The Clean Harbors 150 was a NASCAR Camping World Truck Series racing event at Knoxville Raceway in Iowa.

The inaugural running of the race was on July 9, 2021, the first NASCAR national touring event to be held at the historic facility.

[3] On November 19, 2020, NASCAR revealed the 2021 Camping World Truck Series schedule, which featured two dirt-track events, one being the Pinty's Dirt Truck Race at Bristol Motor Speedway in March, and the other at Knoxville Raceway in Iowa,[4] a historic one-half-mile dirt oval track that began competition in 1901 and is best known for hosting the Knoxville Nationals sprint car championships, which led to the moniker "Sprint Car Capital of the World".

[5] The event, scheduled to take place on July 9, has the NASCAR Camping World Truck Series anchoring the weekend's races, accompanied by the Brandt Professional Agriculture Corn Belt Clash for the United States Auto Club's AMSOIL National Sprint Car Series and the POWRi W.A.R.

[8][9] On June 25, 2021, the association of Iowa Chevrolet dealerships (Premier Chevy Dealers) was announced as the presenting sponsor of the 150-lap race.