According to the current Bill regarding Administrative Jurisdiction, the purchase and consumption of alcohol is prohibited in the street and, in general, in other open spaces except those established by the Local Council in question.
Can you drink in parks Spain?
technically, it is not legal (as it is not legal in Paris either, btw). But a policeman could not care less if you are in a park having a civilised picnic with a couple of friends, some food and a couple of beers or wine bottles. I've done many of those picnics and never have had an issue.
When can you drink alcohol in Spain?
In Spain, the legal drinking age is 18 years old. Persons 18 or older are legally permitted to purchase and consume alcoholic beverages. The age to drink alcohol in Spain is consistent across all regions of the country. Even the Basque region is the same, which means the drinking age in Barcelona is also 18.