Originally, this highway number only applied to Florence-Coolidge Highway; the branch to Casa Grande was added later.

The route proceeds westbound to Coolidge as the Florence-Coolidge Highway.

Upon reaching Coolidge, SR 287 overlaps State Route 87 as Arizona Boulevard, and travels several miles directly south until diverging westward to Casa Grande (where it is known as Florence Boulevard).

[1][2] The route between Florence and Coolidge was numbered as SR 287 in 1932.

[4] In 1961, the section to Casa Grande was added to the designation.