Like all of Quebec as well the provinces of Alberta and Manitoba, the legal drinking age in Montreal is age 18. It used to be age 20 until legislation was changed in July 1972. The rest of Canada has the legal drinking age set at age 19.
Does That Mean I Can Frequent Any Bar, Strip Club or Other Alcohol-Serving Establishment in Montreal as Long as I'm 18?
A minority of nightclubs set admission age at 21, but in the vast majority of cases, yes, you can frequent any alcohol-serving establishment (or in the case of restaurants, order any beverage on the menu) in Montreal as long as you're 18 years of age.