Ive run plenty sativa dominant strains but never 100 % stats. I've started as early as late Feb and had them reveg. Really don't like the reveg much !. Its a hastle!. I'd wait . You could get away with starting them now, or maybe the end of month, but you will have huge plants that will require more care and will get extreamly huge. Huge trees require a lot more maintenance and are subjected to mother nature and all that she has to offer. I have seen sativa dominant strains put out as late as July and get 6 ft with great results. Again , its strain dependent, I would wait ! I will have most mine out June 1 !
This is just my opinion as there will be others that have a different perspective. Good luck !