As people in Denver toked up in anticipation of 4/20, police sent out reminders that smoking in public or selling it outside of retail pot shops is still illegal.
On Saturday, about 60 people were cited for violating Colorado's marijuana law, the Denver Police Department said.
Amid the festivities, police asked marijuana users to consume responsibly.
The Denver Post estimated 125,000 people turned out over the weekend for the annual rally in Civic Center Park. Other events also took place around the city.