Northern Red-legged frog

I also agree with Gordon. It does look like a Northern Leopard Frog.

I think it is a northern leopard frog. They exhibit some variability in coloration. We have one variety here that lacks the strong spots and is essentially bronze/green like this one. This species has a strong dorsolateral fold (the ridges that run down the sides of the back), like a leopard frog has. Other frogs have these as well, but take a look at http://www.dfw.state.or.us/conservations... and see if anything else could match.

It doesn't look like a tree frog. It looks more like a leopard frog but I'm not sure what kind terrestrial frog it is.