We usually set out on some camping days in November on the coast. There are no bugs
and the 3 season trailers are comfortable enough during this time with heaters. If not on the coast, I would think that things would start to freeze up.
We are in a bubble here and usually only have a few weeks of weather below zero. Mostly rain in our winter. I expect that same goes for PEI and the Maritimes.
In the prairies, they got some snow recently! so that is quite unpredictable.