Thai fruit seasons by month, and how to pick fruit that is ready to eat
When durian, mangosteen, rambutan, longkong, longan, lychee and mango peak, East vs South, figures from Thai agriculture offices, and how to tell ripe fruit.
- In the East, durian, mangosteen and rambutan all peak in May. The South comes later, roughly July to September.
- Longan is around most of the year but peaks in August. Lychee peaks in May.
- Mango and durian keep ripening after picking. Rambutan does not, so buy it ready to eat.
- A pink-red mangosteen turns purple and ready to eat in about 3-4 days.
Most Thai fruit peaks in the hot season and into the early rains. The East comes first: durian, mangosteen and rambutan all peak in May. The South follows, roughly July to September. Longan peaks in August. This article puts the months in one table, using figures from Thailand’s Office of Agricultural Economics, and shows how to tell which fruit is ready to eat.
The fruit season table
The figures come from the Office of Agricultural Economics (OAE). The East column covers Rayong, Chanthaburi and Trat. Any year can shift with the weather.
| Fruit | Thai | Harvest window | Peak month | Note |
|---|---|---|---|---|
| Durian | ทุเรียน thurian | East: Jan-Jul | May (53% of the year) | South later, about Jul-Sep |
| Mangosteen | มังคุด mangkhut | East: Mar-Jul | May (42%) | South later as well |
| Rambutan | เงาะ ngo | East: Apr-Aug | May (51%) | |
| Longkong | ลองกอง longkong | East: Apr-Sep | Jul (34%) | Some sources give an October peak, depending on area |
| Longan | ลำไย lamyai | All year | Aug (24%) | Most plentiful Jul-Aug |
| Lychee | ลิ้นจี่ linchi | Mar-Jun | May (58%) | |
| Mango | มะม่วง mamuang | Late Mar-Jul | Apr-May | Off-season mangoes exist too |
There are no matching monthly figures for the South. The Tourism Authority of Thailand (TAT) suggests southern fruit routes from July to September and says Salika durian from Phang Nga is typically in season from May to July, so use those as a rough frame.
Worked example: planning with the numbers
Picking a month. Visit the East in mid-May and durian, mangosteen and rambutan are all in their peak month at once. OAE’s 2024 figures show the four fruits of those three provinces together put out about 51% of their year in May: half a year’s fruit in one month.
Longan. OAE forecast about 1.40 million tonnes of longan for 2026, with about 340,000 tonnes in August. Work it out: 340,000 ÷ 1,400,000 = 0.243, or about 24% of the year in one month. The rest is spread across the other months, which is why longan is around nearly all year but most plentiful in August.
Mangosteen. Mangosteen picked when the skin starts to show pink spots turns purple and ready to eat in about 3-4 days. Buy pink-red fruit on Monday and it should be ready around Thursday or Friday. To eat today, choose dark purple to purple-black fruit.
Fruit that ripens after picking, and fruit that does not
This matters most when you buy. Fruit falls into two groups.
- Keeps ripening (called climacteric): picked mature, then ripened. Mango and durian are in this group. You can buy them unripe and let them ripen at home.
- Does not ripen further (non-climacteric): what you pick is what you get. Rambutan is in this group, so buy it ready to eat.
Mango and durian can be bought unripe and left to ripen. Rambutan has to be ready when you buy it.
How to tell it is ready
| Fruit | What to look for |
|---|---|
| Mangosteen | Red-purple to dark purple is edible; dark purple to purple-black is best. The flesh comes away from the rind easily. |
| Rambutan (Rong Rien variety) | Red skin and hairs. Dark red with yellow hair tips means over-mature, and quality drops. |
| Durian | Growers check for a firm, dark stem, dry dark-brown spine tips, a springy feel when two spines are pressed together, visible seams between segments, and a hollow sound when knocked. It takes practice; ask the seller which day it will be ready. |
| Longan | Skin turns from green to yellowish-brown, smooth, and the fruit is plump. |
| Mango | Ripe mango is silky and fragrant. Crisp and sour means unripe; leave it to ripen. |
Durian is the hardest to judge. If unsure, buy segments already opened in a box so you can see the flesh.
Common mistakes
- Buying green rambutan to ripen at home. It will not ripen after picking.
- Choosing the darkest rambutan. Dark red with yellow hair tips is past its best.
- Using one calendar for the whole country. The East and the South are a month or more apart. Check where the fruit comes from.
- Treating the table as exact. Weather moves the season. Before a fruit trip, ask the orchard or local tourist office.
Summary
Remember three windows: May is the East’s big month for durian, mangosteen, rambutan and lychee; July to September is the South’s turn; August is longan month. When you buy, know which fruit keeps ripening and which must be ready on the stall. Next in this series: Thai markets, when to go, and what to eat at each.
Sources
- OAE: eastern fruit output, durian, mangosteen, rambutan, longkong (2024 data) — Thairath (Thai)
- OAE forecast for longan and lychee 2026 — Thai Post (Thai)
- Taste Thailand’s South by Season with Southern MUST TASTE Thai Fruits — TAT News
- A Beginner’s Guide to Seasonal Thai Fruits — Thailand Foundation
- Mangosteen: harvest and quality indices — Postharvest Technology Innovation Center, Chiang Mai University (Thai)
- Rambutan: harvest and quality indices — Postharvest Technology Innovation Center, Chiang Mai University (Thai)
FAQ
Why do websites give different months for the same fruit?
Regions ripen at different times: the East comes first, the South later, and each year's weather shifts things. Treat the months here as a guide, and check with the orchard or local tourist office before travelling for fruit.
Can I tell a ripe durian by knocking on it?
Growers knock to judge whether a fruit is mature: a mature durian sounds hollower than an immature one. It takes practice. As a buyer, ask the seller which day it will be ready, or ask them to open it for you.
Can I find these fruits out of season?
Some, yes. Longan is harvested across the whole year and there are off-season mangoes. But in peak months the fruit is easier to find, fresher and more varied.
Ingredients and heat vary by kitchen and recipe. If you have a food allergy, ask before you order, every time.