Wood frog freeze tolerance, with limits

That 65–70% measures the water in a wood frog’s body, not the percentage of its whole body that freezes.

In freeze-tolerant wood frogs, ice forms mainly outside the cells.

Experimentally frozen winter frogs from an Interior Alaska subarctic population survived to −16 °C.

Freeze tolerance varied within that Interior Alaska population: spring frogs had a reported lower limit between −2.5 and −5 °C.