Harvest festivals of Indian states occurs at the time of main harvest of a the region and people. The 28 states of India celebrated its own Harvest festival at various times throughout the year.
Major Harvest festivals in India are Makara Sankranti which is also known as Pongal, Uttarayana, Lohri, Poush Parbon and Bhogali Bihu.

Makara Sankranti – January

Makara Sankranti is one of the major Indian Harvest festival celebrated with different name and innumerable way due to the diversity of culture in India.
Festival of Makar Sankranti is most auspicious days for Hindus and take a dip in holy places like Ganga Sagar and Prayag.

Makara Sankranti is known as Pongal,Uttarayana,Lohri,Khichdi,Shishur Saenkraat and Maagh Bihu, major kite festival also held at this day in Gujarat.

Holi in February – March

The festival of colors is celebrated between the February and March month and known as Phagwah as well. Holi has many significance and one of them is changing of season and beginning of the new spring season.

Its a bid adieu to winter and welcome the season of spring with enjoyment and pray for good harvests.

Baisakhi – April

Baisakhi or Vaisakhi is the major festival celebrated across the north region of India, especially in the Punjab state.
Vaisakhi is celebrated as the Indian thanksgiving day by farmers of Pujab, praying for future prosperity and thanking God for harvest.

Rongali Bihu – April

Bihu is the national festival of Assam celebrate three time in the year, Maagh in January, Bohaag in April and Kaati in October.

Rongali Bihu or Bohag Bihu is the major among the other and most popular Bihu festival celebrated as the Assamese New Year in mid April along with Spring season.

Hareli Festival in July-August

Hareli is one of the major harvest festival of tribal Chhattisgarh state,celebrate during the holy month of Sawan or in the month of monsoon (July-August).
Cher-Chera is another most popular harvest festival of Chhattisgarh celebrated with traditional folk songs and dance like raut nacha, Panthi, Gaur Madiya and Karma in the tribal region of state.

Onam in August–September

Onam festival is the grand carnival of Kerala state, celebrated during the month of Chingam (August–September).
The ancient festival has a significance of homecoming of the legendary Emperor Mahabali and harvest of rice and rain flowers in Kerala.

Nuakhai in August–September

Nuakhai also known as Nabanna is the Harvesting Festival of Odisha celebrated in the month of August–September.
The harvest festival Nuakhai is mostly celebrated in the western region of Orissa and a major social festival of Kosal.

Diwali Festival in October-November

The festival of lights is also celebrated as Harvest Festival, as it occurs at the end of a cropping season or the last harvest of the year before winter.
Diwali is the most popular festival in India, celebrate the triumph of good over evil, in the form of lighting up of houses, burning the candles and set off fireworks.

Kut Festival in November

Kut festival is a major Post Harvest festival celebrate in the month of November by Kuki-Chin tribes. The annual festival is a leading festivals of Manipur state and does not restricted by community any more.

Another harvest festival of Manipur is Chumpha Festival,celebrated by the Tanghul Nagas tribes of the region.

Tokhu Emong in November

The festival of Tokhu Emong is celebrate by the tribes of Lotha nagas in the first week of November.
Other harvest festival of the Indian states includes Navanna in West Bengal, Wangala in Meghalaya, Pawl Kut of Mizoram and most famous Garia Puja of Tripura.