Another problem with Canada in early summer is the season of the black flies, which starts around Mother's Day and ends around Father's Day. The male black fly drinks nectar but the female craves blood and has been known to kill cattle. The bites may cause severe allergic reactions and cause a disease known as "river blindness".
So maybe we'll ease into Canada about the third week in June after the black flies die off. We can hit the coast of Maine for a few weeks and eat lobsters while we wait.