 VT 129 begins at an intersection with School and Church Streets on Isle La Motte, heading northward as a portion of Main Street. This part of the highway is town maintained and is not signed as a state route. VT 129 then heads north, intersecting with Shrine Road (Town Highway 2) before leaving Isle La Motte over a bridge for Alburgh. The highway turns eastward, intersecting with local roads and passing to the south of Alburg Golf Links. VT 129 then heads to the south, paralleling the shores of the La Motte Passage (a part of Lake Champlain). At a curve to the east, VT 129 intersects with a short extension of a nearby highway, which terminates quickly. The route leaves the connector and heads eastward towards US 2, soon terminating at an intersection with US 2 on the shores of another connector in South Alburgh.
