Ayathrem

Ayathrem is associated with vegetation, believed to be the first sign of life after creation. This festival marks the return of cattle from grazing in faraway lands. Zoroastrians celebrate it on the 206th to 210th days, usually October 12 to 16.

Zoroastrians observe six seasonal festivals that celebrate the sanctity of God’s universal creations. Each Gahambar lasts five days and honors the five material creations: earth, water, plants, animals and humans. Believers spend the first four days reciting scriptures and come together on the last day for a feast.

Sourced from https://theguibordcenter.org/zoroastrian-holy-days-and-observances/