In 2003 I bought my first copy of Margeret Bennet-Alder's 'The Toronto Gardener's Journal and Source Book'. It is an informative publication and in particular I found the charts in the inside covers very useful.
The inside front cover has a weekly count down to the usual last frost for Toronto, which at this time is eleven weeks away on April 20th.
This may astound many local gardeners who stick to the old-school idea that the gardening season starts on May 21st. This is ridiculous, of course, as most of the Spring flowers have finished by then, no more Narcissus, Galanthus or early Tulips and the Hellebores are past their best.