The 2025 APC United Late Model championship kicks off on the Victoria Day weekend at Sunset Speedway with a race called the Dayco 100. In early June, the teams make the first of two stops at Flamboro Speedway. In the middle of June, the Spectra Premium 100 is held at Peterborough Speedway. On the Canada Day weekend, drivers compete at Delaware Speedway in the AC Delco 100. The next race sees the championship make its final appearance at Flamboro Speedway for the London Recreational Racing 100. The Mid-Summer Classic 100 is conducted in early August at Sauble Speedway. Teams return to Sauble for round seven, called the Stewarts & Kubota 100. The penultimate event of 2025 is at Sunset Speedway during the Labour Day Weekend. Titles are determined on September 27 at Delaware Speedway during the Castrol Great Canadian 300.

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. Depending on the engine choice, a car can weigh as much as 2800 lbs. 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 in 2023 by series officials for the APC United Late Model and Dayco 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.

The NTN BCA Bearings Triple Crown is returning for this season. The three marquee events are held June 7 at Flamboro Speedway, August 30 at Sunset Speedway, and September 27 at Delaware Speedway. 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 through tenth $1,000.

The 2025 APC United Late Model season ended with the Great Canadian Race Weekend at Delaware Speedway. Drivers competed in a three-hundred-lap contest around Delaware’s ˝-mile semi-banked asphalt oval in an event called the Castrol 300.

Due to the length of the race, yellow periods were scheduled to appear at approximately one-hundred lap intervals to allow the teams to pit and refuel their cars.

In addition to determining this year’s APC United Late Model champion, the event would also decide the NTN BCA Bearing Triple Crown winner.

With a purse of $15,000 to win, the Castrol 300 attracted twenty-seven Late Model competitors.