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| 5/1/2015 | Rapid Speedway - Rock Rapids, IA Regular Classes + MSTS 360 Sprints 360 Sprints - Winged: Midwest Sprint Touring Series DIRTcar Sportsmans, Hobby Stocks, Stock Cars, B Modifieds | Results | | Darwin Klaassen (Stock Cars) | 2nd | - | - | 5th |
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| 5/8/2015 | Rapid Speedway - Rock Rapids, IA Regular Classes DIRTcar Sportsmans, Hobby Stocks, Stock Cars, Winged Outlaw, Winged A-Class, B Modifieds | Results | | Darwin Klaassen (Stock Cars) | 6th (DNF) | - | - | 10th |
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| 5/22/2015 | Rapid Speedway - Rock Rapids, IA Regular Classes + LMSS DIRTcar Late Models, DIRTcar Sportsmans, Hobby Stocks, Stock Cars, Winged Outlaw, Stock Non-Wing, B Modifieds | Results | | Darwin Klaassen (Stock Cars) | 4th | - | - | 3rd |
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| 6/5/2015 | Rapid Speedway - Rock Rapids, IA Regular Classes + USRA Ironman Stock Car & B-Mod DIRTcar Sportsmans, Hobby Stocks, Stock Cars, Winged Outlaw, Winged A-Class, B Modifieds | Results | | Darwin Klaassen (Stock Cars) | 7th | - | - | 10th |
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| 6/19/2015 | Rapid Speedway - Rock Rapids, IA Regular Classes + OneMain Financial WISSOTA Late Model Challenge Series DIRTcar Sportsmans, Hobby Stocks, Stock Cars, B Modifieds, Dirt Late Models | Results | | Darwin Klaassen (Stock Cars) | 2nd | - | - | 4th |
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| 6/26/2015 | Rapid Speedway - Rock Rapids, IA Regular Classes + MSTS 360 Sprints (Mid-Season Championship) 360 Sprints - Winged: Minnesota Mafia with Midwest Sprint Touring Series DIRTcar Sportsmans, Hobby Stocks, Stock Cars, B Modifieds | Results | | Darwin Klaassen (Stock Cars) | 5th | - | - | 7th |
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| 7/10/2015 | Rapid Speedway - Rock Rapids, IA Regular Classes + Sportsmans Special DIRTcar Sportsmans, Hobby Stocks, Stock Cars, B Modifieds | Results | | Darwin Klaassen (Stock Cars) | 7th (DNF) | - | - | 10th (DNF) |
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| 7/17/2015 | Rapid Speedway - Rock Rapids, IA Regular Classes + Hobby Stock Special DIRTcar Sportsmans, Hobby Stocks, Stock Cars, Stock Non-Wing, B Modifieds, Generic 1 | Results | | Darwin Klaassen (Stock Cars) | 3rd | - | - | 10th |
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| 8/21/2015 | Rapid Speedway - Rock Rapids, IA Regular Classes DIRTcar Sportsmans, Hobby Stocks, Stock Cars, B Modifieds | Results | | Darwin Klaassen (Stock Cars) | 4th | - | - | 1st |
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| 9/11/2015 | Rapid Speedway - Rock Rapids, IA Craig Vinson Memorial Rapid Speedway Nationals 360 Sprints - Winged: Midwest Sprint Touring Series Hobby Stocks, Stock Cars, Winged A-Class, B Modifieds, Generic 1 | Results | | Darwin Klaassen (Stock Cars) | 7th (DNF) | - | - | 12th (DNF) |
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| 9/12/2015 | Rapid Speedway - Rock Rapids, IA Craig Vinson Memorial Rapid Speedway Nationals 360 Sprints - Winged: Midwest Sprint Touring Series Hobby Stocks, Stock Cars, Stock Non-Wing, B Modifieds, Generic 1 | Results | | Darwin Klaassen (Stock Cars) | 3rd | - | - | 6th |
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