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| 2/13/2021 | Kings Speedway - Hanford, CA Open Practice 360 Sprints - Winged, 305 Sprints - Winged, Stock Cars, A Modifieds, B Modifieds, Lightning Sprints | Results | | Grant Duinkerken (360 Sprints - Winged) | - | - | - | - |
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| 2/20/2021 | Kings Speedway - Hanford, CA Opening Night 360 Sprints - Winged, 305 Sprints - Winged, Asphalt Mini Stocks, Stock Cars, Lightning Sprints | Results | | Grant Duinkerken (360 Sprints - Winged) | 6th | - | 2nd | 17th |
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| 3/12/2021 | Kings Speedway - Hanford, CA Night # 1 360 Sprints - Winged, Stock Cars | Results | | Grant Duinkerken (360 Sprints - Winged) | 4th | - | - | 15th |
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| 3/13/2021 | Kings Speedway - Hanford, CA 360 Sprints - Winged: ASCS National Factory Stocks, Asphalt Mini Stocks, Lightning Sprints | Results | | Grant Duinkerken (360 Sprints - Winged) | 1st | 5th | - | 17th |
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| 3/26/2021 | Kings Speedway - Hanford, CA TULARE - KINGS OF THUNDER 360 360 Sprints - Winged: Kings of Thunder | Results | | Grant Duinkerken (360 Sprints - Winged) | - | - | - | 20th |
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| 3/26/2021 | Plaza Park Raceway powered by Keller Auto Center - Visalia, CA Opening Night @ Tunderbowl 360 Sprints - Winged, Winged Outlaw, Restricted 'A' Class, Winged A-Class, Stock Non-Wing, 410 Sprints - Non-Winged, Junior Sprints, IMCA RaceSaver Sprint Car | Results | | Grant Duinkerken (360 Sprints - Winged) | 4th | - | - | 20th |
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| 3/27/2021 | Kings Speedway - Hanford, CA TULARE - KINGS OF THUNDER 360 360 Sprints - Winged: Kings of Thunder | Results | | Grant Duinkerken (360 Sprints - Winged) | - | - | 7th | - |
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| 3/27/2021 | Plaza Park Raceway powered by Keller Auto Center - Visalia, CA Thunderbowl Night #2 360 Sprints - Winged, 410 Sprints - Non-Winged, IMCA Stock Car, IMCA RaceSaver Sprint Car | Results | | Grant Duinkerken (360 Sprints - Winged) | 7th | - | 7th | - |
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| 5/14/2021 | Kings Speedway - Hanford, CA Peter Murphy Classic 360 Sprints - Winged: Sprint Car Challenge Tour with Kings of Thunder Winged Sprints | Results | | Grant Duinkerken (360 Sprints - Winged) | 2nd | - | - | 14th |
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| 5/15/2021 | Kings Speedway - Hanford, CA TULARE - KINGS OF THUNDER 360 360 Sprints - Winged: Kings of Thunder | Results | | Grant Duinkerken (360 Sprints - Winged) | - | - | 11th | - |
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| 5/15/2021 | Plaza Park Raceway powered by Keller Auto Center - Visalia, CA Peter Murphy Classic Night #2 360 Sprints - Winged, 410 Sprints - Winged, IMCA RaceSaver Sprint Car | Results | | Grant Duinkerken (360 Sprints - Winged) | 6th | - | 11th | - |
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| 7/23/2021 | Kings Speedway - Hanford, CA FARIA MEMORIAL 360 Sprints - Winged: Kings of Thunder | Results | | Grant Duinkerken (360 Sprints - Winged) | - | - | - | 9th |
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| 8/6/2021 | Ocean Speedway - Watsonville, CA Taco Bravo Round # 17 360 Sprints - Winged, Factory Stocks, Hobby Stocks, A Modifieds, B Modifieds, Dwarf | Results | | Grant Duinkerken (360 Sprints - Winged) | 6th | - | 2nd | 9th |
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| 8/13/2021 | Ocean Speedway - Watsonville, CA Taco Bravo Round # 18 360 Sprints - Winged, Hobby Stocks, A Modifieds, B Modifieds, Street Stocks | Results | | Grant Duinkerken (360 Sprints - Winged) | 1st | 7th | - | 12th |
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| 9/25/2021 | Kings Speedway - Hanford, CA NARC KING OF THE WEST / JIM TURNER MEMORIAL 410 Sprints - Winged, Asphalt Mini Stocks, 410 Sprints - Non-Winged | Results | | Grant Duinkerken (410 Sprints - Winged) | 3rd | - | - | - |
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| 10/8/2021 | Kings Speedway - Hanford, CA Cotton Classic 360 Sprints - Winged: Sprint Car Challenge Tour with Kings of Thunder Winged Sprints, Sprint Cars | Results | | Grant Duinkerken (360 Sprints - Winged) | 7th | - | 4th | 22nd |
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| 10/9/2021 | Kings Speedway - Hanford, CA Morrie Williams Memorial/ Kenny Takeuchi Tribute 360 Sprints - Winged: Kings of Thunder Midgets: BCRA - Bay Cities Racing Association 410 Sprints - Winged | Results | | Grant Duinkerken (360 Sprints - Winged) | DNS | - | DNS | - |
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| 10/21/2021 | Thunderbowl Raceway - Tulare, CA Trophy Cup Night #1 360 Sprints - Winged | Results | | Grant Duinkerken (360 Sprints - Winged) | 7th | - | 11th | - |
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| 10/22/2021 | Thunderbowl Raceway - Tulare, CA Trophy Cup Night #2 360 Sprints - Winged | Results | | Grant Duinkerken (360 Sprints - Winged) | 6th | - | - | - |
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| 10/23/2021 | Thunderbowl Raceway - Tulare, CA Trophy Cup Night #3 360 Sprints - Winged | Results | | Grant Duinkerken (360 Sprints - Winged) | 6th | - | - | - |
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| 11/12/2021 | Kings Speedway - Hanford, CA TULARE - KINGS OF THUNDER 360 (NOV 12) 360 Sprints - Winged: Kings of Thunder | Results | | Grant Duinkerken (360 Sprints - Winged) | - | - | - | 12th |
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| 11/12/2021 | Thunderbowl Raceway - Tulare, CA Kings of Thunder 360 Sprints - Winged, 305 Sprints - Winged, Dirt Mini Stocks | Results | | Grant Duinkerken (360 Sprints - Winged) | 6th | - | - | 12th |
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| 11/13/2021 | Kings Speedway - Hanford, CA Fall Classic 360 Sprints - Winged: Kings of Thunder 305 Sprints - Winged, Asphalt Mini Stocks | Results | | Grant Duinkerken (360 Sprints - Winged) | 8th (DNF) | - | - | - |
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