As long as you plan to get through the mountain passes in the Rockies before the end of September, you should not have any problems.

There are many opportunities for camping at various provincial & federal (national) parks along the way.

Get yourself a copy of the Ontario Government road map and study it well before you leave - the half-way point of the journey between Toronto and Vancouver is still in Ontario, which means you are going to be spending a lot of time in this province.

Similarly, you might want to familiarize yourself with the policies, prices, etc. of the Ontario Provincial Park system. Here's a link to get you started: Ontario Provincial Parks.

Once you get north of Sault Ste. Marie, don't pass by any gas stations without knowing how far away the next gas station is. There are numerous stretches along the Trans-Canada highway where the gaps between gas stations are 80 kilometers or more. So, pay attention to the map. After you pass Winnipeg, you don't have to be concerned about fuel availability any more.

Be aware that once you settle in BC, you will need to plate the bike there within 30 days. You will have to pass a safety inspection before you can get your BC plate. So, if you determine you need new tires once you get out on the Prairies, might as well buy them early and enjoy them, because you're going to have to have decent tires on the bike to pass the BC safety inspection. The silver lining in that cloud is that BC insurance is (generally speaking) cheaper than Ontario insurance.

Michael