The History of Bicycle Day: How One Trip Changed the World

April 19th isn’t just the day before 4/20. It’s a psychedelic holiday in its own right — a day of celebration, history, and, yes, one very famous bicycle ride. This is Bicycle Day: the anniversary of the first intentional LSD trip.

The Chemist Behind the Wheel

In 1938, Swiss chemist Dr. Albert Hofmann was working at Sandoz Laboratories in Basel, researching derivatives of ergot fungus in search of new medicines. On his 25th attempt, he synthesized lysergic acid diethylamide — LSD-25. At first, it was shelved. But Hofmann had a hunch that he’d missed something.

Five years later, on April 16, 1943, he resynthesized the compound — and accidentally absorbed a small amount through his fingertips. What followed was a strange experience of vivid colors, shifting perceptions, and feelings of euphoria. Intrigued, Hofmann decided to take a larger dose three days later — 250 micrograms — to fully understand the effects.

He may have underestimated the potency.

The Ride That Changed Consciousness

On April 19, 1943, Hofmann ingested the LSD and asked his lab assistant to escort him home, as wartime restrictions prevented car use. They made the trip by bicycle — and during that now-legendary ride, Hofmann experienced the world in a way no one ever had before.

He later described intense visual distortions, time dilation, and a profound connection to his surroundings. At moments, he feared he’d gone mad. But by the next day, the fear had faded, replaced by a deep sense of wonder. “There surged up from the earth,” he wrote, “a ground melody of peace and timelessness.”

Thus, Bicycle Day was born — not just the first acid trip, but the birth of modern psychedelic exploration.

Why We Celebrate

Bicycle Day isn’t about glorifying drugs. It’s about honoring a moment of curiosity, courage, and discovery. LSD would go on to influence neuroscience, psychiatry, music, art, and even technology. Its profound effect on consciousness sparked revolutions in how we think, feel, and connect — and opened the doors to therapeutic psychedelic research that continues today.

At Learn Euphoria, we recognize Bicycle Day as a symbol of safe, intentional exploration. It’s a reminder that altered states, when approached with reverence and education, can lead to incredible insight and healing.

How to Celebrate Bicycle Day

You don’t need LSD to honor Bicycle Day. Try one of these instead:

• Take a long, mindful bike ride

• Read LSD: My Problem Child by Albert Hofmann

• Attend a psychedelic education workshop

• Reflect on how perception shapes reality

• Connect with others who are curious about consciousness

A Legacy of Euphoria

Albert Hofmann called LSD “a tool to turn us into what we are supposed to be.” Whether through psychedelics, meditation, art, or connection, Bicycle Day reminds us to keep riding — inward and outward — in pursuit of that deeper self.

So this April 19th, whether you’re microdosing legally, meditating deeply, or just pedaling through the park, take a moment to honor the ride that started it all.