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| 2/2/2021 | Volusia Speedway Park - De Leon Springs, FL 50th Annual DIRTcar Nationals - Night #1 410 Sprints - Winged, DIRTcar UMP Modifieds | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 8th | - | 4th | - |
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| 2/3/2021 | Volusia Speedway Park - De Leon Springs, FL DIRTcar Nationals $6,000 to win 410 Sprints - Winged: All Star Circuit of Champions DIRTcar UMP Modifieds | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | DNS | - | DNS | - |
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| 2/4/2021 | Volusia Speedway Park - De Leon Springs, FL DIRTcar Nationals $6,000 to win 410 Sprints - Winged: All Star Circuit of Champions DIRTcar UMP Modifieds | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 7th | - | DNS | - |
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| 2/5/2021 | Volusia Speedway Park - De Leon Springs, FL 50th Annual DIRTcar Nationals - Night #4 (DIRTcar UMP Modifieds Gator Championship Night 1) 410 Sprints - Winged: World of Outlaws DIRTcar UMP Modifieds | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | - | - | - | - |
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| 2/7/2021 | Volusia Speedway Park - De Leon Springs, FL 50th Annual DIRTcar Nationals - Night #6 (DIRTcar UMP Modifieds Gator Championship Night 3) 410 Sprints - Winged: World of Outlaws DIRTcar UMP Modifieds | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 7th | - | 2nd | - |
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| 2/8/2021 | Volusia Speedway Park - De Leon Springs, FL 50th Annual DIRTcar Nationals - Night #7 (DIRTcar UMP Modifieds Gator Championship Night 4) Dirt Super Late Models, DIRTcar UMP Modifieds, CRUSA Dirt Late Models, DIRTcar Pro Late Models | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | - | - | DNS | - |
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| 4/2/2021 | Winston Speedway - Rothbury, MI Player Hater Asphalt Mini Stocks, Stock Cars, Sportsmans, Street Stocks, Dirt Late Models, Hornets, Mini Wedge, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 1st | - | - | 5th |
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| 4/23/2021 | I-96 Speedway - Lake Odessa, MI Non Wing Challenge Night 1 DIRTcar Late Models, B Modifieds, Street Stocks, 410 Sprints - Non-Winged, Sport Compact | Results | | Collin Thirlby (B Modifieds) | 2nd | - | - | 2nd |
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| 5/1/2021 | Merritt Speedway - Merritt, MI Opening Night at Merritt Speedway DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 5th | - | - | 6th | | Collin Thirlby (B Modifieds) | 2nd | - | - | 2nd |
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| 5/14/2021 | Tri-City Motor Speedway - Auburn, MI Allstar Performance Challenge Race #1 & $1,500 to win PRO STOCK NIGHT DIRTcar Late Models: Allstar Performance Challenge Series Factory Stocks, Hobby Stocks, Sportsmans, A Modifieds, Street Stocks, Dirt Late Models, Mini Wedge, Mini Outlaws, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 7th | - | - | 4th |
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| 5/15/2021 | Merritt Speedway - Merritt, MI Allstar Performance Challenge Race #2 & $1,500 to win PRO STOCK NIGHT DIRTcar Late Models: Allstar Performance Challenge Series DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 4th | - | - | 4th | | Collin Thirlby (B Modifieds) | 1st | - | - | 2nd |
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| 5/22/2021 | Merritt Speedway - Merritt, MI Factory Stock - $1500 to WIN & 4-6 CYL - $600 TO WIN DIRTcar Late Models, Factory Stocks, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (B Modifieds) | 1st | - | - | 1st |
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| 5/29/2021 | Merritt Speedway - Merritt, MI MEMORIAL DAY CELEBRATION - DAY 1 DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 3rd | 1st | - | 3rd | | Collin Thirlby (B Modifieds) | 1st | - | - | 1st |
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| 5/30/2021 | Merritt Speedway - Merritt, MI MEMORIAL DAY - DAY 2 & ALLSTAR PERFORMANCE CHALLENGE SERIES RACE #4 & UMP MODS $2000 TO WIN DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | - | - | - | 20th | | Collin Thirlby (B Modifieds) | - | - | - | 1st |
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| 6/4/2021 | Tri-City Motor Speedway - Auburn, MI FACTORY STOCK NIGHT - $2000 TO WIN DIRTcar Late Models, Factory Stocks, Hobby Stocks, Mini Wedge, Mini Outlaws, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 1st | - | - | 1st |
