| Race Title: | GT Challenge at VIR |
| Series Long: | IMSA WeatherTech SportsCar Championship |
| Series Short: | USCC |
| Venue: | Virginia International Raceway |
| First Race: | 1957 |
| First Series Race: | 2014 |
| Duration: | 2 hours 40 minutes |
| Most Wins Driver: | Walt Hansgen (4) |
| Most Wins Team: | Briggs Cunningham (5) |
| Most Wins Manufacturer: | Riley (7) |
The GT Challenge at VIR is a sports car race held at the Virginia International Raceway in Alton, Virginia, since 1957. After being a part of the SCCA National Sports Car Championship and the IMSA GT Championship the race, along with the track, went on hiatus from the early 1970s until 2002. It returned as a round of the Rolex Sports Car Series, and became an American Le Mans Series race in 2012. In 2014 the race joined the schedule of the United SportsCar Championship after the merger of the American Le Mans Series and the Rolex Sports Car Series.
The race length has varied from 150 to 500 km. The former title VIR 240 refers to the duration of 240 minutes (4 hours). In 2013, the race was renamed the Oak Tree Grand Prix.[1]
Beginning in 2016, the Oak Tree Grand Prix became the name of the Continental Tire SportsCar Challenge support race run on the same weekend as the United SportsCar Championship Michelin GT Challenge at VIR.
| Season | Date | Overall Winner(s) | Entrant | Car | Distance/Duration | Race Title | Report | |
|---|---|---|---|---|---|---|---|---|
| SCCA National Sports Car Championship | ||||||||
| 1957 | August 4 |  John Engar | 100km (100miles) | Inaugural Grand Prix Sports Car Races | report | |||
| October 27 | 2 hours, 30 minutes | President's Cup Race | report | |||||
| 1958 | May 4 | 1 hour | National Championship Spring Sprint Sports Car Road Races | report | ||||
| October 5 | 150km (90miles) | Autumn Festival Sports Car Races | report | |||||
| 1959 | May 3 | 200km (100miles) | VIR-Shrine National Championship Sports Car Races | report | ||||
| 1960 | May 1 | 200km (100miles) | VIR-Shrine National Championship Sports Car Races | report | ||||
| 1961 | April 30 | 3 hours | President's Cup | report | ||||
| 1962 | April 29 | Cooper Monaco | 2 hours, 30 minutes | President's Cup | report | |||
| 1963 | April 27 | Meister Brauser Racing | 1 hour, 30 minutes | VIR National Cup | report | |||
| 1964 | April 19 | 58miles | National Championship Sports Car Races | report | ||||
| 1965 – 1970 | Not held | |||||||
| IMSA GT Championship | ||||||||
| 1971 | April 18 | Porsche 914/6 | 300miles | Danville 300 | report | |||
| 1972 | April 16 | 250miles | Danville 250 | report | ||||
| 1973 – 2001 | Not held | |||||||
| Rolex Sports Car Series | ||||||||
| 2002 | September 1 | 500miles | VIR 500 | report | ||||
| 2003 | October 5 | 400km (200miles) | VIR 400 | report | ||||
| 2004 | October 3 | 400km (200miles) | VIR 400 | report | ||||
| 2005 | October 9 | 2 hours, 45 minutes | VIR 400 | report | ||||
| 2006 | April 23 | 400km (200miles) | VIR 400 | report | ||||
| 2007 | April 29 | 400km (200miles) | VIR 400 | report | ||||
| 2008 | April 27 | 250miles | Bosch Engineering 250 at VIR | report | ||||
| 2009 | April 25 | 2 hours, 45 minutes | Bosch Engineering 250 at VIR | report | ||||
| 2010 | April 24 | 2 hours, 45 minutes | Bosch Engineering 250 at VIR | report | ||||
| 2011 | May 14 | João Barbosa Terry Borcheller J. C. France | 2 hours, 45 minutes | Bosch Engineering 250 at VIR | report | |||
| American Le Mans Series | ||||||||
| 2012 | September 15 | Muscle Milk Pickett Racing | HPD ARX-03a | 4 hours | American Le Mans Series VIR 240 | report[2] | ||
| 2013 | October 5 | Muscle Milk Pickett Racing | HPD ARX-03a | 2 hours, 45 minutes | Oak Tree Grand Prix at VIR | report[3] | ||
| United SportsCar Championship | ||||||||
| 2014 | August 24 |  Luis Díaz Sean Rayhall | 8 Star Motorsports | Oreca FLM09 Chevrolet | 1 hour, 30 minutes (2 x 45-minute segments) | Oak Tree Grand Prix at VIR | report[4] [5] | |
 Giancarlo FisichellaPierre Kaffer | Risi Competizione | Ferrari F458 Italia | 2 hours, 45 minutes | |||||
| 2015 | August 23 |  Patrick Pilet Nick Tandy | Porsche North America | Porsche 911 RSR | 2 hours, 40 minutes | Oak Tree Grand Prix at VIR | report[6] | |
| 2016 | August 28 |  Antonio GarcíaJan Magnussen | Corvette Racing | Chevrolet Corvette C7.R | 2 hour, 40 minutes | Michelin GT Challenge at VIR | report | |
| 2017 | August 27 | Antonio García Jan Magnussen | Corvette Racing | Chevrolet Corvette C7.R | 2 hour, 40 minutes | Michelin GT Challenge at VIR | report | |
| 2018 | August 19 | Connor De Phillippi Alexander Sims | BMW Team RLL | BMW M8 GTE | 2 hour, 40 minutes | Michelin GT Challenge at VIR | report | |
| 2019 | August 25 | Patrick Pilet Nick Tandy | Porsche GT Team | Porsche 911 RSR | 2 hour, 40 minutes | Michelin GT Challenge at VIR | report | |
| 2020 | August 22 | Antonio García Jordan Taylor | Corvette Racing | Chevrolet Corvette C8.R | 2 hour, 40 minutes | Michelin GT Challenge at VIR | report | |
| 2021 | October 9 | Tommy Milner Nick Tandy | Corvette Racing | Chevrolet Corvette C8.R | 2 hour, 40 minutes | Michelin GT Challenge at VIR | report | |
| 2022 | August 28 |  Matt Campbell Mathieu Jaminet |  Pfaff Motorsports | Porsche 911 GT3 R | 2 hour, 40 minutes | Michelin GT Challenge at VIR | report | |
| 2023 | August 27 | Antonio García Jordan Taylor | Corvette Racing | Chevrolet Corvette C8.R GTD | 2 hour, 40 minutes | Michelin GT Challenge at VIR | report | |
| url=http://results.imsa.com/Results/18_2018/18_VIRginia%20International%20Raceway/01_IMSA%20WeatherTech%20SportsCar%20Championship/201808191305_Race/03_Results_Race_Official.PDF | title=Official Race Results | date=2018-08-21 | website=International Motor Sports Association | archive-url=https://web.archive.org/web/20181209052708/http://results.imsa.com/Results/18_2018/18_VIRginia%20International%20Raceway/01_IMSA%20WeatherTech%20SportsCar%20Championship/201808191305_Race/03_Results_Race_Official.PDF%7Carchive-date%3D2018-12-09%7Curl-status%3D%7Caccess-date%3D2018-12-09%7D%7D | ||||