The Fort Walton culture is the term used by archaeologists for a late prehistoric Native American archaeological culture that flourished in southeastern North America from approximately 1200~1500 CE and is associated with the historic Apalachee people.
The Fort Walton culture was named by archaeologist Gordon Willey for the Fort Walton Mound site near Fort Walton Beach, Florida, based on his work at the site. Through more work in the area archaeologist have now come to believe the Ft. Walton site was actually built and used by people of the contemporaneous Pensacola culture. The peoples of the Ft. Walton culture used mostly sand, grit, grog, or combinations of these materials as tempering agents in their pottery, whereas the Pensacola culture peoples used the more typical Mississippian culture shell tempering for their pottery. Using this unique combination of sand/grit/grog tempering as its criterion Fort Walton culture is now defined within the geographical area stretching from the Aucilla River in the east to a Pensacola–Fort Walton transitional area around Choctawhatchee Bay in the west and north into the interior of south Alabama and Georgia, 107 miles (172 km) up the Apalachicola River and 50 miles (80 km) up the Chattahoochee River.
Approximately 1000 to 1200 CE local Weeden Island peoples began adapting and adopting intensive maize agriculture, the building of platform mounds for ceremonial, political and religious purposes and making a new variety of ceramics, changes likely influenced by contact with the major Mississippian culture centers to the north and west. Early archaeologists thought that the Fort Walton culture represented the intrusion of peoples from Mexico or Mississippian cultures from the northwest replacing the indigenous Weeden Island peoples, but by the late 1970s this theory was generally discounted.