| | Heat | Dash | B Feature | A Feature |
|---|
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|---|
| 1/8/1998 | Tulsa Expo Raceway - Tulsa, OK 12th Annual Chili Bowl Midgets | Results | | Jason Leffler (Midgets) | 1st | - | - | 1st |
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| 1/10/1998 | Tulsa Expo Raceway - Tulsa, OK 12th Annual Chili Bowl Midgets | Results | | Jason Leffler (Midgets) | - | - | - | 2nd |
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| 2/1/1998 | Phoenix International Raceway - Phoenix, AZ Midgets: USAC National Midgets Silver Crown: USAC Silver Crown Supermodifieds | Results | | Jason Leffler (Midgets) | - | - | - | 16th | | Jason Leffler (Silver Crown) | - | - | - | 4th |
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| 3/14/1998 | Bakersfield Speedway - Bakersfield, CA | Results | | Jason Leffler (Midgets) | - | - | - | 19th |
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| 5/16/1998 | Lucas Oil Raceway at Indianapolis - Clermont, IN Silver Crown: USAC Silver Crown | Results | | Jason Leffler (Silver Crown) | - | - | - | 5th |
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| 5/22/1998 | Indiana State Fairgrounds - Indianapolis, IN Silver Crown: USAC Silver Crown | Results | | Jason Leffler (Silver Crown) | - | - | - | 2nd |
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| 5/24/1998 | Lucas Oil Raceway at Indianapolis - Clermont, IN Midgets: USAC National Midgets | Results | | Jason Leffler (Midgets) | - | - | - | 2nd |
|
| 7/3/1998 | Terre Haute Action Track - Terre Haute, IN Silver Crown: USAC Silver Crown | Results | | Jason Leffler (Silver Crown) | - | - | - | 12th |
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| 7/19/1998 | Angell Park Speedway - Sun Prairie, WI | Results | | Jason Leffler (Midgets) | - | - | - | 8th |
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| 7/24/1998 | Charlotte Motor Speedway - Concord, NC Midgets: USAC National Midgets | Results | | Jason Leffler (Midgets) | - | - | - | 17th |
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| 7/28/1998 | Eagle Raceway - Eagle, NE | Results | | Jason Leffler (Midgets) | - | - | - | 8th |
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| 7/29/1998 | Lucas Oil Raceway at Indianapolis - Clermont, IN Silver Crown: USAC Silver Crown | Results | | Jason Leffler (Silver Crown) | - | - | - | 1st |
|
| 7/30/1998 | Belleville High Banks - Belleville, KS Midgets: USAC National Midgets | Results | | Jason Leffler (Midgets) | - | - | - | 3rd |
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| 8/12/1998 | Lucas Oil Raceway at Indianapolis - Clermont, IN Midgets: USAC National Midgets | Results | | Jason Leffler (Midgets) | - | - | - | 2nd |
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| 8/22/1998 | Illinois State Fairgrounds - Springfield, IL Silver Crown: USAC Silver Crown | Results | | Jason Leffler (Silver Crown) | - | - | - | 12th |
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| 8/30/1998 | Mount Lawn Speedway - New Castle, IN | Results | | Jason Leffler (Midgets) | - | - | - | 2nd |
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| 9/2/1998 | Terre Haute Action Track - Terre Haute, IN Midgets: USAC National Midgets | Results | | Jason Leffler (Midgets) | - | - | - | 20th |
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| 9/5/1998 | Lincoln Park Speedway - Putnamville, IN Midgets: USAC National Midgets | Results | | Jason Leffler (Midgets) | - | - | - | 10th |
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| 9/7/1998 | DuQuoin State Fairgrounds - 1 Mile - DU QUOIN, IL Silver Crown: USAC Silver Crown | Results | | Jason Leffler (Silver Crown) | - | - | - | 14th |
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| 9/19/1998 | Lucas Oil Raceway at Indianapolis - Clermont, IN Midgets: USAC National Midgets 410 Sprints - Non-Winged: USAC National Sprint Cars | Results | | Jason Leffler (Midgets) | - | - | - | 2nd | | Jason Leffler (410 Sprints - Non-Winged) | - | - | - | 4th |
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| 9/26/1998 | Eldora Speedway - Rossburg, OH 410 Sprints - Non-Winged: USAC National Sprint Cars Silver Crown: USAC Silver Crown Midgets | Results | | Jason Leffler (Midgets) | - | - | - | 8th | | Jason Leffler (Silver Crown) | - | - | - | 16th |
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| 9/30/1998 | Bakersfield Speedway - Bakersfield, CA | Results | | Jason Leffler (Midgets) | - | - | - | 7th |
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| 10/3/1998 | Kings Speedway - Hanford, CA Midgets: USAC Western States Midgets 360 Sprints - Winged | Results | | Jason Leffler (Midgets) | - | - | - | 2nd |
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| 10/10/1998 | Bakersfield Speedway - Bakersfield, CA | Results | | Jason Leffler (Midgets) | - | - | - | 1st |
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| 10/10/1998 | Cal-Expo State Fairgrounds - Sacramento, CA Silver Crown: USAC Silver Crown 410 Sprints - Winged | Results | | Jason Leffler (Silver Crown) | - | - | - | 8th |
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| 11/21/1998 | Manzanita Speedway - Phoenix, AZ Midgets: USAC National Midgets | Results | | Jason Leffler (Midgets) | - | - | - | 1st |
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