Goldenrod and asters will bloom in the fall in the park's open areas. Many wildlife species find the park's varied habitats suitable. Red fox, woodchuck, muskrat, beaver, fox squirrel, raccoon, rabbit and white-tailed deer are common. Recently, river otters were reintroduced in nearby favorable locations. Several otter families have been sighted.
Many birds live in or migrate through the area including robins, warblers, swallows and sparrows.
The yellow-bellied sapsucker and hairy woodpecker are uncommon in other parts of Ohio but abundant in this part of the state. Numerous species of waterfowl and shorebirds take advantage of the park's many wetlands during spring and fall migrations. Canada geese, herons, tundra swans, great egrets and a variety of ducks can be observed. Large predatory birds including several species of hawks and the magnificent bald and golden eagles have been spotted here. History of the Area Mosquito Lake State Park lies in Bazetta and Mecca townships in the center of Trumbull County.