FM 1187 was designated on July 14, 1949 from
US 81 east to Rendon. On May 23, 1951, FM 1187 was extended east to US 287 (now Business US 287). On October 29, 1953, FM 1187 was extended west to a county road. On October 25, 1954, the section of FM 1187 west of
FM 731 was transferred to FM 731. On November 22, 1955, FM 1187 was extended west to
FM 1902, replacing the section of FM 731 from FM 1187 to FM 1902. On November 24, 1959, FM 1187 was extended northwest to US 377. On December 20, 1984,
FM 2376 from US 377 to
FM 5 and the section of FM 5 from what was FM 2376 to
US 80 were transferred to FM 1187. The designation of this segment reverted to FM 1187 with the elimination of the Urban Road system on November 15, 2018. ==Major intersections==