Alberta It's the law and it is best not to fiddle with it; there was some unhappy campers in the Eastern Townships yesterday when they had some snow over there (not to say anything about Eastern US and Atlantic Canada).. For our visitors, if you are coming by car you … Quebec is perhaps one of the strictest provinces when it comes to winter tires. Time Frames Most provinces restrict studded tire usage to the winter months because they can make ruts and even dislodge chunks of pavement from the road surface. Did You Know? Regulations limit the number of studs to fewer than 130 per tire on vehicles weighing less than 4,600 kg. In 2007 a law was passed that required all motorists to have four winter tires fitted to their vehicle.

Laws concerning the use of studded tires are provincially regulated in Canada; residents and visitors alike must conform to these regulations. Just to remind everybody that all vehicles with a Québec license plate will need winter tires starting November 15. Signs are posted on all roads where this is a requirement. The tires must have at least 3.5mm of tread depth. ... citizens upset with new city rental law… Winter tires or all-season tires with the “M+S” symbol (mud and snow) are required on many BC roads between October 1 and March 31. In Quebec, Winter Tire Law Reaps a Modest Measure of Success - The New York Times The number of road deaths in the only province which makes winter tires mandatory has halved since the early 2000s, however road deaths have also been decreasing even in provinces without such a law
Winter tires must also be marked with a snowflake and mountain on the tire wall.

Visitors to Quebec are not required to have snow tires.

A Quebec law enacted in 2008 that mandates snow tires on passenger vehicles over the winter months has been credited for a reduction in serious car accidents. Winter tires must be used in Quebec between December the 15th and March the 15th. In these areas, motorists must use Winter tires or carry tire chains. Snow tires are only required by law in certain mountainous regions. Studded snow tires with studs up to 3.5 mm in length are permitted between October 1 and April 30.