Although the taste of milk is really dependent on your pallet, one difference could be credited to the difference in food the cows eat. Because of the different climates, each region grows different feed for the cows. For example, corn is large crop grown throughout a lot of Ontario, but Alberta’s climate is better suited for wheat or barley. Whatever is locally grown is then fed to the cows which may impact the flavour of the milk. You can learn more about cow’s diets in Brandon’s question.
There are a variety of ways milk is processed and packaged and it may also slightly influence the taste. For example, Alberta doesn’t use plastic bags to package our milk, but Ontario does. Perhaps you could try another brand or packaging and you may enjoy the taste better.
It’s important to note that all milk from coast to coast must follow the same strict safety standards set by the
Canadian Quality Milk program and the Canadian Food Inspection Agency.