Fort Foster (now known as Fort Foster Historic Site) was a fort in central Florida, located 9 miles (5.6 km) south of current-day Zephyrhills in Pasco County. It was built in December 1836 under the direction of Lt. Col. William S. Foster on the site of Fort Alabama. This had been abandoned by federal troops at the end of the Seminole Wars, booby trapped and exploded by gunpowder on the reported approach of Seminole. Fort Foster was reactivated as needed from time to time in 1837, 1841-1842, and 1849 to meet the needs of the military when Seminole activity threatened.