Poson Poya: How Buddhism Came to Sri Lanka
Updated June 20, 2026
If Vesak is the festival of the Buddha himself, Poson is the festival of how his teaching reached Sri Lanka. Falling on the full-moon Poya of June, the month after Vesak, Poson commemorates the introduction of Buddhism to the island — an event that reshaped Sri Lankan civilisation and is still felt in its culture, art and daily life today.
Poson is celebrated across the country, but its heart is the ancient city of Anuradhapura and the nearby rock temple of Mihintale, where the pivotal meeting is said to have taken place. This guide tells the story behind Poson, explains how it is observed, and describes the dansals and displays that accompany it.
The story of Mahinda and King Devanampiyatissa
Tradition holds that Buddhism came to Sri Lanka through Arahat Mahinda, son of the Indian emperor Ashoka, who arrived on the island as a missionary. According to the chronicles, he encountered King Devanampiyatissa while the king was hunting near Mihintale on a Poson full-moon day. Mahinda tested the king's understanding with a famous riddle about a mango tree, and finding him wise, began to teach.
The king and his court embraced the new teaching, and Buddhism rapidly took root, becoming central to Sri Lankan identity. Mihintale, where this meeting is said to have happened, is revered as the cradle of Sri Lankan Buddhism, and Anuradhapura grew into one of the great Buddhist capitals of the ancient world.
How Poson is observed
Like Vesak, Poson is a deeply religious occasion. Devotees dress in white, observe precepts, visit temples and spend the day in meditation and reflection. Pilgrimage is a particular feature of Poson: huge numbers of people travel to Anuradhapura and climb the steps of Mihintale to worship at the sites associated with Mahinda's arrival.
The festival shares Vesak's vocabulary of light and giving. Lanterns are lit, devotional songs are sung, and the merit-making spirit is strong — though Poson's tone leans more towards pilgrimage and historical commemoration than Vesak's island-wide spectacle.
Dansals and displays at Poson
Poson is, after Vesak, the second great season for dansals. Along the pilgrimage routes to Anuradhapura and Mihintale, and in towns and cities across the country, volunteers set up stalls to feed and refresh the travelling crowds. Kanji, rice meals, cool drinks and sweets are given freely to pilgrims and passers-by alike.
Thoran and lanterns also appear at Poson, particularly in and around the sacred cities, though usually on a smaller scale than Vesak. The combination of pilgrimage, lights and roadside generosity gives Poson its distinctive atmosphere — devotional, communal and quietly joyful.
Visiting during Poson
If you want to experience Poson at its source, Anuradhapura and Mihintale are the places to go — but be prepared for very large crowds and book transport and accommodation well ahead. For a quieter experience, the festival is celebrated in every town, and you will find dansals and displays close to wherever you are.
Use the map to find dansals, thoran and lantern zones active near you during the Poson period, and plan your evening around the displays you most want to see.
Frequently asked questions
- What does Poson celebrate?
- Poson commemorates the introduction of Buddhism to Sri Lanka by Arahat Mahinda, who is said to have met King Devanampiyatissa at Mihintale on a Poson full-moon day.
- When is Poson?
- Poson falls on the full-moon Poya day of June, the month after Vesak. The exact date follows the lunar calendar.
- Where is the best place to experience Poson?
- Anuradhapura and the nearby rock temple of Mihintale are the spiritual heart of Poson, drawing large numbers of pilgrims. The festival is also celebrated nationwide.
- Are there dansals at Poson too?
- Yes. Poson is the second-biggest season for dansals after Vesak, especially along the pilgrimage routes to the sacred cities.