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| 4/2/2021 | Marshalltown Speedway - Marshalltown, IA 141 Speedway / Left Turn Lounge IMCA FrostBuster IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Hobby Stock) | 10th | - | 5th | - |
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| 4/10/2021 | Boone Speedway - Boone, IA Season Opener IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Hobby Stock) | 6th | - | 1st | 19th |
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| 4/16/2021 | Marshalltown Speedway - Marshalltown, IA Hoker Trucking East Super Late Models Series Kevin "Sharp Shooter" Miller Lite 30 Dirt Super Late Models: SLMR Late Model Series Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Hobby Stock) | 5th | - | - | 16th |
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| 4/23/2021 | Marshalltown Speedway - Marshalltown, IA Sleeping Angel's Foundation Fundraiser Night Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Hobby Stock) | 4th | - | - | 8th |
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| 4/24/2021 | Boone Speedway - Boone, IA Saturday Night Series Weekly #3 IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Hobby Stock) | 4th | - | - | 23rd (DNF) |
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| 4/30/2021 | Marshalltown Speedway - Marshalltown, IA LOCAL UAW 893 Cliff Chambers Memorial Dwarf, Dirt Pro Trucks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Hobby Stock) | 2nd | - | - | 8th |
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| 5/6/2021 | Marshalltown Speedway - Marshalltown, IA Dale DeFrance Memorial Thursday Night Thunder Dwarf, IMCA Late Models, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Hobby Stock) | 2nd | - | - | 7th |
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| 5/8/2021 | Boone Speedway - Boone, IA Saturday Night Series Weekly #4 IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Rain Out |
| 5/14/2021 | Marshalltown Speedway - Marshalltown, IA Casey's Salute to Military / Haverhill Social Club Night Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Hobby Stock) | - | - | - | - |
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| 5/22/2021 | Boone Speedway - Boone, IA Saturday Night Series Weekly #6 Dirt Mini Trucks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Hobby Stock) | 1st | - | - | 8th |
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| 5/29/2021 | Boone Speedway - Boone, IA Saturday Night Series Weekly #7 IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Hobby Stock) | 7th | - | 3rd | 18th |
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| 6/4/2021 | Marshalltown Speedway - Marshalltown, IA Old Timers Lounge Night Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Hobby Stock) | 8th | - | - | 6th |
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| 6/5/2021 | Boone Speedway - Boone, IA Saturday Night Series Weekly #8 IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Hobby Stock) | 4th | - | - | 19th (DNF) |
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| 6/11/2021 | Marshalltown Speedway - Marshalltown, IA Casey's Salute to Marshalltown Firefighters, EMTs and First Responders Dwarf, IMCA Late Models, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Hobby Stock) | 4th | - | - | 8th |
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| 6/18/2021 | Marshalltown Speedway - Marshalltown, IA RBF Electric $400.00 to Win IMCA Hobby Stocks Dwarf, Dirt Pro Trucks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, Sportsman Dwarf | Results | | William Klosterman (IMCA Hobby Stock) | 6th | - | - | 17th (DNF) |
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| 6/25/2021 | Marshalltown Speedway - Marshalltown, IA KMJ Performance FREE GRANDSTANDS Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Hobby Stock) | 5th | - | - | 2nd |
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| 6/26/2021 | Boone Speedway - Boone, IA Saturday Night Series Weekly #11 + Hawkeye Challenge Stock Cars, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Hobby Stock) | 4th | - | - | 7th |
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| 7/2/2021 | Marshalltown Speedway - Marshalltown, IA Wolf Seeds Night Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Hobby Stock) | 1st | - | - | 20th (DNF) |
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| 7/16/2021 | Marshalltown Speedway - Marshalltown, IA Toby K's Hideaway $1,000.00 to Win IMCA Stock Cars Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Hobby Stock) | 2nd | - | - | 12th (DNF) |
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| 7/23/2021 | Marshalltown Speedway - Marshalltown, IA Rumours Bar & Grille Casey's Salute to Marshalltown Police Dwarf, Dirt Pro Trucks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Hobby Stock) | 6th | - | - | 12th |
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| 7/24/2021 | Hamilton County Speedway - Webster City, IA Kids Night At The Fair Presented by Good Life RV Dirt Super Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | William Klosterman (USRA Hobby Stocks) | 7th | - | - | 13th (DNF) |
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| 7/30/2021 | Marshalltown Speedway - Marshalltown, IA Triple E Insulators Night Dwarf, IMCA Late Models, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Rain Out |
| 8/6/2021 | Marshalltown Speedway - Marshalltown, IA Shawn's Custom Hay Grinding Night Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Hobby Stock) | 3rd | - | - | 5th |
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| 8/13/2021 | Marshalltown Speedway - Marshalltown, IA BHE Night $1,000.00 to Win IMCA Norther SportMods Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Hobby Stock) | 5th | - | - | 6th |
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| 8/20/2021 | Marshalltown Speedway - Marshalltown, IA Toby K's Hideaway Night Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Hobby Stock) | 3rd | - | - | 9th |
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