Board Thread:General Discussion/@comment-25926288-20160404010039/@comment-91424-20160405181736

It cannot possibly take place after the first curse. At the beginning, it says "many years ago", and the curse was broken two years ago. It is possible that Oz was frozen, but we do not know for sure why Zelena didn't age 30 years during the curse. It could have been her magic, for all we know. And just because she looks the same age in this episode, does not mean that she hasn't aged since "Kansas". However, since Dorothy has grown into a young woman, the episode takes place at least a few years after "Kansas".