Vassa: What is Buddhist Rains Retreat?

What is the Buddhist Rainy Season or Rains Retreat (Vassa)? What is the Rains Retreat or "Buddhist Lent"? Understanding the Vassa and Kaṭhina ceremonies

Each year, Theravāda Buddhist monastics all over the world make a determination to stay in a single monastery for a three-month period of the Rainy Season also known as the Vassa, the Rains Retreat. This year it begins July 10th.

One will hear the term “Vassa” often in this article, so please bear it in mind. Traditionally, it starts the day after the Full Moon Day in July or the day after the Āsāḷha full moon as it is known in the Pāḷi language.

If monks move around a lot and one needs to rely on a teacher, one can at least expect monks to stay at a single monastery for a full three months without moving around. Some make determinations to practice harder, while others who already follow a steady practice simply continue their daily routine as usual.

In this article, let's look at the origins of Vassa, the different types, the allowances to leave the Vassa on business or emergencies, if it affects the age of a monastic, and what happens at the end of the Vassa.

The Origins of Vassa

During the Buddha’s time, monastics (samanas or "wandering ascetics") wandered on foot between different monasteries (viharas), forests, groves, and villages. They would wander during all times of the year, even during the period or season of heavy rains. However, laypeople—especially farmers—began to complain:

“How can the Sakyan [Scythian, Saka, Shakyian] monastics go wandering in the winter, in the summer, and even during the rainy season? They’re trampling down the green grass shoots, oppressing one-sensed living being, and destroying many small creatures. Even the monastics of other doctrines (religions), with their flawed (imperfect) teachings, settle down for the rainy season. Even birds make a nest in the top of a tree and settle down for the rainy season. But not so the Sakyan monastics.”

Out of compassion and to match the culture of the time, the Buddha responded with a new instruction: Anujānāmi, bhikkhave, vassaṁ upagantun'ti. “I allow you, monastics, to enter the rains residence.”*

This rule brought the monastics the Rains Retreat period of three months that met the expectations of the lay communities during the time of the Buddha. It now inspires the practice and striving of monastics, as it has for generations, all the way to the present. Moreover, it inspires laypeople in the present.

Two Kinds of Vassa

The Buddha allowed for two entry points into the Rains Residence: Dvemā, bhikkhave, vassūpanāyikā: purimikā ca pacchimikā ca: “There are two entries, the earlier and the later.” Purimikā (First Vassa) begins the day after the Āsāḷha full moon. Pacchimikā (Second Vassa) begins one month later.

Sometimes referred to as “Second Vassa.” This allowance for two Vassas shows the Buddha’s practical wisdom and compassion because not everything goes right the first time, as will be discussed later. It should be noted that the determination to stay in one monastery for three months is actually the day after the full moon day. This is when the new month starts.

Although most monasteries have the Vassa ceremony on the full moon day and it is a time for a large gathering, that is just for laypeople because they have that day off. Monastics really make the official determination the next day. Most of laypeople will probably never know it really happens on the next day.

Leaving during Vassa: seven-day business rule

Monastics are expected to remain in their Vassa location for the full three months. However, issues may come up where a monastic needs to leave. The Buddha allowed what is called, Sattāhakaraṇīya or “seven-day business.” Some of the many valid reasons include: More

• Bhante Subhuti (US student of Pa Auk Sayadaw), American Monk.org, July 10, 2025; Amber Larson, Dhr. Seven, Pat Macpherson (eds.), Wisdom Quarterly