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.
Tadpoles use shallow water near shores.
Water at breeding sites must persist long enough to permit the completion of larval development. This species occurs near permanent or semi-permanent water in many habitat types. Terrestrial individuals may be active at all times of the day. In areas with mild winters, leopard frogs are active all year, but in cooler climates they undergo periods of inactivity or hibernation. They may represent lengthy foraging excursions, or dispersal to breeding localities.