A big part of self-sufficiency is being able to provide for oneself all year, not just when the weather's nice. And, with the right planning and preparation, it's entirely possible to harvest all winter in most climates. If you've thought about growing some food in the colder parts of the year, read on for tips and tricks.
Thank you for the comment, and sorry I didn't reply sooner. I imagine your options are limited in Calgary, but if you're interested in extending your season, check out Eliot Coleman's book "Four Season Harvest" - he grows food year-round in Maine.