The 2023 APC United Late Model championship kicks off on the Victoria Day weekend at Sunset Speedway with a race called the Dayco Spring Fling 150. In early June, the teams make the first of two stops at Flamboro Speedway for the Flamboro 100. In the middle of June, the Peterborough 100 is held at Peterborough Speedway. On the Canada Day weekend, drivers compete at Delaware Speedway during the Canada Day 100. The next race sees the championship make its final appearance at Flamboro Speedway for the London Recreational Racing 100. The Mid-Summer Classic 150 is conducted in early August at Sauble Speedway. Round seven called the Sunset 100, will take place at Sunset Speedway. The penultimate event of 2023 is at Sauble Speedway. Titles are determined on September 23rd at Delaware Speedway.

The series rules remain unchanged from last season, with the cars constructed to specifications and controls common to most stock car series. The chassis is a tube frame covered with fiberglass bodies. A car can weigh as much as 2800-lbs depending on the engine choice. Crate motors from General Motors (GM 604 & GM 602) and Ford (347) are used in the series. Competitors use a spec tire from American Racer and Bilstein A2 shock absorbers to regulate expenses. There are also rules restricting the options for transmissions, ignition components, body material, brakes, etc.

To determine the starting order of the race, drivers participate in a qualifying session. The five fastest qualifiers selected starting positions one through five during a random draw. Before each race, the cars receive a technical inspection and are impounded until the start of the event.

A new restart procedure was introduced this year by series officials for the APC United Late Model and Qwick Wick Super Stock divisions called the 'choose rule.' On restarts, competitors are allowed to choose their lane. Their selection may be determined by the condition of the track, how many cars are ahead of them or the handling of their vehicle. If a driver changes their choice after the designated 'choose spot,' they must start from the rear of the field.

Also new for this season is the NTN BCA Bearings Triple Crown. Three marquee events, held at Sunset Speedway, Sauble Speedway and Delaware Speedway, will be 150-lap contests in contrast to the standard event, which is 100-laps. The three-race mini-series has a prize fund of $15,000. First place pays $3,500, second $2,500, third $2,000 and fourth thru tenth $1,000.

Round two of the 2023 APC United Late Model Championship for Pro Late Models was held at Flamboro Speedway. Drivers would compete in the Grisdale Racing Products 100, a one-hundred-lap contest around the 0.333-mile asphalt oval.