The 2005 IRL IndyCar Series began on Sunday, March 6 and ended on Sunday, October 16. The season, which consisted of 17 races, was the 10th season of the IRL IndyCar Series since it split from CART in 1995. Dan Wheldon was the dominant driver in the series in 2005, winning six races, including the 89th running of the Indianapolis 500, setting the record for most victories in an IRL season. However, the big story of the season was that of Rahal Letterman Racing's Danica Patrick, the fourth woman to compete in the Indy 500 and the first to lead a lap. She would eventually wind up in fourth. Danica's presence was a boost to the IRL's television ratings. The Indy 500's ratings were up 40% from the year before and subsequent races also saw a boost in ratings. Dan Wheldon was also became the first IndyCar driver to won the Indianapolis 500 and IndyCar Series overall driver's title respectively in the same season since Jacques Villeneuve in 1995 PPG IndyCar World Series season and also first ever in the Indy Racing League era. The season was the first ever to introduce road courses and street circuits when the series held races at the Streets of St. Petersburg, Infineon Raceway and Watkins Glen International, where the series was previously known to have held events exclusively on oval tracks. Wheldon also became the series' first road/street course winner when he won in St. Petersburg. The season was also the last for Chevrolet in the series, who confirmed in August that they would not return to the IRL (Chevrolet returned in 2012). At the start of the season, only Panther Racing's Tomas Scheckter and Tomáš Enge raced Chevrolet powered cars (although A. J. Foyt IV also started racing for Chevy beginning with the AMBER Alert Portal Indy 300 at Kentucky). The manufacturer situation within the IRL was the hot issue during the second half of the season and continued into the off-season. Toyota announced that they would leave the series shortly after the 2005 season ended, leaving Honda as the only remaining manufacturer in the IRL. Honda extended their engine supply contract through 2009 despite expressly saying that they did not wish to be the IRL's only supplier. The IRL announced that they extended their chassis supply contract with Panoz and Dallara through 2006.

Rule changes for 2005

Confirmed entries

Race summaries

Toyota Indy 300

On March 6, at Homestead-Miami Speedway, Dan Wheldon led 158 of 200 laps to get the victory. Tomas Scheckter sat on the pole. Top Ten Results

XM Satellite Radio Indy 200

On March 19, at Phoenix International Raceway, Sam Hornish Jr. won his first race of the season. Bryan Herta sat on the pole. This would be the last time IndyCar would compete at Phoenix until the race was revived in 2016. Top Ten Results

Honda Grand Prix of St. Petersburg

On April 3, the Honda Grand Prix on the Streets of St. Petersburg (Florida) marked the first non-oval event for the IndyCar Series. Dan Wheldon won his second race of the year. Bryan Herta sat on the pole. Andretti Green Racing drivers swept the top 4 finishing positions. Top Ten Results

Indy Japan 300

On April 30, at Twin Ring Motegi in Motegi, Tochigi, Japan, Dan Wheldon won his third race of the season. Sam Hornish Jr. sat on the pole. Top Ten Results

89th Indianapolis 500

On May 29, at the Indianapolis Motor Speedway, Dan Wheldon won his first Indy 500 and his fourth race of the season. However, the focus of the race was on Danica Patrick who led 19 laps, the first time a woman has ever led a lap at Indy. Tony Kanaan sat on the pole. Top Ten Results

Bombardier Learjet 500

On June 11, at Texas Motor Speedway, Tomas Scheckter won his first race of the season, sitting on the pole and leading for 119 of 200 laps. This was the last victory for Chevrolet engine in the series before the temporary withdrawal until 2011. Top Ten Results

SunTrust Indy Challenge

On June 25, at Richmond International Raceway, Hélio Castroneves won his first race of the season. Sam Hornish Jr. sat on the pole. Top Ten Results

Argent Mortgage Indy 300

On July 3, at Kansas Speedway, Tony Kanaan won by a fraction of a second over Dan Wheldon and Vítor Meira. Danica Patrick won her first career IndyCar Series pole. Top Ten Results

Firestone Indy 200

On July 16 at Nashville Superspeedway, Dario Franchitti won, leading 74 of 200 laps. Tomas Scheckter sat on the pole. Tomas Enge fractured his back in a lap 27 crash in turn 1 and would miss the next 2 races. Top Ten Results

ABC Supply Company A. J. Foyt 225

On July 24 at The Milwaukee Mile, Sam Hornish Jr. won from the pole, leading 123 of 225 laps. Top Ten Results

Firestone Indy 400

On July 31 at Michigan International Speedway, Bryan Herta won from the pole, leading 159 of 200 laps. Top Ten Results

AMBER Alert Portal Indy 300

On August 14 at Kentucky Speedway, Scott Sharp won for the first time since 2003 at Twin Ring Motegi, holding off Vítor Meira for the last laps to win. Danica Patrick sat on the pole for the second time in the season after rain washed out qualifying and the starting grid was determined by the fastest times in practice. Tomas Enge returned from injury to finish 11th. Top Ten Results

Honda Indy 225

On August 21 at Pikes Peak International Raceway, Penske Racing teammates Hélio Castroneves and Sam Hornish Jr. started 1–2. Dan Wheldon won his fifth race of the season, tying Sam Hornish Jr.'s record for most victories in a season. This was the final IRL race at PPIR as the track was sold to International Speedway Corporation for intent to be shut down as ISC looked for a new Denver-area circuit, but plans failed and the track was sold for testing but cannot be used for competition per ISC regulation. Top Ten Results

Argent Mortgage Indy Grand Prix

On August 28 at the circuit's inaugural race at Infineon Raceway, Tony Kanaan won the race, taking the lead on lap 52 from points leader Dan Wheldon, who was hampered by fuel problems all day and finished out of the race in 18th. Ryan Briscoe sat on the pole, but caused a three-car accident on lap 20 that also eliminated Hélio Castroneves and Danica Patrick from the race. Top Ten Results

Peak Antifreeze Indy 300

On September 11 at Chicagoland Speedway, Dan Wheldon won his sixth race, breaking the all-time record for most wins in an IRL season. Ryan Briscoe originally won the pole but was disqualified for a technical infraction and sent to the back of the grid. The pole winner after this became Danica Patrick for her third (and final) IndyCar pole. Briscoe's weekend got significantly worse as he was involved in a fiery crash with Alex Barron on lap 20. Briscoe was taken by helicopter to a Chicago-area hospital with head and back pain, but was alert. He suffered a concussion, two broken collarbones, a bruised lung and contusions to his arms and legs. The accident resulted in a 16-minute red flag. Top Ten Results

Watkins Glen Indy Grand Prix

On September 25 at Watkins Glen International, Scott Dixon won his first race since his 2003 IndyCar Series Championship season. Hélio Castroneves sat on the pole. This was the first major open-wheel race at Watkins Glen since 1981 and Dixon's first road course victory. As of 2024, this was the final IndyCar Series victory for Toyota engine to date. Top Ten Results

Toyota Indy 400

On October 16 at California Speedway, Dario Franchitti won his second race of the year over Tony Kanaan by 0.111 s. Chevrolet powered cars finished 7th and 8th in their final IRL race while Toyota powered cars had a best finish of 5th in theirs. IndyCar would not return to this track until 2012. Top Ten Results

Season summary

Schedule

Oval/Speedway Road/Street course BOLD indicates Superspeedways.

Race results

Final driver standings

Footnotes