| Opened | August 1, 1925 |
| Last Race Date | Still in Operation |
| Racing Type | Thoroughbred |
| Abbreviation | Tdn |
| Purse Value Index | 9 |
| Signature Race | Ohio Derby (GIII) |
- 08/01/1925 Roiville is the first horse to cross the finish line.
- 10/28/1944 Both the clubhouse and grandstand were destroyed by fire.
- 00/00/1960 Cranwood dates are transferred to Thistledown.
- 00/00/1968 Randall Park dates are transferred to Thistledown.
- 05/30/1968 Inner turf course opens for racing.
- 00/00/1969 Ascot Park dates are transferred to Thistledown.
- 00/00/1974 Inner turf course is pulled up.
- 11/26/1975 All weather inner dirt course is used for first time.
- 06/18/1978 19,411 fans set all time attendance record.
- 08/22/1990 A racing rarity as both ends of the double end in dead heats.
- 03/20/1993 The Ohio 7/7 is unveiled, two Ohio tracks running seven races as same card.
- 05/05/2007 A Kentucky Derby day crowd bets $1,943,862 to set track record.
- 04/09/2013 Thistledown, is first thoroughbred racino, second overall to open in Ohio.