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| 6/19/2021 | Crystal Motor Speedway - Crystal, MI Full Show - Sponsored by Carson City Lumber Hobby Stocks, A Modifieds, Street Stocks, Dirt Late Models, Dirt Pro Trucks, Sport Compact | Results | | Zac Gilliland (A Modifieds) | 6th | - | 4th | 8th |
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| 7/3/2021 | Crystal Motor Speedway - Crystal, MI 360 Sprints - Winged: GLSS-Great Lakes Super Sprints Hobby Stocks, A Modifieds, Street Stocks, Dirt Late Models, Junior 1 Lites Dirt Karts, Mini Wedge, Sport Compact | Results | | Zac Gilliland (A Modifieds) | 4th | - | - | 12th |
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| 7/10/2021 | Crystal Motor Speedway - Crystal, MI S.O.D. Sprints - NO PRO STOCKS Hobby Stocks, A Modifieds, Street Stocks, Dirt Late Models, Dirt Pro Trucks, Sport Compact | Results | | Zac Gilliland (A Modifieds) | 7th | - | - | 17th |
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| 7/17/2021 | Crystal Motor Speedway - Crystal, MI YES 2 KIDS - Autographs from 6:00-7:00 p.m. Hobby Stocks, A Modifieds, Street Stocks, Dirt Late Models, Junior 1 Lites Dirt Karts, Dirt Pro Trucks, Mini Wedge, Sport Compact | Results | | Zac Gilliland (A Modifieds) | 11th | - | - | 18th |
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| 8/7/2021 | Crystal Motor Speedway - Crystal, MI Full Show - Sponsored by H & H EXCAVATING Hobby Stocks, A Modifieds, Street Stocks, Dirt Late Models, Junior 1 Lites Dirt Karts, Dirt Pro Trucks, Mini Wedge, Sport Compact | Results | | Zac Gilliland (A Modifieds) | 6th | - | - | 15th |
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| 8/13/2021 | I-96 Speedway - Lake Odessa, MI Back To School Night - $30 For 2 Adults / 2 Kids DIRTcar Late Models, B Modifieds, Street Stocks, Mini Wedge, Mini Outlaws, Sport Compact | Results | | Zac Gilliland (B Modifieds) | 6th | - | - | 13th (DNF) |
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| 8/14/2021 | Crystal Motor Speedway - Crystal, MI G.L.O.W. Vintage Modifieds - Sponsored by Engine Pro Hobby Stocks, A Modifieds, Street Stocks, Dirt Late Models, Junior 1 Lites Dirt Karts, Dirt Pro Trucks, Mini Wedge, Sport Compact | Results | | Zac Gilliland (A Modifieds) | 7th | - | - | 13th |
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| 8/20/2021 | I-96 Speedway - Lake Odessa, MI $5,000 to win 410 Sprints - Winged: All Star Circuit of Champions B Modifieds, Street Stocks | Results | | Zac Gilliland (B Modifieds) | 5th | - | - | 15th |
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| 8/21/2021 | Crystal Motor Speedway - Crystal, MI Full Show Hobby Stocks, A Modifieds, Street Stocks, Dirt Late Models, Junior 1 Lites Dirt Karts, Dirt Pro Trucks, Mini Wedge, Sport Compact | Results | | Zac Gilliland (A Modifieds) | 7th | - | - | 8th |
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| 8/27/2021 | I-96 Speedway - Lake Odessa, MI Non Wing Challenge - Night 5 DIRTcar Late Models, B Modifieds, Street Stocks, 410 Sprints - Non-Winged, Mini Wedge, Mini Outlaws, Sport Compact | Results | | Zac Gilliland (B Modifieds) | 4th | - | - | 10th |
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| 9/3/2021 | Tri-City Motor Speedway - Auburn, MI ALLSTAR PERFORMANCE CHALLENGE SERIES RACE DIRTcar Late Models: Allstar Performance Challenge Series Factory Stocks, Hobby Stocks, Sportsmans, Mini Wedge, Mini Outlaws, IMCA Modified | Results | | Zac Gilliland (IMCA Modified) | 6th | - | 3rd | 18th |
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| 9/10/2021 | Tri-City Motor Speedway - Auburn, MI 360 Sprints - Winged: GLSS-Great Lakes Super Sprints 410 Sprints - Non-Winged: Great Lakes Traditional Sprints Lightning Sprints: Great Lakes Lightning Sprints DIRTcar UMP Modifieds, B Modifieds | Results | | Zac Gilliland (B Modifieds) | 8th | - | - | 9th |
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| 9/11/2021 | Merritt Speedway - Merritt, MI 360 Sprints - Winged: GLSS-Great Lakes Super Sprints 410 Sprints - Non-Winged: Great Lakes Traditional Sprints Lightning Sprints: Great Lakes Lightning Sprints DIRTcar UMP Modifieds, Hobby Stocks, B Modifieds | Results | | Zac Gilliland (B Modifieds) | 4th | - | - | 6th |
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| 9/18/2021 | Crystal Motor Speedway - Crystal, MI Great Lakes Nationals 410 Sprints - Non-Winged: Great Lakes Traditional Sprints Hobby Stocks, A Modifieds, Street Stocks, Dirt Late Models, Junior 1 Lites Dirt Karts, Dirt Pro Trucks, Mini Wedge, Sport Compact | Results | | Zac Gilliland (A Modifieds) | 7th | - | 6th | - |
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| 10/8/2021 | I-96 Speedway - Lake Odessa, MI Roll The Dice II - Night 1 410 Sprints - Non-Winged: Great Lakes Traditional Sprints with BOSS Buckeye Outlaw Sprint Series B Modifieds, Street Stocks, Mini Wedge, Mini Outlaws, Sport Compact | Rain Out |
| 10/9/2021 | I-96 Speedway - Lake Odessa, MI Roll The Dice II - Night 2 410 Sprints - Non-Winged: Great Lakes Traditional Sprints DIRTcar Late Models, DIRTcar UMP Modifieds, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Zac Gilliland (B Modifieds) | 6th | - | - | 11th |
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