The IHRA was formed in November 1970 by businessman Larry Carrier and operated primarily in the south-eastern United States from its headquarters in Bristol, Tennessee. In its early years the organization closely mirrored the NHRA's professional class structure, running Top Fuel, Funny Car, and Pro Stock. Carrier is credited with initiating drag racing's long-term sponsorship association with the R.J. Reynolds Tobacco Company's Winston brand.
In 1984 the IHRA dropped the premier Top Fuel category, a decision that proved short-lived; the class was reinstated for 1987 following pushback from the racing community.
In 1988 Texan racer and track operator Billy Meyer purchased the IHRA, briefly relocating headquarters to Waco, Texas. Meyer made sweeping changes, including a complete restructuring of the sportsman classes and a reorientation of the series around his Texas Motorplex facility, which had previously served as an NHRA flagship track. That same year at the Motorplex, Eddie Hill recorded Top Fuel's first four-second elapsed time run. Meyer also introduced Factory Modified, a junior Pro Stock class for small-block and V6 engines that ran through 1990.
Financial difficulties ended Meyer's ownership after a single year, and the IHRA returned to Bristol, Tennessee under new owners Ted Jones and Jim Ruth. In 1990 the IHRA introduced Pro Modified, an unlimited doorslammer category that grew into one of drag racing's most popular classes and became a feature at events worldwide. The Funny Car class was dropped after 1990 and had a turbulent return—briefly reinstated for 1992 before being dropped again, not returning until 2006.
Bill Bader acquired the IHRA in 1998 and expanded its footprint into the Great Lakes region from his base in Norwalk, Ohio, where the IHRA's World Nationals event had become a marquee fixture. Bader subsequently sold to Clear Channel Communications while remaining president until his retirement in October 2004.
Clear Channel's split into Clear Channel Radio and Live Nation in 2005 placed the IHRA under Live Nation. Feld Entertainment acquired Live Nation's motorsports division in 2008 and operated the IHRA for four years. In 2010 the IHRA adopted the "Chicago style" format for professional classes, which drew criticism from competitors. Palm Beach International Raceway ownership group purchased the IHRA in 2013, rebranding it IHRA Motorsports and integrating it into IRG Sports + Entertainment, which eliminated the Chicago format for 2014.
After 2014 the IHRA ceased running professional national events and became primarily a sportsman series with track sanctioning, leaving the NHRA as the only major national drag racing series for professional competition.
On December 14, 2024, businessman Darryl Cuttell announced the acquisition of the IHRA. Within months the organization announced the purchase of seven race tracks including National Trail Raceway, Milan Dragway, and Kil-Kare Raceway, along with a 2025 schedule featuring a return to professional national events.
In November 2025 the IHRA completed the acquisition of the World Drag Racing Association (WDRA), expanding its affiliated track network to 117 member venues across the United States, Canada, Aruba, Australia, and New Zealand. Entering 2026, the IHRA began extending into additional motorsport disciplines, acquiring Powerboat P1 USA/P1 Offshore in October 2025 and launching the IHRA Stock Car Series shortly thereafter.
Despite its name, the IHRA operated for many years solely within the United States. Its first major Canadian event was a one-off in 1992 at Toronto Motorsports Park in Cayuga, Ontario. Regular Canadian events followed later in the decade, and the IHRA eventually grew to become a prominent motorsport sanctioning body in Canada, hosting national drag racing events in Ontario (Grand Bend) and Alberta (Edmonton).
Beyond North America the IHRA maintains affiliated tracks in Hawaii, Alaska, and Aruba. In 2015 the organization added three Australian tracks through association with the 400 Thunder series, though Perth Motorplex subsequently returned to Australian National Drag Racing Association (ANDRA) sanctioning following a government tender process.
The IHRA historically fielded professional categories including Top Fuel, Funny Car, Pro Stock, and its signature Pro Modified class. Sportsman categories cover a broad spectrum of bracket, index, and class racing at the grassroots level. Pro Modified, introduced in 1990, is widely regarded as the IHRA's most influential contribution to drag racing, inspiring Pro Mod programs at sanctioning bodies worldwide including the NHRA.
The IHRA's six-decade history reflects the volatile economics of professional drag racing in North America. Its most durable legacy is Pro Modified drag racing, which it introduced and popularized before the class spread globally. After a decade as a purely regional sportsman series, the IHRA's mid-2020s revival under new ownership—complete with track acquisitions, renewed national events, and expansion into powerboat and stock car racing—signals renewed ambitions to compete as a genuine alternative sanctioning body in North American motorsport.