Onam 2026: Thiruvonam Date, 10-Day Calendar & the Legend of King Mahabali
Last updated: 6 August 2026
Muhurat
Onam 2026 falls on Wednesday, August 26 — that is Thiruvonam, the festival's main day. The ten-day celebration begins with Atham on August 16, and Kerala observes four consecutive public holidays from August 25 (First Onam) through August 28 (Fourth Onam), with Thiruvonam itself, the biggest day, on August 26 as Second Onam. These dates are confirmed against Drik Panchang's Thiruvananthapuram, Kerala calendar for 2026.
When Is Onam 2026? Key Dates at a Glance
Onam is a solar festival — its date is fixed by the Malayalam Chingam month and the Thiruvonam nakshatra, not by a moving lunar tithi, so it does not shift the way Ekadashi or Purnima dates do. Here is the at-a-glance calendar for 2026.
Occasion
Date (2026)
Day
Atham (Onam festivities begin)
August 16
Sunday
First Onam (Uthradam)
August 25
Tuesday
Thiruvonam / Second Onam (main day)
August 26
Wednesday
Third Onam (Avittam)
August 27
Thursday
Fourth Onam (Chathayam)
August 28
Friday
Kerala's four-day Onam holiday runs from First Onam (Aug 25) to Fourth Onam (Aug 28), with Thiruvonam on Aug 26 as the most significant of the four. On Thiruvonam day itself, the Thiruvonam nakshatra runs from 12:21 PM to 2:18 PM in Kerala — the Madhyahna (midday) window during which the nakshatra must prevail for that solar day to be named Thiruvonam.
The Full 10-Day Onam Calendar: Atham to Thiruvonam
Traditional Onam observance runs across ten named nakshatra days, each with its own small ritual, starting with Atham and ending on Thiruvonam. Pookalam — the flower carpet at the doorstep — grows a little larger and more elaborate on each of these days.
Note that Pooradam spans two civil days this year (23rd and 24th) because the nakshatra's Madhyahna presence carries over — a normal feature of the solar Panchang, not an error. After Thiruvonam, celebrations continue for two more official holidays, Third Onam (Avittam, Aug 27) and Fourth Onam (Chathayam, Aug 28), which is why the full festive season is often called "twelve days of Onam" even though the core ten-nakshatra cycle ends at Thiruvonam.
Onam also sits inside the Malayalam solar month of Chingam, which opens the Kollam Era calendar year. In 2026, Chingam 1 (the first day of the Malayalam new year) falls on August 17 — the day after Atham — so the opening of Onam season and the start of the Malayalam year arrive almost together this year.
Why Do We Celebrate Onam? The Legend of King Mahabali
Onam commemorates the yearly homecoming of King Mahabali, the asura king whose reign over Kerala is remembered as a golden age of justice, prosperity and equality — a time when, tradition says, there was no theft, no falsehood and no suffering. Mahabali's growing power alarmed the Devas, who turned to Vishnu for help. Vishnu took the form of Vamana, a young Brahmin boy, and approached Mahabali during a yagna to ask for only as much land as he could cover in three steps. The generous king agreed, ignoring his guru Shukracharya's warning. Vamana then grew to cosmic size: his first step covered the earth, his second the heavens. With nothing left to offer for the third step, Mahabali bowed his head, and Vishnu placed his foot there, pressing the king down to Patala, the netherworld. Moved by Mahabali's humility and devotion, Vishnu granted him a boon — that once every year, he could return to visit the land and people he loved. Onam marks that annual return, and Malayalis across the world welcome him home.
A well-loved Malayalam folk song, "Maveli Naadu Vaneedum Kaalam," is sung across Kerala during the Onam season. It recalls Mahabali's rule as a time of such fairness that no one lied, no one stole and no one went hungry — the cultural memory that gives the festival its emotional weight, beyond the ritual calendar.
How Onam Is Celebrated: Pookalam, Vallam Kali and More
Onam blends devotion, art and community celebration across its ten-day run. The most visible traditions include:
Pookalam — intricate floral rangoli laid at the entrance each morning from Atham onward, growing larger daily to welcome Mahabali.
Onathappan — small clay or mud idols representing Mahabali and Vamana, placed at the centre of the Pookalam.
Vallam Kali — the famous Kerala snake boat races, held on backwaters such as the Pamba during the Onam season.
Pulikali — the "tiger dance," where performers painted as tigers and hunters dance through the streets, most famously in Thrissur.
Onakodi — new clothes gifted to family members, worn on Thiruvonam day.
Thiruvathirakali and Kaikottikali — traditional group dances performed by women around a lit lamp.
What Is Onasadya? Kerala's 26-Dish Feast
Onasadya is the grand vegetarian banquet served on Thiruvonam, traditionally on a fresh banana leaf and eaten seated on the floor. A full sadya typically runs to 26 or more dishes, balancing all six tastes (shadrasa) in one meal — sweet, sour, salty, bitter, pungent and astringent.
Kerala matta rice with ghee (neyyu)
Parippu (moong dal) and sambar
Avial, olan, kaalan and erissery (mixed-vegetable curries)
Thoran (stir-fried vegetables with coconut)
Pachadi and kichadi (yogurt-based sides)
Pickles and banana chips
Papadam
Payasam — the closing sweet, often served in two or three varieties
The abundance and generosity of the sadya intentionally echo Mahabali's own reign — a table where everyone eats their fill, regardless of status, mirrors the equality his kingdom was famous for.
How Do Malayalis Abroad Celebrate Onam?
Onam travels well. Large Malayali communities in the UAE, Qatar, Saudi Arabia, the US and the UK organise their own Pookalam competitions, community sadyas and cultural programmes, often on the nearest weekend to Thiruvonam rather than the exact date, since Aug 26 falls on a working Wednesday in most host countries. Families far from Kerala can still keep the spirit of the day simple and meaningful — a small flower arrangement at the door, a home-cooked sadya-style thali, and a diya lit for Mahabali's visit carry the same intention as the full ten-day version back home.
Is Onam a Hindu festival or a harvest festival?
Both. Onam is rooted in the Vishnu-Mahabali legend but is also Kerala's harvest festival, marking the end of the monsoon and the start of the Chingam agricultural cycle. It is celebrated across religions in Kerala as a cultural and harvest occasion, which is part of why it holds official state-holiday status.
What is Atthachamayam?
Atthachamayam is the grand procession held on Atham day (August 16, 2026) in Thrippunithura, near Kochi, featuring folk art forms, elephants and music — traditionally seen as the ceremonial opening of the Onam season.
How many days is the Onam holiday in Kerala?
Kerala's government declares four consecutive public holidays: First Onam (Aug 25), Second Onam/Thiruvonam (Aug 26), Third Onam (Aug 27) and Fourth Onam (Aug 28) in 2026. Many households, though, begin observance ten days earlier, on Atham.
Why does the date of Onam change every year on the Gregorian calendar?
Onam follows the Malayalam solar calendar, which is fixed to a sidereal solar year rather than the Gregorian one. Because a sidereal solar year and a Gregorian year are not perfectly equal in length, Thiruvonam drifts by a few days from year to year — landing in late August or early September, unlike a fixed-date festival.
Read Daanyam's full Onam 2026 guide for detailed puja vidhi, the Thiruvonam muhurat, and a Gau Seva offering in Mahabali and Vamana's honour.