Route 187 is a secondary state route in the U.S. states of Connecticut and Massachusetts. It begins in the city of Hartford at Albany Avenue (US 44), travels north through the towns of Bloomfield, Windsor, East Granby and Suffield until the Connecticut-Massachusetts state line. Route 187 continues north across the state line through Agawam into Westfield, where the route ends at US 20 east of Westfield center.