That's great celt. You are one of the fortunate few who live within the range of those little beauties.
If it's possible, you could keep a small kiddie pool (or anything similar) filled with rain water in the spring & summer. Doing so would provide a great place for them to lay their eggs. I know this works because I have rain barrels & the gray treefrogs are always calling from and breeding in them.
Very nice picture by the way!