| 2005 Rolex Sports Car Series season | |
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The 2005 Rolex Sports Car Series season was the sixth season of the Rolex Sports Car Series run by the Grand American Road Racing Association. The format was reduced to two classes, Daytona Prototypes (DP) and Grand Touring (GT). 14 races were run from February 5, 2005 to November 5, 2005. Laguna-Seca and Hermanos Rodríguez were added. It set the record for the longest Rolex season.
| Rnd | Race | Distance | Circuit | Date |
|---|---|---|---|---|
| 1 | Rolex 24 at Daytona | 24 Hours | Daytona International Speedway | February 5 February 6 |
| 2 | Grand Prix of Miami | 250 Miles | Homestead-Miami Speedway | March 5 |
| 3 | Ferrari Maserati 400 | 400 km | California Speedway | April 3 |
| 4 | Road & Track 250 | 250 Miles | Mazda Raceway Laguna Seca | May 1 |
| 5 | 6 Hours of Mont-Tremblant | 6 Hours | Circuit Mont-Tremblant | May 21 |
| 6 | Sahlen's Six Hours of the Glen | 6 Hours | Watkins Glen International | June 12 |
| 7 | Brumos Porsche 250 | 250 Miles | Daytona International Speedway | June 30 |
| 8 | Porsche 250 | 400 km | Barber Motorsports Park | July 31 |
| 9 | CompUSA 200 at the Glen | 200 Miles | Watkins Glen International | August 12 |
| 10 | EMCO Gears Classic | 400 km | Mid-Ohio | August 27 |
| 11 | Phoenix 250† | 250 Miles | Phoenix International Raceway | September 9 (GT) September 10 (DP) |
| 12 | Crown Royal 250 at the Glen | 250 Miles | Watkins Glen International | September 24 |
| 13 | VIR 400 | 400 km | Virginia International Raceway | October 9 |
| 14 | Mexico City 250 | 250 Miles | Autódromo Hermanos Rodríguez | November 5 |
† - The DP and GT classes ran separate, individual races at Phoenix.
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