Canadian Tire Motorsport Park

The circuit was the second purpose-built road race course in Canada, after Westwood Motorsport Park in Coquitlam, British Columbia. It followed airport circuits in Ontario — Edenvale, Port Albert's Green Acres, and Nanticoke's Harewood Acres — as a road racing venue. The track was designed and built in the late 1950s.

The first race on the track was a local event organized by the Oakville Light Car Club in June 1961. On June 25, the venue held its first major race, the Player's 200, a sports car race that drew international drivers. Stirling Moss won the two-heat event in a Lotus 19; second was Joakim Bonnier and third was Olivier Gendebien. At Moss's suggestion, the proposed hairpin was expanded into two discrete corners for greater challenge and spectator interest; the corner is named Moss Corner in his honour — a source of some confusion as the name is often rendered "Mossport." Unlike many historic motorsport venues, Mosport's track layout has remained largely unchanged from its original form.

For 2001, the entire circuit was repaved to meet FIA specifications and widened to 13 m. Drivers were consulted to ensure the character of the original track was preserved; almost all the racing lines were maintained.

Mosport achieved international recognition through a series of sports car races held under the title "Canadian Grand Prix." The success of these events was central to the founding of the Can-Am Series. The Can-Am first visited in its inaugural 1966 season, and Mosport hosted at least one Can-Am event every year of the series' history except 1968. In 1967, Canada's centennial year, Mosport hosted Formula One, USAC, and a 500cc Motorcycle Grand Prix. The Formula One Canadian Grand Prix was held at the circuit in 1961–1967, 1969, 1971–1974, and 1976–1977 before being moved to Montreal.

Mosport has had a succession of owners since the original public company. Two former owners — Norm Namerow, who owned the track through his publishing company CanTrack until his death, and Harvey Hudes — were inducted into the Canadian Motorsport Hall of Fame for their contributions to the sport. In 1998, Panoz Motorsports purchased the facility; in 1999, the newly formed American Le Mans Series visited Mosport for the first time.

Canadian Motorsports Ventures Ltd. (CMV), which includes Orlando Corp. chairman Carlo Fidani and Canadian road racing driver Ron Fellows, purchased the facility in June 2011. In February 2012, a partnership between Mosport and Canadian Tire was announced, including the renaming of the track to Canadian Tire Motorsport Park.

In spring 2000, Mosport opened the Driver Development Centre, a 1.7 km, 12-turn training circuit designed specifically with fewer guardrails, walls, and blind corners. The course was designed by the owners and instructors of the Bridgestone Racing Academy. Due to significant scheduling demands on the main circuit, the original academy course was reconstructed and lengthened in autumn 2013 to offer a 2.2 km intermediate configuration, a 2.9 km advanced course, a skid pad, a pit lane, and a multi-storey event centre with classrooms.

The Bridgestone Racing Academy operated at Mosport from 2000 to 2019, conducting corporate programs, racing schools, and a Mechanics Training Program. The academy was originally established at Shannonville Motorsport Park, when owners Charlie and Brett Goodman acquired the cars and equipment of the former Spenard-David Racing School.

Mosport Speedway was a 0.80 km oval located on the northwest corner of the property. The track featured 240 m straightaways, 6-degree banked corners, and grandstands seating 8,500. Constructed in 1989 as a dirt track originally called Mosport's Ascot North — named after Ascot Park in Gardena, California — its first event was cancelled after heat races created deep ruts and dislodged stones hidden under the clay. The track was paved that summer and renamed Mosport International Speedway. It hosted a weekly Saturday night stock car program from May to September for 24 years, covering pure stock, sportsman, and late model divisions, along with touring series including the ACT Series, ISMA Supermodifieds, OSCAAR, Lucas Oil Sportsman Cup, CASCAR Super Series, and the NASCAR Canadian Tire Series. The oval closed in July 2013 to accommodate expansion of the Driver Development Centre.

Mosport has experienced several fatalities involving track crew, drivers, and riders. German Formula One driver Manfred Winkelhock was killed in 1985 when his Porsche 962C crashed into a concrete wall. In 2008, during the 29th annual Vintage Automobile Racing Association of Canada Racing Festival, Dino Crescentini of Rochester Hills, Michigan — a ten-year veteran of vintage racing — lost control of a 1977 Wolf Dallara Can-Am car that had previously been driven by Gilles Villeneuve; Crescentini died as a result. In 2018, former Pro Mazda driver Jeff Green, aged 61, left the track at Turn 8 and struck a barrier; he did not survive.

The unofficial fastest lap at the circuit was recorded by Rinaldo Capello in an Audi R10 TDI during qualifying for the 2008 Grand Prix of Mosport, with a time of 1:04.094. The official lap record was set in that same race by Capello's Audi Sport North America teammate Marco Werner, who lapped in 1:05.823.

The Formula One Canadian Grand Prix was held at Mosport in 1961–1967, 1969, 1971–1974, and 1976–1977.

The Can-Am was held at Mosport from 1966–1967, 1969–1974, and 1977–1986.

The American Le Mans Series held its Mobil 1 SportsCar Grand Prix at Mosport from 1999 to 2013. In September 2013 it was announced that Canadian Tire Motorsport Park would host an annual round of the IMSA WeatherTech SportsCar Championship beginning in 2014, replacing the American Le Mans Series as the feature race during the track's annual SportsCar Grand Prix.

The NASCAR Canada Series has visited the facility at least twice annually every year since its inaugural 2007 season. The race is currently known as the Clarington 200, held during the Victoria Day SpeedFest Weekend; a second round is held during the Chevrolet Silverado 250 weekend.

The circuit has hosted the World Sportscar Championship (1976–1977, 1980–1981, 1984–1985), SCCA Formula 5000 Championship, Atlantic Championship, USAC IndyCar (including the Molson Diamond Indy in 1967–1968 and 1977–1978), FIM Superbike World Championship (1989–1991), Canadian Superbike Championship, Trans-Am Series, and various other sports car, open-wheel, and motorcycle series across its history.

Mosport has also hosted several major music festivals, including the Strawberry Fields Festival (August 1970), Canada Jam (August 1978), the Heatwave Festival (August 1980), Edenfest (July 1996), and the Boots and Hearts Music Festival (2012–2014).

This article is based solely on the supplied corpus. No external sources were consulted; claims that could not be substantiated against the corpus were omitted under the drop-the-claim rule.