Zoroastrians worldwide celebrate Nowruz as the first day of the New Year. Parsi Zoroastrians of South Asian origin celebrate it as "Nowroj", "Navroz", or "Navroj" on the fixed day of March 21, while Zoroastrians of Iranian background generally celebrate, like other Iranians, on the actual Spring Equinox date. Because different Zoroastrian communities in India/Pakistan and Iran have evolved slightly different calendar systems, there is some variance. Adherents of the Fasli variant of the Zoroastrian calendar celebrate Nowruz in March, but today, most other Zoroastrians also celebrate on this day.

Other variants of the Zoroastrian calendar celebrate the Nowruz twice: once as Jamshedi Nowruz on March 21 as the start of spring, and a second Nowruz, in July/August (see Variations of the Zoroastrian calendar), as either New Year's Eve or New Year's Day. That the second Nowruz is celebrated after the last day of the year, known as Pateti, which comes after a Muktad period of days remembering the dead. Many Parsis are confused by this, and mistakenly celebrate Pateti as if it were Nowruz, when in fact Nowruz is the day after. Some attribute this confusion by some as celebrating the last day of the year (contrary to what might be expected from a term that means "new day"), may be due to the fact that in ancient Persia the day began at sunset, while in later Persian belief the day began at sunrise.

Zoroastrians of Iranian origin generally put up a Haft Sheen table while Muslim Iranians put up Haft Sin table. The difference is because Muslims can not put wine (Sharab) on the table. Zoroastrians of Parsi (South Asian) origin do not traditionally use a Haft Sin. They set up a standard "sesh" tray – generally a silver tray, with a container of rose water, a container with betel nut, raw rice, raw sugar, flowers, a picture of Zarathustra and either a floating wick in a glass filled with water topped with oil for fuel, or an "afargania", a silver urn with a small fire nourished by sandalwood and other fragrant resins.