| Kentucky Derby | |
| Grade I stakes race | |
| Location | Churchill Downs |
|---|---|
| Date | May 21, 1878 |
| Winning horse | Day Star |
| Jockey | Jimmy Carter |
| Trainer | Lee Paul |
| Owner | Thomas J. Nichols |
| Surface | Dirt |
The 1878 Kentucky Derby was the 4th running of the Kentucky Derby. The race took place on May 21, 1878.[1] Winning horse Day Star set a new Kentucky Derby record with a winning time of 2:37.25.[2]