A little info on the Fall in BC:
I can’t speak for Alberta, however usually when BC sneezes, Alberta wipes it’s nose when it comes to weather in the fall and winter, and 99 times out of 100 it’s worse in Alberta.
Now the weather and snow can happen anywhere in BC and western Canada any month of the year, and usually doesn’t stick to the roads longer that 24hrs until later in the fall... usually....
But, there have been occasional snow storms in August and September, for those you can “usually “ just stay putt for a day or two at the most and it will clear up.
However.....
BC has some pretty strict winter tire requirements that start October 1st
Winter tire requirements in BCNow, if the roads are dry and the sun is shining there won’t be a road side check for tires.
However, I live 3 hrs north of Spokane Washington and only 30 minutes from the Highest mountain pass open year round in Canada and 10 minutes from #5 & #7 of the highest passes in BC open year round, and if the weather does take a turn for the worst and that weather person says there is a heavy snow fall warning, the RCMP and or DOT will put up road blocks and check the tires on vehicles before they will allow them to pass. Most people around here have the correct tires on by Oct 1st but a few don’t. Those are usually the people that will get turned around, and sometimes get a fine. Truck drivers that don’t have their chains hanging / with them will get a fine at those roadside checks.
So know the rules, if it snows hangout and read a book until thing clear up and carry on.
I don’t winterized my camper until mid October when I park it for the season. If it gets super cold, run all the water for a bit, turn on the Fce in your rig for a bit and our heat up the hot water tank before you travel.
We came back from Nevada a few years back on Dec 1st and we had snow and freezing temps from just outside of Ely Nv. all they way home to BC. I didn’t have a problem with anything freezing after using those tricks above.
Also think about heading straight south on Hwy 97 from Prince George into Washington state at Osoyoos and then join up with I-90, there are no mountain passes South of PG on Hwy 97.
So head north to Alaska on the Alaska Hwy and then south on Hwy 37 ( The Cassiar) to join up with Hwy 16 east to PG where you join up with Hwy 97 south all the way.
Weather is always a good thing to check anytime you travel especially in the fall and winter in northern BC.
Have Fun.
Soup.