How long can frog eggs take to hatch?

The time it takes for frog eggs to hatch varies significantly depending on the species and environmental conditions, particularly water temperature.1

For many anuran species (frogs and toads) that deposit their eggs in warm water, development is rapid, often requiring only one or two days to hatch. In contrast, eggs deposited in colder environments, such as mountain lakes or streams, may take 30 to 40 days to hatch.1

While most frogs follow a pattern of aquatic egg deposition, some species have evolved to bypass the free-swimming larval stage entirely through direct development, where the embryos develop within the egg membranes and emerge as tiny froglets. Additionally, some species exhibit parental care, such as the European midwife toad, where the male carries the eggs on land until they are ready to hatch, at which point he moves to a pond to release the larvae.23