What is the name of the first month in the Zoroastrian calendar?

The first month in the modern Zoroastrian calendar is Farvardin. The name derives from the Avestan Fravašinąm and is associated with the frashis, or guardian spirits of the righteous dead, who hold an important place in Zoroastrian religious tradition.

Farvardin begins the twelve-month sequence used in contemporary Iranian Zoroastrian calendars. It is followed by Ordibehesht, whose name comes from Asha Vahishta, the divine principle of “Best Truth” or “Best Righteousness.” The names of the months preserve the older practice of dedicating months and days to divinities or sacred qualities.

In the Solar Hijri calendar, which shares these Persian month names, Farvardin is also the first month and has 31 days. It generally falls from late March to late April and begins around Nowruz, the Iranian New Year. Zoroastrian calendar traditions have varied historically, however, and some evidence suggests that Dae may once have been treated as the first month in an older arrangement. The standard modern order nevertheless begins with Farvardin.

Dey, Azar, and Ordibehesht are all genuine month names, but they occur later in the sequence: Dey is tenth, Azar ninth, and Ordibehesht second.