As millions mark 4/20 on Monday, April 20, the unofficial cannabis holiday has evolved from teenage code to a platform for activists demanding federal decriminalization and expanded access to marijuana across the United States and beyond.
The date April 20 has become shorthand for marijuana culture, with the number 420 serving as a colloquial reference to the plant and the act of consuming it. While 4/20, also known as Weed Day, began as a cultural phenomenon, supporters increasingly use the day to advocate for broader legalization and to highlight the uneven patchwork of state laws that create disparities in access and criminal justice outcomes.
The Waldos and the Birth of a Movement
The most widely accepted origin story traces back to about five decades ago, when five students at San Rafael High School in Marin County, California, would meet after extracurricular activities near a wall at school. The group, eventually called the Waldos because they met by a wall, made their official meeting time 4:20 p.m. and eventually started using 420 as code for smoking.
One of the Waldo members, Dave Reddix, later got work as a roadie for the Grateful Dead, and he told Time Magazine that the band helped to popularize the term. Over the years, theories about the origin of 420 have included police codes, hidden references in classic songs, the number of active chemicals in weed, Bob Marley's birthday, and Bob Dylan's song "Rainy Day Women #12 & 35," but the Waldos' story has been verified by multiple sources.
From Counterculture to Mainstream Advocacy
A key moment came 35 years ago in December 1990, when some Oakland Deadheads distributed a flyer inviting people to smoke on April 20 at 4:20 p.m. A reporter at High Times magazine got hold of the flyer and printed it in 1991, bringing it to the attention of cannabis fans across state lines. High Times continued using 420 in later publications, solidifying its place in pop culture.
Steve Bloom, the High Times reporter who originally received the flyer, later credited the Waldos for originating the term. In a 2013 blog, 13 years ago, he wrote that "they wanted people all over the world to get together on one day each year and collectively smoke pot at the same time. They birthed the idea of a stoner holiday, which April 20 has become."
The Uneven Landscape of Legalization
The legalization of marijuana varies by state, with rules ranging from medical-only use to fully recreational. Currently, at least 24 states and D.C. have legalized recreational use, and several others are weighing changes through legislation or upcoming ballot measures. This state-by-state approach has created significant inequities, with residents in some states facing criminal penalties for activities that are legal just across state lines.
Why This Matters:
The evolution of 4/20 from a teenager's code word to a day of advocacy reflects broader shifts in public attitudes toward cannabis policy and criminal justice reform. The uneven state-by-state legalization creates a two-tier system where geography determines whether someone faces arrest or can legally purchase marijuana, raising fundamental questions about equal protection and federal policy. As activists use 4/20 to call for federal decriminalization, the holiday underscores ongoing debates about drug policy, incarceration rates that have disproportionately affected communities of color, and the role of government regulation in ensuring safe access. With several states weighing changes through legislation or ballot measures, the day serves as an annual reminder of the gap between state-level progress and federal inaction on cannabis reform.