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The universal code for cannabis culture, originating from a group of California students in the 1970s who met at 4:20pm to smoke.
The number 420 has become the universal code for cannabis culture worldwide. Its origin traces back to 1971 in San Rafael, California, where a group of five high school students called the Waldos would meet at 4:20 PM after school by a statue of Louis Pasteur to search for an abandoned cannabis crop they had learned about.
The Waldos, named for their habit of hanging out by a wall at San Rafael High School, used 420 as a code word to discuss cannabis without alerting parents and teachers. Though they never found the rumored crop, the term stuck. Through connections to the Grateful Dead (the father of one Waldo managed the band's real estate, and another Waldo's brother was friends with Dead bassist Phil Lesh), the term spread through Dead culture and eventually into mainstream consciousness. High Times magazine helped popularize 420 nationally in the 1990s.
April 20th (4/20) is now celebrated globally as a cannabis holiday, with rallies, festivals, and consumption events held worldwide. The number appears everywhere in cannabis culture: product pricing, strain names, dispensary addresses, and more. Legislative milestones are often symbolically timed for 4/20. From its humble origins as a handful of teenagers' code word, 420 has evolved into the single most recognizable symbol of cannabis culture across all languages and borders.
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