Every April 20, cannabis operators see a sales spike, retailers run promotions, and headlines reference “420.” But where did the term actually come from?

The most credible origin story traces to a group of high school students in San Rafael, California in the early 1970s — a group nicknamed “the Waldos” for the wall they'd hang out by. The story goes: the Waldos heard about an abandoned cannabis crop hidden somewhere near the coast, and they'd meet at 4:20 p.m. each day at a statue of Louis Pasteur to begin their search. They never found the crop. But the time — 4:20 — stuck.

From there, the term spread through the Grateful Dead community (where one of the Waldos had connections) and into the broader cannabis culture of the 1980s and 1990s. By the time states began legalizing in the 2010s, “4/20” was an established cultural shorthand.

Why it matters for cannabis operators

Beyond the cultural significance, 4/20 has become a major commercial moment for the cannabis industry. Operators typically see:

  • Sales volume 30–60% higher than a typical day
  • Increased foot traffic at dispensaries
  • Heavy promotional discounting and event marketing
  • Higher inventory turnover, requiring extra staff and security

From an insurance perspective, 4/20 is also a higher-exposure day:

  • More cash on premises means crime exposure spikes
  • Foot traffic means slip-and-fall and general liability claims rise
  • Promotional events that include consumption (where legal) increase products liability exposure
  • Special-event endorsements may be required for any off-site activations

What to do before next 4/20

Operators planning meaningful 4/20 promotions should review with their broker:

  • Whether crime / cash limits accommodate higher-than-usual on-premises holdings
  • Whether special-event coverage is needed for any off-site activations
  • Whether products liability limits cover the expected sales volume spike

One day's revenue increase isn't worth one day's coverage gap.

All coverage is subject to underwriting. No coverage is bound or altered until confirmed by an authorized Spire representative.