Full Moon Vegetarian Days in Vietnam: Dates and How to Use Them

Short answer: Many Vietnamese Buddhists eat vegetarian on the 1st day (mùng 1) and the 15th day (rằm, the full moon) of every lunar month. On those days vegetarian restaurants are busier, markets sell more chay dishes, and some ordinary stalls add a vegetarian option. The next dates are 24 October, 9 and 23 November, and 9 and 23 December 2026, 8 and 22 January 2027, then Tết on 6 February 2027 and the first full moon of the year on 20 February 2027.

Why the 1st and the 15th matter

Vietnam uses the Gregorian calendar for business and government, but religious life, family rituals and many festivals follow the lunar calendar (âm lịch). Each lunar month starts on the new moon, so the 15th falls on or near the full moon. In Vietnamese Buddhist practice, these two days are times for visiting pagodas, making offerings at the family altar and eating vegetarian food as a form of merit and self-restraint.

The two-day practice is the most widespread, and it is what most people mean when they say they "eat chay on mùng 1 and rằm". More devout households keep longer schedules. Vietnamese religious writing describes options of four days (the 1st, 14th, 15th and last day of the month), six days, eight days and ten days per lunar month, while monks, nuns and some lay people eat vegetarian every day (ăn chay trường). You do not need to memorize the longer lists. What matters for a traveler is that demand for vegetarian food peaks around the 1st and the 15th, and that the full moons of a few special months are bigger occasions.

Upcoming lunar vegetarian days (October 2026 – February 2027)

We checked these dates against Vietnamese lunar calendar tables. Lunar months have 29 or 30 days, so the Gregorian dates shift every month; always confirm with a local calendar app if you are planning far ahead.

Two other full moons are worth knowing even though they fall outside this window. Rằm tháng Bảy (the 15th of the 7th month, usually August or September) is Vu Lan, a festival of gratitude to parents, when pagodas fill up and many families eat vegetarian. The Buddha's birthday (Phật Đản), observed by Vietnamese Buddhist organisations on the 15th of the 4th lunar month, usually lands in May or June.

What changes in the street on vegetarian days

If you are in a city on mùng 1 or rằm, you will notice a few things. Vegetarian restaurants and cơm chay buffets get crowded at lunch, roughly 11:00 to 13:00, and the best dishes behind the glass can sell out early. Markets have more stalls selling vegetarian sticky rice, spring rolls, braised tofu and mock meats, often from early morning. Flower and fruit sellers set up near pagodas, and the pagodas themselves are busy in the evening, when people come to pray and make offerings.

Some general street vendors who normally sell meat dishes will also make a vegetarian version for the day, for example noodle soup with a vegetable broth. That is welcome, but it is also where vegans need to stay alert: a stall that cooks chay once or twice a month is more likely to use a shared ladle, a shared oil or a standard seasoning powder than a kitchen that cooks vegetarian every day. Our guide to hidden fish sauce and egg in Vietnamese food lists the questions to ask.

How vegans can plan around the lunar calendar

Treat vegetarian days as a bonus rather than the backbone of your trip. If banh mi is on your list, our Vegan Banh Mi section shows how to order one that is fully plant-based on any day. Cities like Saigon, Hanoi, Hue and Da Lat have vegetarian food every day of the month, so you will not go hungry on the 7th or the 22nd. What the 1st and 15th give you is variety: more choice at markets, special dishes at pagodas and the chance to see how local people eat when they eat chay.

• Go early on the day. Market stalls selling vegetarian breakfast often start around 6:00 and are thinning out by 9:00.
• Book or arrive before noon for buffets. Popular cơm chay places can run out of their most popular dishes by early afternoon.
• Visit a pagoda in the evening, respectfully. Wear clothes that cover shoulders and knees, keep your voice down and avoid photographing people praying.
• Use the eve as well. Some families start eating vegetarian the evening before, and vendors prepare in advance, so the 14th and the last day of the month can also have extra choice.
• Keep a 24/7 option in your pocket. On busy days queues can be long, and on Tết many stalls close entirely, so it helps to know a place that never closes.

Tết: the one time vegans need to plan

Lunar New Year is the exception to the "you will always find food" rule. In the days around Tết, which falls on 6 February 2027, a large share of small family stalls close because their owners travel to their home provinces. Big restaurants, hotels, convenience stores and chain shops are more likely to stay open, but opening hours become irregular. Traditional Tết food is also heavy on meat, from bánh chưng (square sticky rice cake, usually filled with pork and mung bean) to braised pork with egg.

The good news is that vegetarian versions of Tết dishes exist, including bánh chưng chay filled only with mung bean, and that the first full moon after Tết is one of the most important pagoda days of the year. For a practical plan, book accommodation with a kitchen or near a 24/7 shop, buy some fruit, bread and snacks the day before New Year's Eve, and check our Food Trip Planning section for Tết-specific itineraries.

How to check the lunar date yourself

You do not need a paper calendar. Vietnamese wall calendars and tear-off daily calendars print the lunar date in small numerals under the Gregorian date, and you will see them in shops and homes. On your phone, any Vietnamese lunar calendar app or a search for "lịch âm hôm nay" (today's lunar date) shows the current day. The easy tell on the street is visual: when you see people burning offering papers in small metal bins, extra flowers on sale and incense smoke outside shops, you are probably on or around the 1st or the 15th.

One small note on accuracy. The Vietnamese lunar calendar is calculated for Vietnam's time zone, so on rare occasions a new moon falls on a different Gregorian day in Vietnam than in China. For Vietnam travel, use a Vietnamese source, as we did for the table above.

Sources

• Vietnam National Authority of Tourism – vietnam.travel
• National Geographic, "How Hue became the vegetarian food capital of Vietnam" – nationalgeographic.com
• Thư Viện Pháp Luật, Vietnamese lunar calendar 2026 and Tết 2027 dates – thuvienphapluat.vn

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