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Pachysphinx modesta
Found on a picnic table next to a man made lake in a forested area
I have two other species for you as a reference when doing ID research. Manduca quinquemaculata ( five-spotted hawkmoth or tomato hornworm), Sphinx chersis (Great Ash Sphinx or Northern Ash Sphinx) ((I would suggest this one for ID, but they are so similar so I leave this one up to you :) )) and last, but not least Ceratomia undulosa (Waved Sphinx). They are all habitating south Canada.
Best of luck and welcome :)