The northern leopard frog is widely distributed in North America, but uncommon and localized in California. Highly aquatic, leopard frogs occur in or near quiet, permanent and semi-permanent water in many habitats. The origins of the state's populations are uncertain, but many appear to be introduced. In the southern part of the state, this species occurs along the Colorado River, and in irrigated portions of Imperial, Tulare and Kern cos.
Adults are opportunistic feeders, taking a variety of aquatic and terrestrial prey.
Tadpoles probably feed primarily by filtering algae and diatoms, but may also consume some plant material and animal food incidentally encountered. At colder localities, adults hibernate on the bottoms of unfrozen bodies of water. Submerged vegetation is apparently unnecessary for hibernation cover. Individuals do not hibernate in southern California, but may become inactive during the coldest periods. Eggs are attached to emergent vegetation.