Listeria monocytogenes was isolated from seven leopard frogs (Rana pipiens pipiens), three bullfrogs (Rana catesbeiana), a painted turtle (Chrysemys picta marginata), a leech (Placobdella hollensis) commonly found on turtles, and three species of snails (Physa sayii, Helisoma sp., Oxyloma retusa). Most Listeria isolations were made from leopard frogs collected from pond sites used frequently by deer, shortly after a period of heavy rain.