So, we can never grow tomatoes in Canada unless we have a greenhouse. I'm using an old Quebec garage from Costco, and putting 6 mil plastic from ammie on top.
Then it is raised on the main poles and I hope it can withstand the winds. The heavier stuff is twice as expensive. Everybody needs a greenhouse for the next 20 years, or 300 years, whatever.
ps. so miserable to handle with plastic with just a puff of wind. Now I'm stitching on the roof with grommets and cable ties.
All done with the standard white sides and I put in the tomatoes in their containers. So dang hot in their, I'm leaving the front with loose clear plastic.