- Southern Terminus:
- Boston Post Road (US 1) in Darien
- Northern Terminus:
- Sport Hill Road (CT 59) in Easton
- 20.46 miles
CT 136 begins at Boston Post Road (US 1) in Darien, near the Connecticut Turnpike (I-95). It runs to the east, south of and parallel US 1. In Westport, it turns to the north. It crosses Post Road East (US 1) and continues to the northeast to Sport Hill Road (CT 59) in Easton, where it ends. The entire length is a two-lane undivided road, except for the bridge carrying it over the Norwalk River, which has four lanes.