The advent of spring in February-March and the vernal equinox - these are the two events that usher in Jamshed-e-Navroz. The actual time when the changes take place is noted down in Iran and then the information is sent all over the world to Zoroastrians.

This festival is mentioned in Shah Nameh, the Persian `Book of Kings' written by Firdausi. According to Firdausi's book, this festival was celebrated by the kings of Persia, Cyrus and Darius, to rejoice in the spring and in their own glory.

According to popular legend, the mythical Persian king Jamshed was the first to celebrate this festival. The Shah Nameh states that the feast commemorates the ascent of King Jamshed into the skies, in a chariot built by the demons he had subdued and forced into the service of mortals.

Named after the king, Jamshed-e-Navroz appears to have been a pagan pastoral festival that marked the transition from winter to summer. The rites of fertility and procreation can be perceived in some of its customs.