Dwain Northey (Gen X)

The story of “420” isn’t some ancient code handed down by shadowy botanists—it’s a far more ordinary tale that accidentally grew into legend.
It starts in the early 1970s in San Rafael High School, where a group of students nicknamed themselves the Waldos. Their mission wasn’t philosophical or political—they were trying to find a rumored abandoned cannabis crop somewhere in the hills of Marin County. They agreed to meet after school at 4:20 p.m., using “420” as a shorthand for both the time and their little treasure hunt. Spoiler: they never found the crop, but the code stuck.
From there, things get more interesting. The Waldos had connections to the orbit of the Grateful Dead, whose fans—the famously nomadic Deadheads—were excellent at spreading ideas, trends, and, apparently, time-based slang. “420” began circulating beyond a single high school, morphing from “meet at this time” into “let’s smoke.”
By the 1990s, the term got a major boost when High Times published and popularized it, effectively canonizing “420” as cannabis shorthand. Once media picked it up, the number escaped its humble origins and became cultural currency.
Then came April 20—4/20—which evolved into an unofficial holiday for cannabis enthusiasts. Gatherings, protests, and celebrations began popping up in places like Golden Gate Park and beyond, blending counterculture, advocacy, and a fair amount of smoke.
As for why this number stuck when so many other codes didn’t—it’s partly timing, partly luck, and partly because it sounds just cryptic enough to feel like you’re in on something. Over time, “420” shed its inside-joke origins and became a global symbol for cannabis culture, even as laws and attitudes toward marijuana shifted dramatically.
So what began as a bunch of teenagers looking for a mythical stash turned into one of the most recognizable pieces of modern slang. Not exactly sacred history—but in its own hazy way, a cultural myth with surprisingly well-documented roots.









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