It depends on the Province or Territory.
As far as I know in most Provinces East of the Rockies you have to drive with winter tires between certain dates.
In some areas you are allowed studded tires in others you are not.
In British Columbia, which has a very mild climate compared to the rest of Canada - at least in the area where 95% of the population lives, you are allowed to drive with summer tires all year in certain areas, but most (all as far as I have ever experienced) cars get sold with M+S standard. In BC once you go into the Rockies or further north you'll find signs on the highway as of which point it then becomes obligatory between certain dates to carry chains AND/OR drive with M+S tires. You cannot put chains on summer tires (
Passenger Vehicle - Tire and Chain Requirements).
It is not illegal to deliver a car with summer tires as you even have the right in some places where winter tires are obligatory to drive with them for upto 7 days after delivery (not a smart idea though).
Apart from illegal or not, I just hope that Polestar thought this through properly and that contrary to what I'm finding online sofar, I will get a car with 19" M+S. If that isn't the case, then we have a problem... A big problem. CS (Alane) was very clear on the phone, with me, but also with
@boradmc1 (in the US). As a minimum he gave wrong info to
@boradmc1 since
@polerad (also in US) confirms he has 19" standard summer tires.
I'm not panicking yet, but I'm surely getting nervous ! If CS is wrong and the spec is right, then obviously I should have ordered 20" non PP wheels from day 1 as they apparently come with M+S/AS. Explain to me why that makes sense ? Performance wheels with M+S (see spec sheet) but standard wheels with summer tires ? It's just plain wrong.
Just to be clear : M+S or also called AS tires are not winter tires, but you can use them through the entire year in mild climates.
EDIT : BC has some of the most complex regulations around the use of different types of tires :
Designated Winter Tire & Chain Routes.