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| 4/3/2021 | Hamilton County Speedway - Webster City, IA USMTS Spring Challenge A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Zac Smith (USRA Hobby Stocks) | 6th | - | - | 7th |
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| 4/17/2021 | Hamilton County Speedway - Webster City, IA Malvern Bank $3,000-to-Win Late Models Dirt Super Late Models: SLMR Late Model Series USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | 2nd | - | - | 9th |
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| 4/24/2021 | Hamilton County Speedway - Webster City, IA Modified Madness $2,000-to-Win Mods A Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | 3rd | - | - | 18th (DNF) |
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| 5/15/2021 | Hamilton County Speedway - Webster City, IA Kid's Night + $1,000-to-Win Mods USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | 1st | - | - | 12th (DNF) |
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| 5/22/2021 | Hamilton County Speedway - Webster City, IA Bob Flaws Memorial + Stock Car Challenge $1,600-to-Win USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | 3rd | - | - | 9th |
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| 5/30/2021 | Winneshiek Raceway - Decorah, IA 13th Annual USMTS Nordic Nationals A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Zac Smith (USRA Hobby Stocks) | 3rd | - | - | 13th |
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| 6/5/2021 | Hamilton County Speedway - Webster City, IA USMTS $10,000-to-Win A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | 2nd | - | - | 6th |
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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 | | Zac Smith (USRA Hobby Stocks) | 2nd | - | - | 2nd |
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| 7/2/2021 | Sports Park Raceway - Fort Dodge, IA 4th of July Spectacular USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | 2nd | - | - | 4th |
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| 7/11/2021 | Mason City Motor Speedway - Mason City, IA Joel Showalter Memorial Presented by Window World 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars | Results | | Zac Smith (USRA Hobby Stocks) | 2nd | - | - | 5th |
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| 7/18/2021 | Mason City Motor Speedway - Mason City, IA United States Modified Touring Series fueled by Casey's A Modifieds: USMTS - United States Modified Touring Series 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars | Results | | Zac Smith (USRA Hobby Stocks) | 1st | - | - | 2nd |
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| 7/21/2021 | Hamilton County Speedway - Webster City, IA Wildcard Wednesday Presented by Peoples Credit Union Dirt Super Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | 2nd | - | - | 5th |
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| 7/25/2021 | Mason City Motor Speedway - Mason City, IA Kids Night 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars | Results | | Zac Smith (USRA Hobby Stocks) | 1st | - | - | 2nd |
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| 8/1/2021 | Mason City Motor Speedway - Mason City, IA Modified Madness Presented by Fertilizer Equipment Specialists USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | 1st | - | - | 4th |
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| 8/7/2021 | Hamilton County Speedway - Webster City, IA Napa Auto Parts USRA Weekly Racing + Hobby Stock Special Super Truck, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | 3rd | - | - | 18th (DNF) |
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| 8/8/2021 | Mason City Motor Speedway - Mason City, IA Ted Zieman Memorial (Fair Races) Presented by Pabst Blue Ribbon 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars | Results | | Zac Smith (USRA Hobby Stocks) | 2nd | - | - | 6th |
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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 | | Zac Smith (USRA Hobby Stocks) | 2nd | - | - | 9th |
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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 | | Zac Smith (USRA Hobby Stocks) | 5th | - | - | 5th |
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| 9/18/2021 | Deer Creek Speedway - Spring Valley, MN Stock Car Nationals USRA Hobby Stocks, USRA Stock Cars | Results | | Zac Smith (USRA Hobby Stocks) | 3rd | - | 3rd | 14th |
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| 10/6/2021 | Lucas Oil Speedway - Wheatland, MO Practice Night USRA Stock Cars: USRA Nationals USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | - | - | - | - |
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| 10/7/2021 | Lucas Oil Speedway - Wheatland, MO 8th Annual Summit USRA Nationals Presented by MyRacePass USRA Stock Cars: USRA Nationals USRA B-Mods, USRA Modifieds, USRA Hobby Stocks | Results | | Zac Smith (USRA Hobby Stocks) | 1st | - | - | 27th (DNF) |
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| 10/8/2021 | Lucas Oil Speedway - Wheatland, MO 8th Annual Summit USRA Nationals Presented by MyRacePass USRA Stock Cars: USRA Nationals USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | 2nd | - | - | 15th |
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| 10/9/2021 | Lucas Oil Speedway - Wheatland, MO 8th Annual Summit USRA Nationals Presented by MyRacePass USRA Stock Cars: USRA Nationals USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Tuners | Results | | Zac Smith (USRA Hobby Stocks) | - | - | 12th | 22nd |
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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 | | Zac Smith (USRA Hobby Stocks) | 5th | - | - | 13th (DNF) |
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| 10/17/2021 | 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 | | Zac Smith (USRA Hobby Stocks) | 2nd | - | - | 8th |
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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 | | Zac Smith (USRA Hobby Stocks) | 6th | - | - | 9th |
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