Grant's Trail is a biking and walking trail in St. Louis County, Missouri that begins at Orlando Gardens near Union Ave and I-55 and runs northwest to Holmes Ave and I-44 in Kirkwood. The trail is 8.25mi and is part of the Gravois Greenway. It connects the Meramec River Greenway to the River des Peres Greenway.LocationKirkwood trailhead: St. Louis trailhead: