| 1: Onwa Mbu | This is the first month in the Igbo Calendar and it starts at the end of February, or when the new moon appears in February of each Gregorian year. Onwa Mbu ends after about 28 days when the new moon appears again in March. |
| 2: Onwa Abuo | This is the second month in the Igbo Calendar, and it starts with the appearance of the new moon in March and continues for about 28 days into April when another new moon appears. |
| 3: Onwa Ife Eke | This is the third month in the Igbo Calendar, and it begins around the middle of April when the new moon appears and continues till the Gregorian month of May. |
| 4: Onwa Ano | This is the fourth month in the Igbo calendar and starts at the beginning of May when yet another new moon appears. It runs its full month cycle and enters the Gregorian month of June. Onwa Ano ends at the beginning of June. |
| 5: Onwa Agwu | This is the fifth month in the Igbo calendar. The month starts at the appearance of the moon around the beginning of June and ends when the next full moon appears in July. Onwa Agwu in the Nri Igbo calendar is the month when Agwu (the spirit of Chukwu’s divination, knowledge, and wisdom) is celebrated. This celebration however differs from region to region across the Igbo nation. |
| 6: Onwa Ifejioku | This is the 6th month of the Igbo Calendar. This month is when the New Yam festival is celebrated across Igbo land, although on different dates. This month starts at the appearance of the new moon in July and ends in August. Ifejioku is the Igbo God of yam and harvest. And no matter the diverse beliefs of the modern Igbo society, the celebration of the New Yam has become a symbol of pride and togetherness. It is important to note that other parts of Igbo land celebrate this festival till September. |
| 7: Onwa Alom Chi | This is the seventh month in the Nri Igbo Calendar. It begins with the appearance of the new moon in August and ends with the coming of the next new moon in the same month of August. |
| 8: Onwa Ilo Mmuo | This is the 8th month in the Igbo calendar, and it starts at the appearance of the new moon at the beginning of September and ends with the next new moon at the end of September. Ilo mmuo according to specific rituals in Igbo Odinala is the act of making sacrifices to deities and spirits of our land and offering them specific parts of the animal’s body. |
| 9: Onwa Ana | This is the 9th month in the Igbo calendar. It begins at the appearance of the new moon around the end of September and ends when the next new moon appears in October. Onwa Ana is dedicated to the Goddess of the land – Ana/Ala/Ani. |
| 10: Onwa Okike | This is the 10th month in the Igbo calendar. It starts at the appearance of the new moon in October and ends in early or mid-November. Onwa Okike as the name implies is set aside for the celebration of the creator, Okike. |
| 11: Onwa Ajana | This is the 11th month of the Igbo Calendar. It starts with the appearance of the new moon in early November and ends when the moon appears in December. Onwa Ajana is dedicated to the soil deity, Ajana. |
| 12: Onwa Ede Ajana | This is the 12th month in the Igbo Calendar. This month starts when the new moon appears in December and ends when another new moon appears in January of the following Gregorian year. |
| 13: Onwa Uzo Alusi | This is the 13th and last month of the Nri Igbo Calendar. It begins when the new moon appears in January and ends when another new moon appears in February signaling the beginning of another year in the Igbo Calendar. |
