I'm thinking of growing outdoors in Toronto, Ontario next year and I was thinking of growing a plant called "purple power". The description says it's fine to grow in cold wet climates (even though it's a sativa), but my question is when should I plant it? What month?

I would start the grow around late march early april indors. once the beauty/ies are healthy and it is worm enough (after last frost), transplant to out side.

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Spreading Happiness One Bud at a Time

Well, if the only issue is worrying about frost than it shouldn't matter. There usually isn't frost after march.

yea, last years crop i vegged my plants from jan-march , put them outside on the second week of march, and they all did fine, some of the smaller plants got a little cold, and looked ill, but they all managed fine.. And by the way i am getting purple power, early misty, and super skunk for next years crop, ill tell you all how it goes next october/November :P