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| 5/1/2021 | Tri-State Speedway - Pocola, OK 42nd Annual Kegger Honoring Cecil Harlan - Features Super Sports, USRA B-Mods, USRA Modifieds, USRA Factory Stocks, USRA Stock Cars | Results | | Robert Knowles (Super Sports) | 4th | - | - | 7th |
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| 7/9/2021 | Outlaw Motor Speedway - Oktaha, OK Champ 360 Sprints - Winged: Oil Capital Racing Series Factory Stocks, Midwest Modifieds, Hornets, Super Stocks, USRA B-Mods, USRA Modifieds | Results | | Robert Knowles (Super Stocks) | 6th | - | - | 4th |
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| 7/10/2021 | Diamond Park Speedway - Murfreesboro, AR Regular Race Night Plus Super Street Stocks! Factory Stocks, Hobby Stocks, Sportsmans, Young Guns, Hornets, Pure Stock, IMCA Modified, IMCA Mod Lite | Results | | Robert Knowles (Hobby Stocks) | 2nd | - | - | 1st |
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| 7/17/2021 | Oklahoma Sports Park - Ada, OK Sooner Sprint Car Series + Regular Racing Program 305 Sprints - Winged, B Modifieds, Street Stocks, Asphalt Sport Mods, Limited Sport Mod, Pure Stock | Results | | Robert Knowles (Street Stocks) | 1st | - | - | 3rd |
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| 7/23/2021 | Outlaw Motor Speedway - Oktaha, OK Full Moon Friday!! All weekly classes Factory Stocks, Midwest Modifieds, Restricted 'A' Class, Winged A-Class, Stock Non-Wing, Hornets, Super Stocks, USRA B-Mods, USRA Modifieds | Results | | Robert Knowles (Super Stocks) | 4th | - | - | 3rd |
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| 8/6/2021 | Outlaw Motor Speedway - Oktaha, OK Weekly Classes Dirt Super Late Models, Factory Stocks, Midwest Modifieds, Hornets, Super Stocks, USRA B-Mods, USRA Modifieds | Results | | Robert Knowles (Super Stocks) | 3rd | - | - | 2nd |
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| 8/14/2021 | Oklahoma Sports Park - Ada, OK Late Models + Regular Racing Program Dirt Super Late Models, B Modifieds, Street Stocks, Asphalt Sport Mods, Limited Sport Mod, Pure Stock | Results | | Robert Knowles (Street Stocks) | 1st | - | - | 11th (DNF) |
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| 9/18/2021 | Oklahoma Sports Park - Ada, OK Regular Racing Program (Last Points Night) B Modifieds, Street Stocks, Asphalt Sport Mods, Limited Sport Mod, Pure Stock | Results | | Robert Knowles (Street Stocks) | 2nd | - | - | 7th |
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| 10/9/2021 | Diamond Park Speedway - Murfreesboro, AR $1K to Win in Pure Stock/Arkansas Factory, Regular Racing in All Other Classes & Super Street Stock Factory Stocks, Hobby Stocks, Sportsmans, Young Guns, Hornets, Pure Stock, IMCA Mod Lite | Results | | Robert Knowles (Hobby Stocks) | 3rd | - | - | 7th |
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| 10/23/2021 | Tri-State Speedway - Pocola, OK 42 Annual Spooker Honoring John Stand - Features Factory Stocks, A Modifieds, Midwest Modifieds, Street Stocks, USRA B-Mods, USRA Modifieds, USRA Factory Stocks, USRA Stock Cars | Results | | Robert Knowles (Street Stocks) | 8th | - | - | 9th |
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