.[12]
Retzlaff scored his and JAR's first career poles at Richmond and at Martinsville.
On November 14, 2024, Retzlaff announced that he would not return to JAR.[13]
2025
On December 18, 2024, it was announced that Retzlaff would move to Alpha Prime Racing, competing in the No. 4 Chevrolet.[14]
^Persike, Eileen (January 26, 2021). "Racing toward his goal". starjournalnow.com. Archived from the original on January 13, 2022. Retrieved January 13, 2022.
^Konenski, Austin (September 26, 2022). "Twitter post". Twitter. Retrieved September 26, 2022. Parker Retzlaff will drive the No. 20 truck for Young's Motorsports in this weekend's NASCAR Truck Series race at Talladega Superspeedway. It would be Retzlaff's Truck Series debut and first superspeedway event.
.jpg)
