Everyone will agree that 4/20 is the big annual party for cannabis enthusiasts, especially in Canada. But why April 20?
In 1971, a group of high-school stoners from San Rafael, California, invented what would become the coolest three-digit code ever: 420. At the origin of this golden number of weed culture, five teenagers shared an enthusiasm for weed and a mission: to find an abandoned ganja field in the area. The group of budding researchers nicknamed themselves the Waldos, in reference to their meeting place: a wall outside the school on which the students would rest.
The five lascars (Steve Capper, Dave Reddix, Jeffrey Noel, Mark Gravich and Larry Schwartz ) had chosen a statue of Louis Pasteur installed near the soccer field as their meeting place for smoking joints. As for the meeting time, it was set for 4:20 p.m., due to class schedules and the time needed to reach the smoking spot.
High Times & Grateful Dead
The movement’s posterity was the work of Steven Hager, journalist at High Times, the US periodical bible for weed enthusiasts. The first mention of 4/20 appeared in May 1991. The link with the Waldo group was officially established in 1998.
Steven Hager credits the Dead Heads (hardcore Grateful Dead fans) with releasing the 420 code after Dave Reddix became a roadie for Phil Lesh, the Californian band’s bassist.
At 4.20pm (4.20pm PM), thanks to Dead Heads, it’s time for the common stoner to indulge in the joys of ganja.
Today is an hour, yes, but above all it’s a date: April 20, which sees cannabis consumers from all over the world unite to praise the virtues of this beautiful plant.

Fake check: what 420 is not.
- 420 is not a code used by Uncle Sam’s police to report drug offences.
- 420 does not refer to the number of alkaloids in cannabis (it’s 135.)
- Adolf Hitler was born on April 20, but that’s beside the point.
- 420 is not the New Balance model worn by Waldos.