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| 5/8/2020 | US 36 Raceway - Osborn, MO Weekly Racing Series 305 Sprints - Winged, Stock Cars, A Modifieds, B Modifieds, Limited Sport Mod, Pure Stock | Results | | Marvin Griffith Jr (Stock Cars) | 3rd | - | - | 4th |
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| 5/9/2020 | Bethany Fairgrounds Speedway - Bethany, MO Season Championship Race 305 Sprints - Winged, A Modifieds, B Modifieds, Street Stocks, Limited Sport Mod, Pure Stock, IMCA RaceSaver Sprint Car | Results | | Marvin Griffith Jr (Street Stocks) | 3rd | - | - | 13th |
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| 6/6/2020 | Bethany Fairgrounds Speedway - Bethany, MO POWRi Iowa Sprint Car League at Bethany Fairgrounds Speedway Non-Winged Sprints: POWRi WAR Sprints with Iowa Sprint Car League A Modifieds, B Modifieds, Street Stocks, 360 Sprints - Non-Winged, Limited Sport Mod, Pure Stock, IMCA RaceSaver Sprint Car | Results | | Marvin Griffith Jr (Street Stocks) | 2nd | - | - | 6th |
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| 8/21/2020 | US 36 Raceway - Osborn, MO POWRi Iowa Sprint Car League at US 36 Raceway Non-Winged Sprints: Midwest Wingless Racing Association 305 Sprints - Winged, Stock Cars, A Modifieds, Pure Stock | Results | | Marvin Griffith Jr (Stock Cars) | 7th | - | - | 16th |
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| 8/22/2020 | Bethany Fairgrounds Speedway - Bethany, MO Non-Winged Sprints: Iowa Sprint Car League A Modifieds, B Modifieds, Street Stocks, Limited Sport Mod, Pure Stock, IMCA RaceSaver Sprint Car | Results | | Marvin Griffith Jr (Street Stocks) | 3rd | - | - | 13th |
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| 8/30/2020 | Concordia Raceway - Concordia, KS Asphalt Mini Stocks, Non-Wing Outlaw, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, Mod Lites | Results | | Marvin Griffith Jr (IMCA Stock Car) | 1st | - | - | 1st |
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| 10/17/2020 | Beatrice Speedway - Beatrice, NE Octoberfest Night 2 Complete Program Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, IMCA Late Models, Sport Compact | Results | | Marvin Griffith Jr (Stock Cars) | 7th (DNF) | - | - | 22nd (DNF) |
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