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Updated: October 26, 2017
Bullfrog. Photo: Lesa Willis
The timing of these events can be influenced by a combination of factors including rainfall, soil, water and air temperature, moisture levels and photoperiod. In central Pennsylvania there are three distinct periods in which potential species can be expected to begin breeding. These periods, and the species that breed in them are as follows:
In most years this period typically begins in mid-March and lasts until mid-April. Depending on the temperatures and precipitation patterns over the winter some species can emerge as early as mid- February and begin calling in early March. Species that chorus during this period include:
In most years this period typically begins in mid-May and lasts through the summer months. Species that chorus during this period include:
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