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| 1/6/2021 | Cocopah Speedway - Somerton, AZ Cocopah Speedway 2021 Winter Nationals presented by Yuma Insurance IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Marlyn Seidler (IMCA Modified) | - | - | - | - |
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| 4/30/2021 | Dacotah Speedway - Mandan, ND Dacotah Speedway Season Opener Hobby Stocks, Semi-Pro Legends, Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 22nd (DNF) |
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| 5/7/2021 | Dacotah Speedway - Mandan, ND Mandan Dirt Series + 2020 Awards Night Hobby Stocks, Semi-Pro Legends, Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 4th |
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| 5/14/2021 | Dacotah Speedway - Mandan, ND Mandan Dirt Series Hobby Stocks, Semi-Pro Legends, Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 1st |
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| 5/15/2021 | Southwest Speedway - Dickinson, ND Regular Night Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 14th (DNF) |
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| 5/21/2021 | Dacotah Speedway - Mandan, ND Mandan Dirt Series Hobby Stocks, Semi-Pro Legends, Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 2nd | - | - | 1st |
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| 5/28/2021 | Dacotah Speedway - Mandan, ND Military Appreciation Night + Mandan Dirt Series Hobby Stocks, Semi-Pro Legends, Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 4th | - | - | 4th |
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| 6/4/2021 | Dacotah Speedway - Mandan, ND Ironman 100 - Night 1 Semi-Pro Legends, IMCA Modified, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 4th | - | 2nd | - |
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| 6/5/2021 | Dacotah Speedway - Mandan, ND Ironman 100 - Night 2 - $5000 to Win Mods Hobby Stocks, IMCA Modified, IMCA Northern SportMod, IMCA Sport Compact | Results | | Marlyn Seidler (IMCA Modified) | - | - | - | 3rd |
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| 6/11/2021 | Dacotah Speedway - Mandan, ND Mandan Dirt Series Hobby Stocks, Semi-Pro Legends, Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 4th | - | - | 4th |
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| 6/12/2021 | Southwest Speedway - Dickinson, ND Southwest Speedway Tougher Than Dirt Tour Night IMCA Northern SportMod: Tougher Than Dirt Tour Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Stock Car, IMCA Hobby Stock, Junior Slingshots | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 1st |
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| 6/18/2021 | Dacotah Speedway - Mandan, ND Mandan Dirt Series Hobby Stocks, Semi-Pro Legends, Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 7th | - | - | 9th |
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| 6/26/2021 | Southwest Speedway - Dickinson, ND Richard Jordan Memorial Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 2nd |
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| 7/14/2021 | Southwest Speedway - Dickinson, ND Dakota Classic Modified Tour IMCA Modified: Dakota Classic Modified Tour IMCA Stock Car | Results | | Marlyn Seidler (IMCA Modified) | 4th | - | 4th | 22nd (DNF) |
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| 7/15/2021 | Dacotah Speedway - Mandan, ND Dakota Classic Modified Tour - Championship Night IMCA Modified: Dakota Classic Modified Tour Semi-Pro Legends, IMCA Stock Car | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 2nd |
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| 7/17/2021 | Jamestown Speedway - Jamestown, ND Race of Champion Qualifier, INEX Legends Special, & Kids Night Semi-Pro Legends, Pure Stock, IMCA Modified, WISSOTA Midwest Mods, WISSOTA Street Stock, Junior Slingshots | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 2nd |
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| 7/23/2021 | Dacotah Speedway - Mandan, ND Mandan Dirt Series + Race of Champions Qualifier Hobby Stocks, Semi-Pro Legends, Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 3rd |
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| 7/24/2021 | Southwest Speedway - Dickinson, ND Regular Night Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 1st |
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| 7/30/2021 | Dacotah Speedway - Mandan, ND ND Governors Cup Auto Races - Night 1 410 Sprints - Winged: Northern Outlaw Sprint Association Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 2nd | - | - | 5th |
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| 7/31/2021 | Dacotah Speedway - Mandan, ND ND Governors Cup Auto Races - Night 2 410 Sprints - Winged: Northern Outlaw Sprint Association Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 5th | - | - | 8th |
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| 8/7/2021 | Southwest Speedway - Dickinson, ND Regular Night Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 2nd |
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| 8/13/2021 | Dacotah Speedway - Mandan, ND Mandan Dirt Series Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 3rd | - | - | 1st |
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| 8/14/2021 | Sheridan Speedway - Sheridan, WY I 90 - Night 2 Sponsored by McDonald's Dirt Mini Trucks, IMCA Modified, WISSOTA Midwest Mods, WISSOTA Mod Four, WISSOTA Late Model, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 2nd | - | - | 2nd |
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| 8/15/2021 | Sheridan Speedway - Sheridan, WY I 90 - Night 3 Sponsored by Sheridan Homes Quarter Midgets, Dirt Mini Trucks, Junior Honda, IMCA Modified, WISSOTA Midwest Mods, WISSOTA Mod Four, WISSOTA Late Model, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 1st |
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| 8/21/2021 | Southwest Speedway - Dickinson, ND Season Championship Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 1st |
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| 8/27/2021 | Dacotah Speedway - Mandan, ND Championship Night + Drive to Survive Night Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 3rd |
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| 9/3/2021 | Gillette Thunder Speedway - Gillette, WY 21ST ANNUAL EAST-WEST CLASH IMCA Modified, IMCA Hobby Stock, WISSOTA Midwest Mods, WISSOTA Mod Four, WISSOTA Late Model, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 2nd | - | - | 15th (DNF) |
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| 9/4/2021 | Gillette Thunder Speedway - Gillette, WY 21ST ANNUAL EAST-WEST CLASH Sport Compact, IMCA Modified, IMCA Hobby Stock, WISSOTA Midwest Mods, WISSOTA Mod Four, WISSOTA Late Model, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 2nd |
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| 9/5/2021 | Gillette Thunder Speedway - Gillette, WY 21ST ANNUAL EAST-WEST CLASH CHAMPIONSHIP Sport Compact, IMCA Modified, IMCA Hobby Stock, WISSOTA Midwest Mods, WISSOTA Mod Four, WISSOTA Late Model, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 3rd |
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| 9/10/2021 | Southwest Speedway - Dickinson, ND Harvest Shootout Night 1 Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 1st |
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| 9/11/2021 | Southwest Speedway - Dickinson, ND Harvest Shootout Night 2 Hobby Stocks, Semi-Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, Junior Slingshots | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 4th |
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| 9/24/2021 | Sheridan Speedway - Sheridan, WY Fall Classic - Sponsored by Big Horn Radio Network IMCA Modified, WISSOTA Midwest Mods, WISSOTA Mod Four, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 1st |
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| 9/25/2021 | Sheridan Speedway - Sheridan, WY Fall Classic - Sponsored by Sheridan Motorsports Association IMCA Modified, WISSOTA Midwest Mods, WISSOTA Mod Four, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | - | - | 2nd |
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| 10/1/2021 | Dacotah Speedway - Mandan, ND Oktoberfest - Night 1 Hobby Stocks, Non-Winged Sprints, Semi-Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | 1st | 2nd | - | - |
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| 10/2/2021 | Dacotah Speedway - Mandan, ND Oktoberfest - Night 2 Hobby Stocks, Non-Winged Sprints, Semi-Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (IMCA Modified) | - | - | - | 2nd |
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