Why is Navratri celebrated four times a year. Navratri is celebrated four times a year in Hindu calendar as it aligns with key seasonal transitions and changes in natural energy cycles. Chaitra Navratri (March-April) marks the beginning of Hindu lunar calendar year. Sharad Navratri (September-October) is the most widely celebrated Navratri. Ashadha Navratri (June-July) and Magha Navratri (January-February) are Gupt (secret) Navratris.