Commercial Halloween starts during October just after or parallel with October-fest. It ends before end of October because people buy things for an event before it starts. End of Halloween is when Commercial Christmas starts.
There is no time for actual advent or winter calmness in general.
Wouldn't winter calmness be January or February, maybe March? You know coldest time in general on Northern Hemisphere?
I think you are right, that seems to be the case.
I decided to indulge in a Dunkin' pumpkin donut this morning, what with it being late October and the weather actually now fall-like. Apparently they have already discontinued them!