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| 1/1/2015 | Tulsa Expo Raceway - Tulsa, OK Racing - Night 2 Midgets, Economy Midgets, Winged Outlaw, Non-Wing Outlaw, Restricted 'A' Class, Winged A-Class, Stock Non-Wing, Junior Sprints, 1200cc Outlaws Non-Winged Minis, Lightning Sprints | Results | | Colby Thornhill (Restricted 'A' Class) | 7th | - | - | - |
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| 1/2/2015 | Tulsa Expo Raceway - Tulsa, OK Racing - Night 3 Midgets, Economy Midgets, Winged Outlaw, Non-Wing Outlaw, Restricted 'A' Class, Winged A-Class, Stock Non-Wing, Junior Sprints, 1200cc Outlaws Non-Winged Minis, Lightning Sprints | Results | | Colby Thornhill (Restricted 'A' Class) | - | - | - | - |
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| 1/3/2015 | Tulsa Expo Raceway - Tulsa, OK Racing - Night 4 Midgets, Economy Midgets, Winged Outlaw, Non-Wing Outlaw, Restricted 'A' Class, Winged A-Class, Stock Non-Wing, Junior Sprints, 1200cc Outlaws Non-Winged Minis, Lightning Sprints | Results | | Colby Thornhill (Restricted 'A' Class) | - | 13th | 3rd | - |
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| 5/1/2015 | Willamette Speedway - Lebanon, OR Kage Kart Race #2 Winged A-Class, Junior Class, Adult Open, Adult Medium, Rookie Class, Junior 1 Animal Dirt Karts, Yamaha Open, Dirt Cage Karts Open, Flat Adult Clone, 125 Yamaha, 250 yamaha | Results | | Colby Thornhill (125 Yamaha) | - | - | - | 2nd |
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| 5/2/2015 | Sunset Speedway Park - Banks, OR DIRTcar Factory Stock, A Modifieds, Restricted 'A' Class, Winged A-Class, Street Stocks, Hornets | Results | | Colby Thornhill (Restricted 'A' Class) | 7th | - | - | 3rd |
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| 5/23/2015 | Sunset Speedway Park - Banks, OR 98.7 THE BULL PRESENTS SPRING CHALLENGE Dirt Late Models: NW Extreme Late Models A Modifieds, Restricted 'A' Class, Winged A-Class, Street Stocks, Hornets | Results | | Colby Thornhill (Restricted 'A' Class) | 3rd | 1st | - | 4th |
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| 5/24/2015 | Sunset Speedway Park - Banks, OR SPRING CHALLENGE A Modifieds, Restricted 'A' Class, Winged A-Class, Street Stocks, Dirt Late Models, Hornets | Results | | Colby Thornhill (Restricted 'A' Class) | 1st | 2nd | - | 1st |
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| 6/5/2015 | Willamette Speedway - Lebanon, OR Kage Kart Race #4 Winged A-Class, Junior Class, Adult Open, Adult Medium, Rookie Class, Junior 1 Animal Dirt Karts, Yamaha Open, Dirt Cage Karts Open, Flat Adult Clone, 125 Yamaha, 250 yamaha | Results | | Colby Thornhill (Dirt Cage Karts Open) | - | - | - | 8th | | Colby Thornhill (250 yamaha) | - | - | - | 1st |
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| 6/13/2015 | Sunset Speedway Park - Banks, OR 98.7 THE BULL PRESENTS NW DWARFS VS. PHRA DWARFS NATIONALS Restricted 'A' Class, Winged A-Class, Street Stocks, Dwarf, Hornets | Results | | Colby Thornhill (Restricted 'A' Class) | 1st | 4th | - | 5th |
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| 8/8/2015 | Sunset Speedway Park - Banks, OR 98.7 THE BULL PRESENTS THE 2ND ANNUAL DRIVERS APPRECIATION NIGHT (MAINS ONLY) DIRTcar Factory Stock, A Modifieds, Restricted 'A' Class, Winged A-Class, B Modifieds, Street Stocks, Dirt Late Models, Dwarf, Hornets | Results | | Colby Thornhill (Restricted 'A' Class) | - | - | - | 3rd |
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| 12/28/2015 | Tulsa Expo Raceway - Tulsa, OK Early Move-In Economy Midgets, Winged Outlaw, Non-Wing Outlaw, Restricted 'A' Class, Winged A-Class, Stock Non-Wing, Junior Sprints, 1200cc Outlaws Non-Winged Minis, 1200cc Outlaws Winged Minis | Results | | Colby Thornhill (Restricted 'A' Class) | - | - | - | - |
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| 12/29/2015 | Tulsa Expo Raceway - Tulsa, OK Move-In / Registation Economy Midgets, Winged Outlaw, Non-Wing Outlaw, Restricted 'A' Class, Winged A-Class, Stock Non-Wing, Junior Sprints, 1200cc Outlaws Non-Winged Minis, 1200cc Outlaws Winged Minis | Results | | Colby Thornhill (Restricted 'A' Class) | - | - | - | - |
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| 12/31/2015 | Tulsa Expo Raceway - Tulsa, OK Racing Economy Midgets, Winged Outlaw, Non-Wing Outlaw, Restricted 'A' Class, Winged A-Class, Stock Non-Wing, Junior Sprints, 1200cc Outlaws Non-Winged Minis, 1200cc Outlaws Winged Minis | Results | | Colby Thornhill (Restricted 'A' Class) | 3rd | - | - | - |
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