The best way I have found grays is you can set up a baby pool and fill with water. Install some rocks and branches for easy in/out access. Then wait till night time when they call. They will usually be in the pool looking for a mate. You will also find other frogs will come to the water pool to breed. You can catch them then or wait for the eggs or tadpoles. I just caught a new gray about 2+ weeks ago and all the frogs were out calling. The past week or so I have heard no frog calls due the cold spell we are having. I have never found a spring peeper but hear them everywhere. I am still looking to find some. Does any one have any good trap tricks for peepers?