Jim Thirkettle at Ontario Motor Speedway
Jim Thirkettle has made 3 NASCAR Cup Series starts at Ontario Motor Speedway since 1975, with 0 wins, 1 top-10 and an average finish of 23.7.
Totals at Ontario Motor Speedway by series
| Series | Starts | Wins | Top 5 | Top 10 | Laps led | Avg finish | Avg start | Best finish |
|---|---|---|---|---|---|---|---|---|
| Cup Series | 3 | 0 | 0 | 1 | 1 | 23.7 | 22.3 | 10 |
Every start at Ontario Motor Speedway
| Date | Race | Series | Start | Finish | Laps led | Status |
|---|---|---|---|---|---|---|
| November 19, 1978 | 1978 Los Angeles Times 500 | Winston Cup Series | 16 | 10 | 1 | Running |
| November 21, 1976 | 1976 Los Angeles Times 500 | Winston Cup Series | 29 | 29 | 0 | Engine |
| November 23, 1975 | 1975 Los Angeles Times 500 | Winston Cup Series | 22 | 32 | 0 | Engine |