| Opened | August 15, 1946 |
| Last Race Date | Still in Operation |
| Racing Type | Standardbred |
| Abbreviation | Har |
| Speed Rating | 2:00.3 |
| Signature Race | Bobby Quillen Memorial |
- 08/15/1946 Opens for racing as Kent & Sussex Raceway.
- 09/29/1974 4,077 fans turn out to set record attendance figure.
- 00/00/1996 Video Slot Gaming debuts at Harrington Raceway.
- 04/01/2003 Season opens with upgraded, wider half mile oval
- 00/00/2006 The slot parlor doubles in size at Harrington Raceway.
- 05/16/2006 Local favorite Hal Belote dies from injuries during a race.
- 10/02/2006 The amount of $1,112,036 was bet to establish a new handle record.
- 00/00/2010 Table games are added to the slot parlor.