State Road 636 (SR 636) is a 6.969-mile-long (11.216 km) state highway in Hardee County, Florida, that runs from U.S. Route 17 (US 17) and County Road 64A in Wauchula to SR 64 east of Wauchula.

State Road 636 begins at Sixth Avenue which is southbound US Route 17 (SR 35) and serves as the dividing line between north and south Avenues.

One block later the road crosses South Fifth Avenue/North George Burris Avenue, and immediately after passing the former Atlantic Coast Line Railroad Depot on the northeast corner of that intersection has another intersection with northbound US 17/SR 35.

The route still carries East Main Street as the street name even after crossing a bridge over the Peace River, as well as a slightly shorter bridge above an overflow creek.

The rest of the route travels in a straight west to east line in a largely rural setting, though the number of paved intersection outnumber unpaved ones.