Talk:Breeding/@comment-153.107.97.151-20120217010517/@comment-4610180-20120217060758

This one.

'"unfortunately the seasonal dragons are exactly that - seasonal!"

And this tweet about Reindeer.

"Only 2 Reindeer Dragons will hatch another Reindeer Dragon. Unless you are breeding during the xmas holidays!"

I believe that is pretty much direct confirmation that seasonal dragons can only be bred during their season (ie Bone during Halloween).