yeah i live in the bay area and i planted 3 clones mid march in pots in my backyard. they are about 2 feet tall now and are 2 of them actually started flowering because of the long nights ( brought them inside to re veg under some cfls till the days get a bit longer ) but yeah my 3rd plant isnt minding the nights and is showing no signs of flowering and is boosting hard. Im about to plant some more clones in a few days. so to answer your question, yes you can start now, this is a very good time to plant up here for some biiiig results. good luck mate