An annual observance on April 20 associated with cannabis culture, originating from high school slang coined by five students in San Rafael, California, in 1971.
Last updated March 18, 2026 · by the
Holiday Calendar Team
The term '420' was coined in 1971 by five students at San Rafael High School in California, who called themselves 'the Waldos' and used it as a code for meeting at 4:20 PM to search for an abandoned cannabis crop. The term spread through the Grateful Dead fan community and was popularized nationally by High Times magazine in the 1990s.
420 began as a private code between five teenagers in 1971 and became one of the most widely recognized cultural references in the world. The number has no connection to a police code, a chemical compound, or a legislative date. It is simply the time that five students at San Rafael High School agreed to meet after sports practice: 4:20 PM, at the statue of Louis Pasteur, with a hand-drawn map to a rumored patch of abandoned cannabis.
They never found the crop, but the code stuck. More than five decades later, April 20 is observed internationally, and legal cannabis is now a $30 billion industry in the United States alone, with recreational use legal in 25 states plus Washington, D.C. The gap between the term's humble origin and its current scale is the story of how counterculture entered the mainstream.
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420 ran on April 20. Here’s who celebrated with offers this year.
The origin of 420 is one of the few cultural origin stories that has been verified and documented. In the fall of 1971, five students at San Rafael High School in Marin County, California, began meeting at 4:20 PM after sports practice. Steve Capper, Dave Reddix, Jeffrey Noel, Larry Schwartz, and Mark Gravitch called themselves "the Waldos" because they hung out near a wall at school. They had obtained a hand-drawn map to an abandoned cannabis crop near the Point Reyes Peninsula, allegedly left behind by a Coast Guard member. Their repeated treasure hunts always started at the statue of Louis Pasteur on school grounds, and the phrase "420 Louis" eventually shortened to just "420."
They never found the crop. But the term stuck as their private code for anything cannabis-related: "420" could mean the substance itself, the act of using it, or a shared understanding that no outsider would decode.
The term's spread beyond San Rafael is directly traceable to the Grateful Dead. One of the Waldos had a brother who worked as a roadie for bassist Phil Lesh, which gave the group regular access to the band's rehearsals and concerts. The Waldos used "420" freely in the band's social orbit, and Deadheads adopted it. Throughout the 1970s and 1980s, the term traveled with the band's touring circuit, remaining largely within the counterculture.
The transition from subculture slang to mainstream awareness happened in 1991, when a flyer promoting a 4:20 PM gathering on April 20 circulated at a Grateful Dead concert in Oakland. High Times magazine picked up the flyer and published the term, giving it national visibility. In 1998, the magazine traced the origin back to the Waldos and published their story, providing the documented evidence that has since been verified by reporters and historians.
While 420 was spreading as cultural shorthand, the legal landscape of cannabis in the United States was beginning to shift. Oregon became the first state to decriminalize cannabis possession in 1973. In 1996, California passed Proposition 215, becoming the first state to legalize medical cannabis. The most significant milestone came in 2012, when voters in Colorado and Washington approved ballot initiatives legalizing recreational cannabis for adults 21 and older.
By 2024, recreational cannabis was legal in 25 states plus Washington, D.C. The industry generated $30.1 billion in legal U.S. sales, and states collected a record $4.4 billion in cannabis tax revenue in a single year. What began as a code word among five teenagers had become associated with one of the fastest-growing legal industries in the country.
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WHY THIS DAY MATTERS
The term '420' is one of the clearest examples of how informal language can drive cultural and political change. A private code coined by teenagers in 1971 became the rallying symbol for a legalization movement that has reshaped drug policy in more than half of U.S. states, demonstrating how shared language builds identity and collective action.
Since the inception of legal adult-use markets, U.S. states have collected nearly $25 billion in cumulative tax revenue from recreational cannabis sales. In 2024 alone, states generated over $4.4 billion, the highest single-year total on record, with revenue funding education, infrastructure, substance abuse prevention, and community reinvestment programs.
Approximately 15,000 dispensaries operate across the United States, providing around 93,000 direct jobs. The total economic impact of the regulated cannabis market was projected to exceed $112 billion in 2024, with every dollar spent at dispensaries generating an estimated $2.50 in additional economic value.
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