In a normal year, I usually start seeing activity in mid to late April. But in years where there is a lot of snow later on, it may be early May before amphibians start being active. The first breeders here are Pseudacris maculata (Boreal Chorus Frogs), closely followed by Rana sylvatica (Wood Frogs), then Pseudacris crucifer (Spring Peeper), Ambystoma tigrinum (Eastern Tiger Salamander), Ambystoma laterale (Blue-Spotted Salamander), then the Common Toads Copes/Northern Gray Tree Frogs, Northern Leopard Frogs, Green Frogs and Mink Frogs. Mudpuppies are breeding too, but those are a whole different ballgame. There are reports of Notophthalmus viridescens (Eastern Newt) sightings in our area, but I've never personally found one.
We had late snow this year, so it may be a late spring. Can't wait!