Mangoes grow all year round, with a peak harvest season from March to June. There are three harvesting groups depending on the major producing regions in Thailand.
Nam Dok Mai harvest calendar is categorized into three groups based on the major producing regions.
- Group 1: cultivating area in almost all of Chiangmai province, Chiang rai, some in Pa Yao, some in NAN, some in Pitsanulok, some area of Suphanburi, some area in Petchaboon, Chachoengsao province, some in Prachinburi province and some in Pra Juab Kee Ree Khun.
- Harvesting Period: March till early May
- Group 2: the rest area of Chiangmai, the rest area in Pa Yao, some area in Nan, the rest area in Pitchanulok, the rest in Petchaboon, the rest area in Prachinburi, Sa keow, the rest in Pra Juab Kee Ree Khun, Udon Tani, Kalasin, Khon Khean and Nakorn Prathom.
- Harvesting Period: April till middle June
- Group 3: cultivating area in Proaw district-Chiangmai, Pua, and Phu Piang in Nan province, Loei province.
- Harvesting Period: May maybe till July in some areas.