Ever since people settled in places and began to cultivate their land, their existence was based on sowing and harvest.
Many cultures, from ancient Egypt through the Greeks and Anglo-Saxons to today, celebrate with festivals and feasts for a good harvest. There were two main harvests in the Middle Ages. The first, early in summer, was when meadows were cut and the hay was gathered to feed the animals over winter. The second, towards the end of summer, was when fruits and grains were harvested. The first plowing, picking the last fruits, and preparing for autumn could take place through the end of October.

Ciclo dei Mesi, Ottobre (October), c. 1390-1407, Maestro Venceslao.
The Harvest Feast in Westeros
The Harvest Feast is celebrated through all of the Seven Kingdoms, from the fertile lands of the Reach to the icy North. Celebrated by the great houses and the folk alike, it marks the end of the harvest season, when the year's crops have been collected, stored, and distributed. Rooted in the agrarian cultures of Westeros, the Harvest Feast is more than just a meal. It is a time-honored tradition that celebrates the successful gathering of crops and the survival of the people through the harsh seasons.
The Feast also serves as a reminder of the ancient relationship between humanity and nature, which is particularly important in a world where the changing seasons are unpredictable. The long, deadly winters in the North can last for years, making food scarcity a constant threat. This is especially highlighted in the Stark motto, "Winter is Coming," a reminder of the importance of preparing for hard times. For the smallfolk, the event is about survival and endurance; for the lords and ladies of Westeros, the Harvest Feast is about demonstrating their ability to provide for their people and secure their loyalty for the challenges ahead.

Augsburg Labours of the Months: Autumn (July, August, September), c. 1531-1550, Jörg Breu (1475-1537).
Regional variations
Different regions of Westeros have their own unique ways of celebrating the Harvest Feast, shaped by their local resources and cultural values. The differences are particularly noticeable in regions like the North, the Reach, and Dorne, due to their geographical climates.
The North. In the harsh climate of the North, harvests are shorter and more precarious. Northern feasts are hearty and simple, emphasizing sustenance over luxury. Meat, root vegetables, and stews dominate the tables, often accompanied by strong ales and meads. The Stark family, which rules from Winterfell, would host such a feast as a solemn occasion, focused more on gratitude and preparation for the winter than on ostentatious displays of wealth. In A Clash of Kings, Bran Stark holds the Harvest Festival in Winterfell, where many great houses of the North come together to toast the harvest and make plans for the war that has already been declared by Robb Stark.
The Reach. The fertile lands of the Reach, ruled by House Tyrell from Highgarden, provide an abundance of food, making their Harvest Feasts lavish affairs. Known for its vineyards, orchards, and golden fields of grain, the Reach boasts a table filled with fresh fruits, fine wines, and elaborate dishes. The Harvest Feast here is a celebration of plenty, where the bounty of the land is showcased as a testament to the Tyrells' prosperity and their ability to feed not just their own people but much of Westeros.
Dorne. In the arid lands of Dorne, the climate makes agriculture more challenging, but the people celebrate with a mixture of exotic fruits, spiced meats, and robust wines. The Dornish Harvest Feast is often accompanied by music, dancing, and a general spirit of celebration that reflects the region's more relaxed and pleasure-focused culture.
The Crownlands. There is also a big celebration in the Crownlands. When Sansa Stark leaves King's Landing, she regrets that she missed the harvest festival with all its splendor: the masked balls, banquets, and mummer shows. The whole city is celebrating, the streets are magnificently decorated, and the smell of fresh beer and warm food is in the air.

The Peasant Wedding, c. 1566-1569, Pieter Bruegel the Elder (c. 1525-1569).
Politics at the table
In A Game of Thrones, no feast is free from political intrigue, and the Harvest Feast is no exception. Much like the infamous wedding feasts in the series, harvest celebrations can be a venue for political maneuvering, betrayals, and power plays. As the nobles gather around the table, deals are struck, promises are made, and enemies are carefully watched. The timing of the Harvest Feast, right before winter, makes it a critical moment for lords to assess their alliances and determine their positions. The ability of a great house to throw a grand Harvest Feast not only proves its wealth but also its readiness for winter, which is crucial in a world where resources are often stretched thin.

A peasant wedding feast, Pieter Bruegel the Elder.
A reflection of larger themes
In a broader sense, the Harvest Feast reflects one of the core themes of A Game of Thrones: the struggle for survival in a world of shifting power and natural forces. It serves as a reminder that, while political games are being played, the real threat is always survival, whether from starvation, winter, or war. In this way, the Harvest Feast mirrors the nature of life in Westeros, where periods of plenty are always followed by periods of scarcity.
Fun fact
The season we call autumn was widely known as "harvest" until at least the 12th century. "Harvest" comes from an Old English word of Germanic origin, hærfest, which in some sense means "picking, plucking" (as one might pluck or pick fruits in order to harvest them). Around the 14th century, the word "autumn" (from the Latin autumnus) was introduced, and it gradually replaced "harvest" as a seasonal name.