Day grew up in a racing family. He began riding dirt bikes competitively at a young age but broke his arm at age nine, ending that chapter of his racing life. He subsequently turned to sprint car racing, beginning in USAC Restricted Micro Sprints in 2016 for his family-owned team. His father, Ronnie Day, was a respected West Coast racing figure.
Over the following years Day built a strong sprint car record. In 2021, he won his first USAC National Midget Series race at Circle City Raceway, becoming the youngest driver to win a USAC National Series event. In 2023 he claimed both the King of the West Sprint Car Series championship and the Make-A-Wish Trophy Cup title. From December 2023 he ran full-time in High Limit Racing for the 2024 season, driving the No. 14 for Jason Meyers Racing and winning at RPM Speedway, Red Dirt Raceway, Riverside International Speedway, I-70 Motorsports Park, and Lake Ozark Speedway, finishing fifth in the standings.
Day's transition to oval stock car racing began in April 2024 when he debuted in late model competition at Hickory Motor Speedway for JR Motorsports, driving the No. 88 Chevrolet. After finishing seventh in the opening feature, he started on the outside pole for the second feature and led nearly every lap to win — his first late model victory in only his second career start.
In July 2024, Pinnacle Racing Group announced Day would contest three ARCA Menards Series races — at Salem, Bristol, and Kansas — with sponsorship from HendrickCars.com. His debut at Salem ended in a late-race incident with Toni Breidinger. At Kansas, controversy arose when Day made contact with Andy Jankowiak on the final lap while both drivers competed in the top five; Jankowiak finished seventh while Day crossed in fourth, prompting a garage confrontation after the race.
Day made his NASCAR Craftsman Truck Series debut at Bristol Motor Speedway in September 2024 for McAnally-Hilgemann Racing, starting 22nd and finishing eighteenth. He ran three additional Truck Series races that season at Kansas, Homestead, and Martinsville, with a best result of sixteenth at Homestead.
On December 6, 2024, Day signed a multi-year contract with Hendrick Motorsports. For 2025 he ran eleven races in the Xfinity Series for HMS in the No. 17 car. On November 7, 2025, it was confirmed that Day would make the step to full-time competition in the now-renamed O'Reilly Auto Parts Series for Hendrick Motorsports in 2026.
He opened the 2026 season with a 27th-place DNF at Daytona. He then strung together eight consecutive top-ten finishes before scoring his first career win at Talladega, followed by a second win at Dover.
Day became the youngest driver to win a USAC National Series event when he took a USAC National Midget win at Circle City Raceway in 2021. His rapid ascent from USAC sprint cars through late models, ARCA, and into NASCAR's top feeder series within approximately two years marked him as one of the more accelerated development trajectories in recent American racing history.
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