And for those who partake in cannabis culture, Hippie Hill in San Francisco's Golden Gate Park is typically ground zero for celebration.
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RELATED: Organizers, officials explain why SF's popular 420 Hippie Hill event is canceled this year
But because of the city's budget restraints and a lack of sponsors, the festival was scrapped this year.
Instead, the San Francisco Recreation and Parks Department held a field day with volleyball and kickball games.
The festival may have been canceled but that didn't stop the cannabis crowd from coming out later.
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There was a lot of smoke in the air for an informal gathering celebrating 420.