The first addition to the list was The National Gardening Association's When To Plant Chart. Plug in your info (North America) and up pops a chart with indoor and outdoor planting dates. There are separate printable lists for Spring and Fall. As you can see, I'm using the print out as a worksheet.
A good find! It even covers Northeastern Ontario.
It is! Glad to see it was helpful for your area. They did a nice job of making very easy to use.