Time in South Dakota Time in South Dakota South Dakota lies in both the Mountain Time Zone and the Central Time Zone. Mountain Time roughly contains the western half of the state, but not all of it. Rapid City is the largest city in the Mountain Time portion of the state. Central Time contains the eastern half of the state and roughly more of the state than the Mountain Time Zone and includes the state capital Pierre and the largest city, Sioux Falls. The 2 zones for South Dakota as given by zone.tab of the IANA time zone database. Columns marked * are from
South Dakota Highway 244 it passes Summit Peak. Near Old Baldy Mountain, the route enters the Mount Rushmore National Monument area. It curves around the park and heads back to the north. The route ends at US 16A south of Keystone. Highway 244 was originally part of South Dakota Highway 87. The switch to Highway 244 occurred in 1977. South Dakota Highway 244 South Dakota Highway 244 (SD 244) is a short state highway located entirely within Pennington County, South Dakota which provides access to Mount Rushmore. Highway 244 runs generally east–west between its eastern terminus at US 16A near Keystone and its western