I'm in zone 5 and use a similar setup. I have the hoops and purchased heavier plastic through Farmtek. I need the heavier plastic because in May we have gale force winds in Chicago. It was pretty similar though and I got about 6 weeks ahead of the standard Memorial Day planting.
Several of my friends who were able to place the little cold frame or greenhouse by a sheltered brick wall that gave it a little heat were a full 8 weeks ahead.
They do work very well.
LoreD
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