Ronnie Thomas at Ontario Motor Speedway
Ronnie Thomas has made 3 NASCAR Cup Series starts at Ontario Motor Speedway since 1978, with 0 wins, 0 top-10s and an average finish of 31.7.
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 | 0 | 0 | 31.7 | 25.3 | 27 |
Every start at Ontario Motor Speedway
| Date | Race | Series | Start | Finish | Laps led | Status |
|---|---|---|---|---|---|---|
| November 15, 1980 | 1980 Los Angeles Times 500 | Winston Cup Series | 26 | 38 | 0 | Brakes |
| November 18, 1979 | 1979 Los Angeles Times 500 | Winston Cup Series | 18 | 27 | 0 | Engine |
| November 19, 1978 | 1978 Los Angeles Times 500 | Winston Cup Series | 32 | 30 | 0 | Engine |