# IndyCar Grand Prix of Sonoma

The IndyCar Grand Prix of Sonoma was an IndyCar Series race held at Sonoma Raceway in Sonoma, California. The USAC Championship Car circuit raced at the circuit in 1970. In 2005, American open wheel racing returned to the circuit with an IndyCar Series event. The 2006 event saw rookie Marco Andretti win his first career race. It marked the record youngest winner (19 years, 5 months, 14 days) of a major open-wheel racing event at the time.
The IndyCar Series race utilizes a modified 2.2-mile (3.5 km) version of the road course, the same used by AMA Superbike. The circuit includes the carousel, making it longer than the NASCAR layout, but shorter than the full 2.52-mile (4.06 km) course. This course uses turn 7a of the NASCAR course, but skips the hairpin prior to the front straight. The dragstrip is used instead of the keyhole, adding a high speed section immediately following the exit of the carousel.
For 2012, the course was altered. The back hairpin used the inner loop instead of the outer loop used by NASCAR. Turn nine was widened by ten feet while turn eleven at the hairpin was extended by 200 feet.
From 2015 to 2018, the race had served as the IndyCar season finale.
It was announced on July 13, 2018, that the Monterey Grand Prix at WeatherTech Raceway Laguna Seca would replace Sonoma for the 2019 IndyCar Series season.

## Past winners

| Season | Date | Driver | Team | Chassis | Engine | Race Distance | Race Distance | Race Time | Average Speed (mph) | Report |
| Season | Date | Driver | Team | Chassis | Engine | Laps | Miles (km) | Race Time | Average Speed (mph) | Report |
| USAC Championship Car history |||||||||||
| 1970 | April 4 | Dan Gurney | All American Racers | Eagle | Ford | 60 | 151.2 (243.332) | 1:44:26 | 87.009 | Report |
| 1971 – 2004 | Not held | Not held | Not held | Not held | Not held | Not held | Not held | Not held | Not held | Not held |
| IRL IndyCar Series history |||||||||||
| 2005 | August 28 | Tony Kanaan | Andretti Green Racing | Dallara | Honda | 80 | 159.2 (256.207) | 2:01:16 | 91.04 | Report |
| 2006 | August 27 | Marco Andretti | Andretti Green Racing | Dallara | Honda | 80 | 159.2 (256.207) | 1:58:06 | 93.486 | Report |
| 2007 | August 26 | Scott Dixon | Chip Ganassi Racing | Dallara | Honda | 80 | 159.2 (256.207) | 1:51:59 | 98.593 | Report |
| 2008 | August 24 | Hélio Castroneves | Penske Racing | Dallara | Honda | 80 | 159.2 (256.207) | 1:50:16 | 100.254 | Report |
| 2009 | August 23 | Dario Franchitti | Chip Ganassi Racing | Dallara | Honda | 75 | 166.5 (267.955) | 1:49:23 | 94.745 | Report |
| 2010 | August 22 | Will Power | Team Penske | Dallara | Honda | 75 | 166.5 (267.955) | 1:52:34 | 92.063 | Report |
| 2011 | August 28 | Will Power | Team Penske | Dallara | Honda | 75 | 166.5 (267.955) | 1:47:30 | 96.408 | Report |
| 2012 | August 26 | Ryan Briscoe | Team Penske | Dallara | Chevrolet | 85 | 195.755 (315.037) | 2:07:03 | 95.74 | Report |
| 2013 | August 25 | Will Power | Team Penske | Dallara | Chevrolet | 85 | 195.755 (315.037) | 2:20:47 | 86.401 | Report |
| 2014 | August 24 | Scott Dixon | Chip Ganassi Racing | Dallara | Chevrolet | 85 | 195.755 (315.037) | 2:09:21 | 94.026 | Report |
| 2015 | August 30 | Scott Dixon | Chip Ganassi Racing | Dallara | Chevrolet | 85 | 195.755 (315.037) | 2:09:14 | 94.117 | Report |
| 2016 | September 18 | Simon Pagenaud | Team Penske | Dallara | Chevrolet | 85 | 195.755 (315.037) | 2:00:13 | 101.181 | Report |
| 2017 | September 17 | Simon Pagenaud | Team Penske | Dallara | Chevrolet | 85 | 202.725 (326.254) | 1:55:53 | 104.968 | Report |
| 2018 | September 16 | Ryan Hunter-Reay | Andretti Autosport | Dallara | Honda | 85 | 202.725 (326.254) | 2:02:19 | 99.44 | Report |

### Support Race History

| Indy Lights | Atlantic Championship |
| Season Date Winning Driver 2005 August 28 Marco Andretti 2006 August 26 Wade Cunningham August 27 Alex Lloyd 2007 August 25 Alex Lloyd August 26 Richard Antinucci 2008 August 23 Franck Perera August 24 Pablo Donoso 2009 August 23 J. R. Hildebrand 2010 August 22 J. K. Vernay 2014 August 23 Jack Harvey August 24 Jack Harvey | Season Date Winning Driver 1980 May 25 Tom Gloy 1983 May 8 Michael Andretti 1984 June 3 Dan Marvin September 30 Dan Marvin 1985 June 2 Jeff Wood September 29 Jeff Wood 1986 June 1 Rod Bennett September 28 Roberto Quintanilla 1987 May 31 Dean Hall August 2 Dean Hall 1988 May 29 Dean Hall August 14 Dean Hall 1989 May 7 R.K. Smith September 10 Joe Sposato 1990 May 6 Mark Dismore |