The call of this species is best described as a dry trill.
This species is morphologically identical to Hyla versicolor, but they can be distinguished by call. The call of H. chrysoscelis is faster, "drier" and much less "bird-like" than the call of its sister species Hyla versicolor.
Here is the recording of this individual Hyla chrysoscelis. I have edited out some of the silent periods between calls.
And this is the sonogram for these calls:
The last sonogram examines a single trill of the preceding call.
Each trill lasts approximately 0.5 seconds, although as with most frog calls, the speed of the call is correlated to the ambient temperature.
Here's a short video of a Hyla chrysoscelis calling from a flooded roadside ditch in Medina County, Texas.
Just for a quick comparison, here is the part of a Hyla versicolor call compared to a Hyla chrysoscelis call. Both call segments are 0.25 seconds long. Notice that the the H. chrysocelis call has more peaks in that 0.25 seconds, resulting in a faster trill. In this case, the H. versicolor has 7 peaks (rate of 28 trills per second) and the H. chrysoscelis has 11 (rate of 44 trills per second).
© Chris Harrison 2012