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| 5/1/2021 | Deer Creek Speedway - Spring Valley, MN Points Race USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 5th | - | - | 9th |
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| 5/7/2021 | Chateau Speedway - Lansing, MN Season Opener Regular Friday Night Racing USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Super Stock, WISSOTA Hornet | Results | | Darwin Karau (USRA Modifieds) | 2nd | - | - | 7th |
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| 5/8/2021 | Deer Creek Speedway - Spring Valley, MN Points Race USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 3rd | - | - | 10th |
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| 5/14/2021 | Chateau Speedway - Lansing, MN Regular Friday Night Racing USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Super Stock, WISSOTA Hornet | Results | | Darwin Karau (USRA Modifieds) | 1st | - | - | 10th (DNF) |
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| 5/15/2021 | Deer Creek Speedway - Spring Valley, MN Points Race A Modifieds, USRA B-Mods, USRA Modifieds, USRA Late Models, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 6th | - | - | 10th |
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| 5/22/2021 | Deer Creek Speedway - Spring Valley, MN Points Race USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 7th (DNF) | - | - | 12th |
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| 5/29/2021 | Deer Creek Speedway - Spring Valley, MN 18th Annual USMTS Southern MN Spring Challenge A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods, USRA Stock Cars, WISSOTA Midwest Mods | Results | | Darwin Karau (A Modifieds) | 6th | - | 13th | - |
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| 6/4/2021 | Chateau Speedway - Lansing, MN Regular Friday Night Racing USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Super Stock, WISSOTA Hornet | Results | | Darwin Karau (USRA Modifieds) | 1st | - | - | 8th |
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| 6/5/2021 | Deer Creek Speedway - Spring Valley, MN 1st Annual Event Dirt Super Late Models: Lucas Oil MLRA USRA Modifieds, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 5th | - | - | 9th |
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| 6/11/2021 | Chateau Speedway - Lansing, MN Regular Friday Night Racing USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Super Stock, WISSOTA Hornet | Results | | Darwin Karau (USRA Modifieds) | 9th | - | - | 5th |
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| 6/12/2021 | Deer Creek Speedway - Spring Valley, MN Points Race USRA B-Mods, USRA Modifieds, USRA Late Models, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 4th | - | - | 11th |
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| 6/13/2021 | Mason City Motor Speedway - Mason City, IA Season Opener USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Darwin Karau (USRA Modifieds) | 8th | - | - | 9th |
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| 6/18/2021 | Chateau Speedway - Lansing, MN UMSS Non Wing Traditional Sprint Special #1 360 Sprints - Non-Winged, USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Hornet | Results | | Darwin Karau (USRA Modifieds) | 1st | - | - | 9th |
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| 6/19/2021 | Deer Creek Speedway - Spring Valley, MN Pink Out Night - Points Race USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 3rd | - | - | 19th (DNF) |
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| 7/2/2021 | Mississippi Thunder Speedway - Fountain City, WI Karl Fenske Memorial Dirt Late Models, Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Results | | Darwin Karau (USRA Modifieds) | 6th | - | - | 15th |
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| 7/3/2021 | Deer Creek Speedway - Spring Valley, MN Fireworks - Points Race USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 5th | - | - | 22nd (DNF) |
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| 7/10/2021 | Deer Creek Speedway - Spring Valley, MN Points Race USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 2nd | - | - | 15th |
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| 7/17/2021 | Deer Creek Speedway - Spring Valley, MN Tasseldega Nights - Points Race - FREE Grandstands USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 6th | - | - | 17th (DNF) |
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| 7/23/2021 | Chateau Speedway - Lansing, MN Hall of Fame Induction Night USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Hornet | Results | | Darwin Karau (USRA Modifieds) | 5th | - | - | 14th (DNF) |
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| 7/24/2021 | Deer Creek Speedway - Spring Valley, MN Points Race USRA B-Mods, USRA Modifieds, USRA Late Models, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 5th | - | - | 17th |
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| 7/31/2021 | Deer Creek Speedway - Spring Valley, MN Points Race USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Rain Out |
| 8/6/2021 | Chateau Speedway - Lansing, MN Regular Friday Night Racing. Race of Champions. Sprints 360 Sprints - Non-Winged, USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Hornet | Results | | Darwin Karau (USRA Modifieds) | 7th | - | - | 9th |
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| 8/13/2021 | Chateau Speedway - Lansing, MN Fireworks and Regular racing USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Hornet | Results | | Darwin Karau (USRA Modifieds) | 1st | - | - | 8th |
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| 8/14/2021 | Deer Creek Speedway - Spring Valley, MN Veterans Night- Points Race USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 5th | - | - | 14th |
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| 8/15/2021 | Mason City Motor Speedway - Mason City, IA B-Mod Challenge Presented by Kabrick Distributing 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars | Results | | Darwin Karau (USRA Modifieds) | 6th | - | - | 12th (DNF) |
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| 8/21/2021 | Deer Creek Speedway - Spring Valley, MN Points Race USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Darwin Karau (USRA Modifieds) | 5th | - | - | 20th (DNF) |
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| 8/22/2021 | Mason City Motor Speedway - Mason City, IA Driver Appreciation Night 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Darwin Karau (USRA Modifieds) | 5th | - | - | 10th |
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| 8/28/2021 | Hamilton County Speedway - Webster City, IA Karl Chevrolet Driver Appreciation Night A Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Darwin Karau (USRA Modifieds) | 6th | - | - | 5th |
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| 9/4/2021 | Deer Creek Speedway - Spring Valley, MN 16th Annual USMTS Labor Day Duel A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods, USRA Late Models, USRA Stock Cars | Results | | Darwin Karau (A Modifieds) | 7th | - | 12th | - |
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| 9/10/2021 | Chateau Speedway - Lansing, MN Spirit of 83 Rescheduled Event Night USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Hornet | Results | | Darwin Karau (USRA Modifieds) | 2nd | - | - | 24th (DNF) |
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| 9/23/2021 | Deer Creek Speedway - Spring Valley, MN 23rd Annual Featherlite Fall Jamboree USRA B-Mods, USRA Modifieds | Results | | Darwin Karau (USRA Modifieds) | 10th | - | 15th | - |
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| 9/24/2021 | Deer Creek Speedway - Spring Valley, MN 23rd Annual Featherlite Fall Jamboree A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods | Results | | Darwin Karau (A Modifieds) | 8th | - | 17th | - |
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| 9/25/2021 | Deer Creek Speedway - Spring Valley, MN 23rd Annual Featherlite Fall Jamboree A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods | Results | | Darwin Karau (A Modifieds) | 8th | - | 17th | - |
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| 10/1/2021 | Mississippi Thunder Speedway - Fountain City, WI The Great Pumpkin Race Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks, USRA Stock Cars | Results | | Darwin Karau (USRA Modifieds) | 6th | - | - | 22nd (DNF) |
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| 10/16/2021 | Mason City Motor Speedway - Mason City, IA Five Star Classic 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Darwin Karau (USRA Modifieds) | 3rd | - | - | 10th |
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| 10/23/2021 | Hamilton County Speedway - Webster City, IA Fall Futurity Night #2 Dirt Super Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Darwin Karau (USRA Modifieds) | 10th (DNF) | - | - | 17th |
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