The race was run at one mile in 1894; it was run at  miles from 1898 until 1988. The race has been run at  miles from 1989 through 2009.
In the past, the event was held over a distance of one mile in 1894, and then expanded to  miles from 1898 to 1988. From 1989 to 2009, it has been run at  miles.