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| 6/5/2021 | Merritt Speedway - Merritt, MI FACTORY STOCK NIGHT - $2000 TO WIN DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (B Modifieds) | 2nd | - | - | 3rd |
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| 6/12/2021 | Merritt Speedway - Merritt, MI PRO STOCK NIGHT - $2000 TO WIN DIRTcar Late Models, DIRTcar UMP Modifieds, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | - | - | - | - | | Collin Thirlby (B Modifieds) | - | - | - | 16th |
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| 6/18/2021 | Tri-City Motor Speedway - Auburn, MI IMCA Mod Fast Shafts $2000 TO WIN & 4-6 CYL $1000 TO WIN Factory Stocks, Hobby Stocks, Sportsmans, Street Stocks, Mini Wedge, Mini Outlaws, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 1st | - | - | 6th |
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| 6/19/2021 | Merritt Speedway - Merritt, MI Lightning Sprints: Great Lakes Lightning Sprints DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 4th | - | - | 10th | | Collin Thirlby (B Modifieds) | 3rd | - | - | 2nd |
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| 6/24/2021 | Princeton Speedway - Princeton, MN Siercks Memorial Hobby Stocks, A Modifieds, B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Collin Thirlby (A Modifieds) | - | - | - | - | | Collin Thirlby (IMCA Modified) | 2nd | - | - | 16th |
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| 6/25/2021 | North Central Speedway - Brainerd, MN 10000 lakes 10k A Modifieds, B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Collin Thirlby (IMCA Modified) | 1st | - | - | 7th |
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| 6/26/2021 | North Central Speedway - Brainerd, MN 10000 lakes 10k IMCA Modified: Land of Ten Thousand Lakes 10K A Modifieds, B Modifieds, IMCA Northern SportMod, IMCA Stock Car | Results | | Collin Thirlby (IMCA Modified) | 2nd | - | - | 22nd (DNF) |
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| 6/27/2021 | Granite City Motor Park - Sauk Rapids, MN IMCA - $10K to Win! IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Collin Thirlby (IMCA Modified) | 6th | - | 6th | - |
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| 7/2/2021 | Tri-City Motor Speedway - Auburn, MI ALLSTAR PERFORMANCE CHALLENGE SERIES RACES DIRTcar Late Models: Allstar Performance Challenge Series Factory Stocks, Hobby Stocks, Sportsmans, Mini Wedge, Mini Outlaws, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 1st | - | - | 4th |
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| 7/3/2021 | Merritt Speedway - Merritt, MI INDEPENDENCE DAY CELEBRATION - DAY 1 DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 4th | - | - | 4th | | Collin Thirlby (B Modifieds) | 4th | - | - | 4th |
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| 7/4/2021 | Merritt Speedway - Merritt, MI INDEPENDENCE DAY - DAY 2 | ALLSTAR PERFORMANCE CHALLENGE SERIES RACES DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 1st | - | - | 3rd | | Collin Thirlby (B Modifieds) | 2nd | - | - | 2nd |
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| 7/9/2021 | Tri-City Motor Speedway - Auburn, MI 4-6 CYL & FS NIGHT DIRTcar Late Models, Factory Stocks, Hobby Stocks, Sportsmans, Mini Wedge, Mini Outlaws, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 3rd | - | - | 1st |
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| 7/10/2021 | 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, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 1st | - | - | 2nd | | Collin Thirlby (B Modifieds) | 3rd | - | - | 3rd |
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| 7/23/2021 | Tri-City Motor Speedway - Auburn, MI Challenge Series Races, 4-6 CYL NIGHT - $1500 TO WIN DIRTcar Late Models, Factory Stocks, Hobby Stocks, Sportsmans, Mini Wedge, Mini Outlaws, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 3rd | - | - | 2nd |
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| 7/30/2021 | Tri-City Motor Speedway - Auburn, MI Pro Stock & Mod Night $1,500 to win! DIRTcar Late Models, Factory Stocks, Hobby Stocks, Sportsmans, Mini Wedge, Mini Outlaws, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 2nd | - | - | 4th |
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| 7/31/2021 | Merritt Speedway - Merritt, MI B-MODIFIED & PRO STOCK NIGHT DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (B Modifieds) | - | - | - | - |
