This is one of the first frogs calling in the spring, along with the Spring Peeper Spring Peeper (Pseudacris crucifer) and Western Chorus frog (Pseudacris triseriata). All three along with the Gray Treefrog (Hyla versicolor), posses the ability to survive a partial freezing which is what makes them mother natures natural choice to be out first. The Grey Treefrog doesn’t call until later in the spring.