Board Thread:Legitimate Canon Questions/@comment-5.29.19.231-20150605223135/@comment-4091815-20150606010955

There is no official canonical answer for you. General consensus places it shortly after Episode 2.

There is some disagreement with that assessment because Scott showed a level of control, flashing his eyes at will, that he did not seem to possess until after Magic Bullet.

We know that it happens over just one night at some point during season 1 and prior to Scott's learning that killing the Alpha that bit him might be a cure.