We can grow lots of food around here, even without using a greenhouse to make it all grow, BUT, we cannot grow things like citrius fruits (too cold most of the time), cannot grow bananas and similar tropical fruits.
We do have a great growing season, but, it isn't "year round" like you have in the southern states. Many from the deep-south talk about growing "winter" produce - those would be our summer foods.
Pumpkin, squash, tomatoes, carrots, peas, lettuce, etc all grow very nicely around here, and, some areas of Canada grow nicer than other areas based on ground-soil and "normal" weather patterns. Wildmist used to live 4hrs drive further north of where we are now and she had amazing gardens producing abundant harvests.
If you want to learn more about the kinds of gardening, search on some of "northern" cities in Canada and compare with with some of the "southern" cities in Canada. You will find most of the growth in "southern" parts of Canada are very similar to the growth in "northern" USA.
My weather patterns here in Calgary and that of Montana, Idaho, Washington are exactly the same, the average temperatures are very similar and the land itself is very similar. The weather doesn't care about borders. :flower:
You can drive from Spokane, WA to Kelowna, BC and see the exact same soil-type and plants growing.