Bullfrog, Rana catesbeiana Bullfrog Rana catesbeiana by Jeff LeClere Status Bullfrogs were listed as a species of Special Concern due to their limited natural range in Minnesota, however, natural populations have shown little fluctuation and there are now introduced populations.
Bullfrogs now have no status in Minnesota.
The bullfrog is Minnesota's largest frog species reaching 8 inches in body length and over a foot long with legs outstretched. The bullfrog's skin color can be anywhere from light green to dark olive to nearly brown. The shade of color may vary in any individual at different temperatures. Typically, darkness or cool weather will cause a frog to lighten up. Some bullfrogs may not have a dorsal pattern, but others may be heavily reticulated with dark brown or black.