Best 420 events in the US for 2027
April 20 is the biggest day on the cannabis calendar. In 2027, 4/20 falls on a Tuesday, so many cities will spread events across the weekend before and after. This guide covers the best 420 events in the US for 2027, from long running rallies to big city festivals, with honest notes on what has been confirmed. As of October 29, 2026, most organizers had not announced 2027 dates, so we focus on each event’s usual timing and how to check for updates. Spring is also planting season for many outdoor growers, which is why our 420 seeds collection is popular this time of year. Kind Seed Co sells only to adults 21 and older.
Where 420 comes from
The most widely reported story traces 420 to a group of students at San Rafael High School in California in 1971. Known as the Waldos, they reportedly met at 4:20 in the afternoon. The term spread through Grateful Dead fan circles and later through magazines, and April 20 became an informal holiday for cannabis culture. Today, 420 is used for rallies, festivals, product launches and community events across the country.
2027 at a glance
| Event | City | Usual timing | 2027 status (Oct 29, 2026) |
|---|---|---|---|
| Hash Bash | Ann Arbor, MI | Traditionally first Saturday in April | Not confirmed |
| Mile High 420 Festival | Denver, CO | On or near April 20 | Not announced |
| National Cannabis Festival | Washington, DC | Spring | Not announced |
| 420 on Hippie Hill | San Francisco, CA | April 20 | Not announced |
Hash Bash, Ann Arbor
Hash Bash kicks off the 420 season. Held on the University of Michigan Diag since the early 1970s, it mixes speeches, activism and a lively street fair on nearby Monroe Street. It is traditionally held on the first Saturday in April, which would be April 3, 2027. The organizers had not confirmed this when we checked. It is a good choice for people who want history with their 420.
Mile High 420 Festival, Denver
Denver’s Mile High 420 Festival has drawn large crowds to Civic Center Park in past years and has often been free to attend. Some editions have been changed or not held because of park work and other issues. As of October 29, 2026, the organizer had not announced 2027 plans. Watch the official festival site and Denver city announcements.
National Cannabis Festival, Washington, DC
The National Cannabis Festival mixes music, education and advocacy, often including a policy summit. It is usually held in spring, sometimes close to 4/20. The official site had not posted 2027 dates when we checked, and we do not repeat unconfirmed dates from third party listings.
420 on Hippie Hill, San Francisco
San Francisco’s 420 gathering on Hippie Hill in Golden Gate Park has been a famous informal celebration for decades and has grown into an organized event in some years. Its status has varied. Check city and organizer updates in early 2027.
Other ways to celebrate in 2027
Not every 420 needs a festival.
- Local dispensary events. In legal states, many licensed retailers host 420 events and deals. Follow state rules on age and consumption.
- Cannabis friendly venues. Some cities allow licensed consumption lounges. Check local law before you go.
- Advocacy days. Many groups use April to meet lawmakers or run voter registration drives.
- Community cleanups. Some organizations host park cleanups on or near 4/20.
- A home gathering. A small get together with friends who are 21 and older, with good food and a safe plan for getting home, is a classic option.
Planning a 420 trip in 2027
Because 4/20 falls on a Tuesday in 2027, travel plans need a little more thought.
- Wait for confirmation. Do not book flights or nonrefundable hotels until the organizer posts the date and venue.
- Book flexible stays. Choose refundable rates in case an event moves to the weekend.
- Check hotel rules. Most hotels ban smoking in rooms, and many charge cleaning fees.
- Learn state law. Possession limits, consumption rules and the legal age are set by each state.
- Leave cannabis at home. Carrying cannabis across state lines or through airports can break federal law.
Hosting a 420 gathering at home
If you would rather stay in, a small gathering can be just as fun. Invite only adults 21 and older, plan good food and nonalcoholic drinks, and set up a comfortable outdoor space if your home and local rules allow it. Make sure every guest has a safe way home. Keep products stored and locked away from kids and pets before and after the party. A playlist and a few board games can round out the day.
Start a spring grow around 420
April 20 lands in the middle of spring planting season across much of the US. Where home growing is legal, it is a natural time to start seeds for an outdoor season or a new indoor run. Autoflowers are a popular choice because they finish on their own schedule. Our 420 seeds collection, autoflower seeds and outdoor seeds are good places to look. New growers can read our guide on how to germinate cannabis seeds and our ultimate beginners guide to growing cannabis.
420 safety tips
- Bring a valid ID showing you are 21 or older
- Public consumption is illegal in many places, even in legal states
- Never drive after consuming, and plan your ride home in advance
- Stay hydrated and eat a real meal
- Do not carry cannabis across state lines or onto federal land
- Keep products locked away from children and pets at home
How to find events near you
Many of the best 420 events are local and small. Check your city’s events calendar, local news and the social accounts of advocacy groups in your state. State NORML chapters often list rallies and educational events. Licensed retailers usually post 420 plans a few weeks ahead. Always confirm details with the organizer.
Frequently asked questions
What day of the week is 4/20 in 2027?
April 20, 2027 is a Tuesday. Many events may shift to the weekend before or after.
What is the biggest 420 event in the US?
Denver’s Mile High 420 Festival and San Francisco’s Hippie Hill gathering have historically drawn some of the largest crowds, but neither had announced 2027 plans as of October 29, 2026.
When is Hash Bash 2027?
Hash Bash is traditionally held on the first Saturday in April, which would be April 3, 2027. Confirm with the organizers before you travel.
Why is April 20 associated with cannabis?
The most widely reported story traces the term 420 to a group of California high school students in 1971 who met at 4:20 in the afternoon.
Is 420 a good time to plant seeds?
In much of the US, April is spring planting season. Check your local climate and only grow where it is legal for adults 21 and older.
The bottom line
The best 420 events in the US for 2027 are still waiting on official dates, so use this guide to plan and confirm everything with organizers in early 2027. Wherever you celebrate, stay legal and safe. Spring growers can browse our 420 seeds or the Kind Seed Co shop. Kind Seed Co sells only to adults 21 and older. Always follow the home grow laws where you live.
