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| 4/28/2018 | Park Jefferson International Speedway - Jefferson, SD South Dakota Sprint Car Nationals 360 Sprints - Winged: Malvern Bank 360 Sprints with Midwest Sprint Touring Series, Nebraska 360 sprints 305 Sprints - Winged: IMCA RaceSaver Sprints Hobby Stocks, A Modifieds, B Modifieds | Results | | Jim Mathieson (A Modifieds) | 6th | - | - | 18th |
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| 5/5/2018 | Park Jefferson International Speedway - Jefferson, SD SLMR-Super Late Models plus IMCA Weekly Racing-Road to the Iron Cup IMCA Sport Mods Dirt Super Late Models: SLMR Late Model Series 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Mathieson (A Modifieds) | 8th | - | - | 15th |
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| 5/26/2018 | Park Jefferson International Speedway - Jefferson, SD 360 Sprints - Winged: Malvern Bank 360 Sprints with Midwest Sprint Touring Series, Nebraska 360 sprints 305 Sprints - Winged: IMCA RaceSaver Sprints Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Mathieson (A Modifieds) | 1st | - | - | 16th |
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| 6/2/2018 | Park Jefferson International Speedway - Jefferson, SD IMCA Weekly Racing-Road to the Iron Cup IMCA Hobby Stocks 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Mathieson (A Modifieds) | 5th | - | - | 16th |
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| 6/30/2018 | Park Jefferson International Speedway - Jefferson, SD IMCA Weekly Racing plus LMSS and Road To Iron Cup Sport Modifieds sponsored by Turner Plumbing 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Dirt Late Models, Hornets | Results | | Jim Mathieson (A Modifieds) | 6th | - | - | 15th |
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| 7/14/2018 | Park Jefferson International Speedway - Jefferson, SD IMCA Weekly Racing Kids Night presented by Z98 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Mathieson (A Modifieds) | 8th | - | - | 11th |
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| 7/23/2018 | Park Jefferson International Speedway - Jefferson, SD Storm Solution Specialists present IMCA Dirt Knights Modified Tour Invades Park Jefferson Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Mathieson (A Modifieds) | 7th | - | 9th | - |
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| 7/28/2018 | Park Jefferson International Speedway - Jefferson, SD Fabulous $5 Night by Liberty National Bank-IMCA Weekly Racing-Road to Iron Cup IMCA Stock Cars 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Mathieson (A Modifieds) | 7th (DNF) | - | - | 13th (DNF) |
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| 8/9/2018 | Hancock County Speedway - Britt, IA Night of 1000 Stars presented by Doug Studer Farms & Brakke Imp. Hobby Stocks, Stock Cars, A Modifieds, B Modifieds | Results | | Jim Mathieson (A Modifieds) | 8th (DNF) | - | 13th (DNF) | - |
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| 8/10/2018 | Hancock County Speedway - Britt, IA Night of 10,000 Stars Hobby Stocks, Stock Cars, A Modifieds, B Modifieds | Results | | Jim Mathieson (A Modifieds) | 8th | - | 14th | - |
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| 8/11/2018 | Hancock County Speedway - Britt, IA Bob Shryock Memorial All Stars presented by Lake Mills Motor Sports Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, 600cc Modifieds | Results | | Jim Mathieson (A Modifieds) | 6th | - | 15th | - |
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| 8/18/2018 | Park Jefferson International Speedway - Jefferson, SD 305 Sprints - Winged: IMCA RaceSaver Sprints 410 Sprints - Winged, A Modifieds | Results | | Jim Mathieson (A Modifieds) | 7th | - | - | 11th |
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| 9/14/2018 | Park Jefferson International Speedway - Jefferson, SD Opening Night-5th Annual Iron Cup presented by J&J Fitting 305 Sprints - Winged: IMCA RaceSaver Sprints Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Mathieson (A Modifieds) | 7th | - | - | 12th |
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| 9/15/2018 | Park Jefferson International Speedway - Jefferson, SD I State Truck Centers Championship Night-5th Annual Iron Cup presented by J&J Fitting 305 Sprints - Winged: IMCA RaceSaver Sprints Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Mathieson (A Modifieds) | 3rd | - | - | 15th |
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| 10/6/2018 | Murray County Speedway - Slayton, MN 2nd Annual Fall Classic Special Hobby Stocks, Stock Cars, Dirt Mini Trucks, A Modifieds, B Modifieds, Sport Compact | Rain Out |
| 11/7/2018 | Dirt Track at Las Vegas - Las Vegas, NV Duel In The Desert A Modifieds: Duel in the Desert B Modifieds | Results | | Jim Mathieson (A Modifieds) | - | - | - | - |
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| 11/8/2018 | Dirt Track at Las Vegas - Las Vegas, NV A Modifieds: Duel in the Desert B Modifieds | Results | | Jim Mathieson (A Modifieds) | 7th | - | 10th | - |
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| 11/9/2018 | Dirt Track at Las Vegas - Las Vegas, NV A Modifieds: Duel in the Desert B Modifieds | Results | | Jim Mathieson (A Modifieds) | 8th | - | 12th | - |
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| 11/10/2018 | Dirt Track at Las Vegas - Las Vegas, NV A Modifieds: Duel in the Desert B Modifieds | Results | | Jim Mathieson (A Modifieds) | - | - | - | - |
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