In short: Vassa, the Rains Retreat (often called "Buddhist Lent"), lasts three lunar months, from the day after Āsāḷha Pūjā in July to Pavāraṇā in October. Monks stay in one monastery to deepen study and meditation; many lay people take up a practice or give up a habit for the season.
Ideas: keep the five precepts, give up alcohol, sit 3 minutes daily
Questions people ask
What is Buddhist Lent?
Vassa, the three-month Rains Retreat. Monks stay in one monastery from the day after Āsāḷha Pūjā (July) to Pavāraṇā (October); many lay people keep extra precepts or give up a habit.