NASCAR Canadian Tire Series:
NASCAR announced the purchase of Canadian racing series CASCAR in September of 2006. The CASCAR Western Series will become NASCAR's fourth-tier series starting in the Fall of 2007.

NASCAR Corona Series:
In December of 2006, NASCAR also announced the creation of a new series in Mexico, the NASCAR Corona Series, replacing the existing Desafio Corona Series, to begin in 2007.

Regional racing series:

In addition to the five main series, NASCAR operates several other racing circuits.

Many local race tracks across the United States and Canada run under the Whelen All-American Series banner, where local drivers are compared against each other in a formula where the best local track champion of the nation wins the Whelen All-American Weekly Series National Championship. The Whelen All-American series is split into four divisions. Each division champion receives a point-fund money payout and even more goes to the National champion (driver with most points out of the four division winners). The Whelen All-American Series is the base for stock car racing, developing NASCAR names such as Clint Bowyer, Jimmy Spencer, Tony Stewart, the Bodine brothers and many others along the way.

NASCAR also sanctions three regional racing divisions: The Whelen Modified Tour, which races open-wheel "modified" cars in Northern and Southern divisions; the Grand National Division, which races in the Busch East Series (formerly Busch North); and the NASCAR West Series. Grand National cars are similar to Busch Series cars, although they are less powerful. The AutoZone Elite Division, which races late-model cars which are lighter and less powerful than NEXTEL Cup cars, was originally split into four divisions: Northwest, Southwest, Southeast, and Midwest. At the end of 2005, NASCAR announced that the AutoZone Elite Division would be discontinued after the 2006 season due to having trouble securing NASCAR-sanctioned tracks to successfully host AutoZone Elite Division events, plus escalating costs of competing and downsizing of the Division in recent years.

In 2003, NASCAR standardized rules for its AutoZone Elite and Grand National divisions regional touring series as to permit cars in one series to race against cars in another series in the same division. The top 15 (Grand National) or 10 (AutoZone Elite) in each series will race in a one-race playoff, called the NASCAR Toyota All-Star Showdown, to determine the annual AutoZone Elite and Grand National champions. This event has been hosted at Irwindale Speedway in California since its inception.

Many drivers move up through the series before reaching the NEXTEL Cup series. In 2002, over 9,000 drivers had licenses from NASCAR to race at all levels.

The winners of the Dodge Weekly Series National Championship, the four AutoZone Elite Divisions, the two Whelen Modified and Grand National Divisions, and the three national series are invited to New York City in December to participate in Champions Week ceremonies which conclude with the annual awards banquet at the Waldorf-Astoria Hotel.

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