Naditriratra Vrata literally translates to the “Three-Night River Vow” (Nadi meaning river, and Triratra meaning three nights).
Depending on the specific text or tradition you are referencing, this term points to two distinct but highly revered observances in Hindu practice: the ancient scriptural vow dedicated to sacred rivers, and the intense Navaratri observance dedicated to the Goddess.
1. The Scriptural Vow: Nadi-Triratra (Padma Purana)
The exact Nadi-Triratra Vrata is detailed in Chapter 70 of the Padma Purana (Uttara Khanda). It is a vow of gratitude and reverence directed toward the sacred rivers that sustain life and agriculture.
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Timing: It is observed during the rainy season, specifically starting in the month of Ashadha, when the rivers are fully flooded.
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The Ritual: Devotees fast for three consecutive days and nights (or eat only once a day if a full fast is not possible). They visit a flooded river in the morning to bathe and offer prayers to Lord Vishnu, Lord Varuna (the deity of water), and specific sacred rivers like the Sindhu, Tapi, and Godavari. During these three days, devotees intentionally avoid drinking river water.
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Offerings: The daily worship involves offering lighted lamps into the river, along with seasonal fruits, coconuts, pumpkin gourds, and bamboo baskets filled with seven kinds of grains.
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Significance: The Padma Purana states that completing this vow over three consecutive years grants the devotee a long life, unwavering health, prosperity, and continuous lineage.
2. The Devi Navaratri Observance: Triratra Vratam
In contemporary regional practice—especially prominent within Telugu traditions and local Devi temples—you will frequently hear of the Triratra Vratam. While it drops the “Nadi” (river) aspect, it centers entirely on the rigorous “three-night” dedication.
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Timing: It is strictly observed during the final three, highly potent days of Dasara / Sharad Navaratri (Saptami, Ashtami, and Navami).
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The Ritual: This vow is dedicated directly to Goddess Lalitha Tripura Sundari (or Goddess Durga). Devotees maintain absolute purity, fast, sleep on the floor (bhushayanam), and recite powerful chants like the Lalitha Sahasranama multiple times a day.
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Significance: Because it concentrates the spiritual energy of the entire nine-day festival into three intense days of discipline, it is believed to bring immense grace, spiritual clarity, and the fulfillment of deep desires.