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| 8/6/2021 | Merritt Speedway - Merritt, MI 33RD ANNUAL WOOD TIC - DAY 1 DIRTcar Late Models: Allstar Performance Challenge Series DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 2nd | - | - | - | | Collin Thirlby (B Modifieds) | 1st | 2nd | - | - |
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| 8/7/2021 | Merritt Speedway - Merritt, MI 33RD ANNUAL WOOD TIC - DAY 2 | ALLSTAR PERFORMANCE CHALLENGE SERIES RACES DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | - | - | - | 4th | | Collin Thirlby (B Modifieds) | - | - | - | 1st |
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| 8/13/2021 | Tri-City Motor Speedway - Auburn, MI FAN APPRECIATION NIGHT DIRTcar Late Models, Factory Stocks, Hobby Stocks, Sportsmans, Mini Wedge, Mini Outlaws, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 3rd | - | - | 5th |
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| 8/20/2021 | Tri-City Motor Speedway - Auburn, MI DIRTcar Summer Nationals HELL TOUR & PRO STOCK NIGHT $3000 TO WIN DIRTcar Late Models: DIRTcar Summer Nationals DIRTcar UMP Modifieds: DIRTcar Modified Nationals Factory Stocks, Hobby Stocks, Sportsmans, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 2nd | - | - | 6th |
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| 8/21/2021 | Merritt Speedway - Merritt, MI DIRTcar Late Models: DIRTcar Summer Nationals DIRTcar UMP Modifieds: DIRTcar Modified Nationals Lightning Sprints: Great Lakes Lightning Sprints Factory Stocks, Hobby Stocks, Sportsmans, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 4th | - | - | 5th |
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| 8/27/2021 | Tri-City Motor Speedway - Auburn, MI MIDWEST COMPACT TOUR $1500 TO WIN & IMCA MODS $1000 TO WIN DIRTcar Late Models, Factory Stocks, Hobby Stocks, Sportsmans, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 1st | - | - | 1st |
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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 | | Collin Thirlby (IMCA Modified) | 2nd | - | - | 1st |
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| 9/4/2021 | Merritt Speedway - Merritt, MI GENE KREGEAR CHAMPIONSHIP WEEKEND - DAY 1 DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 4th | - | - | 3rd | | Collin Thirlby (B Modifieds) | 2nd | - | - | 1st |
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| 9/5/2021 | Merritt Speedway - Merritt, MI GENE KREGEAR CHAMPIONSHIP WEEKEND - DAY 2 & ALLSTAR PERFORMANCE CHALLENGE SERIES RACE #9 DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (DIRTcar UMP Modifieds) | 6th | - | - | 7th | | Collin Thirlby (B Modifieds) | 1st | - | - | 17th |
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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 | | Collin Thirlby (B Modifieds) | 6th | - | - | 14th |
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| 9/17/2021 | Tri-City Motor Speedway - Auburn, MI BATTLE BY THE BAY - DAY 1 DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Sportsmans, Mini Wedge, Mini Outlaws, IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 6th | - | - | 5th |
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| 9/18/2021 | Tri-City Motor Speedway - Auburn, MI BATTLE BY THE BAY - DAY 2 DIRTcar Late Models, DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Sportsmans, B Modifieds, Mini Wedge, Mini Outlaws | Results | | Collin Thirlby (B Modifieds) | 1st | - | - | 2nd |
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| 9/22/2021 | Batesville Motor Speedway - Locust Grove, AR 5th Annual Race 4 Hope 71 IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 7th (DNF) | - | - | - |
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| 9/23/2021 | Batesville Motor Speedway - Locust Grove, AR 5th Annual Race 4 Hope 71 IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 2nd | - | - | 14th |
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| 9/24/2021 | Batesville Motor Speedway - Locust Grove, AR 5th Annual Race 4 Hope 71 IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | 1st | - | - | 3rd |
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| 9/25/2021 | Batesville Motor Speedway - Locust Grove, AR 5th Annual Race 4 Hope 71 IMCA Modified | Results | | Collin Thirlby (IMCA Modified) | - | - | - | 10th |
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