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| 4/16/2021 | Cedar Lake Speedway - New Richmond, WI Legendary Opener Day 2 Limited Sprints - Winged: Upper Midwest Sprint Car Series 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series A Modifieds, Midwest Modifieds, Street Stocks, Dirt Late Models, 305 Sprints - Non-Winged, Pony Stock, Super Stocks, Pure Stock, USRA Late Models | Results | | Colin Wittenberg (Pony Stock) | - | - | - | 23rd (DNF) |
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| 4/17/2021 | Cedar Lake Speedway - New Richmond, WI Legendary Open Day 3 Limited Sprints - Winged: Upper Midwest Sprint Car Series 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series A Modifieds, Midwest Modifieds, Street Stocks, Dirt Late Models, 305 Sprints - Non-Winged, Pony Stock, Super Stocks, Pure Stock, USRA Late Models | Results | | Colin Wittenberg (Pony Stock) | - | - | - | 13th |
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| 4/23/2021 | Mississippi Thunder Speedway - Fountain City, WI 13th Annual Season Opener presented by Kelly Iverson Trucking Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Results | | Colin Wittenberg (Hornets) | 7th | - | - | 20th |
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| 4/30/2021 | Mississippi Thunder Speedway - Fountain City, WI Weekly Racing Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Results | | Colin Wittenberg (Hornets) | 5th | - | - | 13th (DNF) |
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| 5/14/2021 | Mississippi Thunder Speedway - Fountain City, WI Weekly Racing Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Rain Out |
| 5/21/2021 | Princeton Speedway - Princeton, MN Hobby Stocks, A Modifieds, B Modifieds, Sport Compact, IMCA Stock Car, WISSOTA Mod Four, WISSOTA Super Stock | Results | | Colin Wittenberg (Sport Compact) | 7th | - | - | 9th |
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| 5/28/2021 | Princeton Speedway - Princeton, MN Late Model Show WISSOTA Late Model: Wissota Late Model Challenge Series Hobby Stocks, Sport Compact, IMCA Stock Car | Results | | Colin Wittenberg (Sport Compact) | 1st | - | - | 14th (DNF) |
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| 5/29/2021 | Cedar Lake Speedway - New Richmond, WI Pack The Track Night / Cook Memorial Winged A-Class, Pony Stock, Super Stocks, USRA Late Models | Results | | Colin Wittenberg (Pony Stock) | 7th | - | - | 13th |
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| 5/30/2021 | Ogilvie Raceway - Ogilvie, MN MN Modified Nationals presented by FYE Motorsports WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Super Stock, WISSOTA Hornet | Results | | Colin Wittenberg (WISSOTA Hornet) | 7th (DNF) | - | - | 14th |
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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 | | Colin Wittenberg (WISSOTA Hornet) | 7th (DNF) | - | - | 13th |
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| 6/11/2021 | Mississippi Thunder Speedway - Fountain City, WI Weekly Racing Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Results | | Colin Wittenberg (Hornets) | 6th | - | - | 7th |
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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 | | Colin Wittenberg (WISSOTA Hornet) | 3rd | - | - | 3rd |
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| 6/25/2021 | Chateau Speedway - Lansing, MN Wissota Midwest Mod vs. Usra B Mod Challenge Event Night 1 Winged Outlaw, USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Hornet | Results | | Colin Wittenberg (WISSOTA Hornet) | 4th | - | - | 8th |
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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 | | Colin Wittenberg (Hornets) | 3rd | - | - | 10th |
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| 7/9/2021 | Red Cedar Speedway - Menomonie, WI Military Night: All Military Personnel Get in FREE with Military I.D. Hornets, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Colin Wittenberg (Hornets) | 2nd | - | - | 10th (DNF) |
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| 7/16/2021 | Chateau Speedway - Lansing, MN UMSS Non Wing Traditional Sprint Special #2 360 Sprints - Non-Winged, USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Hornet | Results | | Colin Wittenberg (WISSOTA Hornet) | 2nd | - | - | 1st |
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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 | | Colin Wittenberg (WISSOTA Hornet) | 1st | - | - | 9th (DNF) |
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| 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 | | Colin Wittenberg (WISSOTA Hornet) | 3rd | - | - | 13th |
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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 | | Colin Wittenberg (WISSOTA Hornet) | 2nd | - | - | 4th |
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| 8/20/2021 | Chateau Speedway - Lansing, MN Kids Night-Car Rides and Bicycle give aways USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Hornet | Results | | Colin Wittenberg (WISSOTA Hornet) | 1st | - | - | 3rd |
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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 | | Colin Wittenberg (WISSOTA Hornet) | 4th | - | - | 3rd |
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| 9/11/2021 | Chateau Speedway - Lansing, MN National Points Special USRA B-Mods, USRA Modifieds, WISSOTA Midwest Mods, WISSOTA Pure Stock, WISSOTA Street Stock, WISSOTA Hornet | Results | | Colin Wittenberg (WISSOTA Hornet) | 4th | - | - | 5th |
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| 9/16/2021 | Cedar Lake Speedway - New Richmond, WI 16th Annual Legendary 100 Night 1 Limited Sprints - Winged: Upper Midwest Sprint Car Series 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series A Modifieds, Midwest Modifieds, Street Stocks, Dirt Late Models, 305 Sprints - Non-Winged, Pony Stock, Super Stocks, Pure Stock, USRA Late Models, WISSOTA Midwest Mods | Results | | Colin Wittenberg (Pony Stock) | - | - | - | 13th |
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| 9/17/2021 | Cedar Lake Speedway - New Richmond, WI 16th Annual Legendary 100 Night 2 Limited Sprints - Winged: Upper Midwest Sprint Car Series 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series A Modifieds, Midwest Modifieds, Street Stocks, Dirt Late Models, 305 Sprints - Non-Winged, Pony Stock, Super Stocks, Pure Stock, USRA Late Models, WISSOTA Midwest Mods | Results | | Colin Wittenberg (Pony Stock) | - | - | - | 11th |
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| 9/18/2021 | Cedar Lake Speedway - New Richmond, WI 16th Annual Legendary 100 Night 3 Limited Sprints - Winged: Upper Midwest Sprint Car Series 360 Sprints - Non-Winged: UMSS - Traditional Sprint Car Series A Modifieds, Midwest Modifieds, Street Stocks, Dirt Late Models, 305 Sprints - Non-Winged, Pony Stock, Super Stocks, Pure Stock, USRA Late Models, WISSOTA Midwest Mods | Results | | Colin Wittenberg (Pony Stock) | - | - | - | 7th |
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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 | | Colin Wittenberg (Hornets) | DNS | - | - | 11th |
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| 10/2/2021 | 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 | | Colin Wittenberg (Hornets) | 5th | - | - | 21st (DNF) |
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