Chaitra Navratri (nine nights), as the name suggests, usually falls in the month of March or April. Normally it marks the first day of the Hindu calendar. Chaitra Navratri is observed during the Shukla Paksha or Full Moon phase in the month of Chaitra, according to the Hindu calendar. In Kashmir, it is called Navreh and in Maharashtra, the first day of the Hindu New Year is called Gudi Padwa.

Chaitra Navratri Day 1: 13th April (Tuesday) Pratipada
Chaitra Navratri Day 2: 14th April (Wednesday) Dwitiya
Chaitra Navratri Day 3: 15th April (Thursday) Tritiya
Chaitra Navratri Day 4: 16th April (Friday) Chaturthi
Chaitra Navratri Day 5: 17th April (Saturday) Panchami
Chaitra Navratri Day 6: 18th April (Sunday) Shasthi
Chaitra Navratri Day 7: 19th April 2021 (Monday) Saptami
Chaitra Navratri Day 8: 20th April (Tuesday) Annapurna Ashtami -Sandhi Puja begins at 12:19 AM on April 21 and ends at 1:07 AM on April 21
Chaitra Navratri Day 9: 21st April (Wednesday) Rama Navami
Chaitra Navratri Day 10: 22nd April (Thursday) Dashami, Navratri Parana

All nine days of the Navratri are dedicated to nine different forms of Durga or Nava Durga. The puja, rituals and offerings of each day of Chaitra Navratri differ according to form of Shakti being worshipped. The nine avatars of Durga are: Shailputri, Brahmacharini, Chandraghanta, Kushmanda, Skandmata, Katyayani, Kaalratri, Mahagauri and Siddhidatri. According of scriptures, Lord Rama, the seventh incarnation of Lord Vishnu, was born on Rama Navami.