Tim Williamson NASCAR Cup Series results at Ontario
Back to Tim Williamson career stats
| Year | Race # | Start | Finish | Car # | Sponsor | Engine | Owner | Crew Chief | Qualifying Speed | Laps | X Led | Laps Led | Status | Money | Points |
| 1979 | 31 | 33 | 22 | 10 | Thernasol | Chevrolet | Williamson | 191 | 0 | 0 | running | 2505 | 97 |
