Zoroastrianism was the dominant, pre-Islamic religion of both the Achaemenid (550-330 BCE) and Sassanid (226-650 CE) Persian empires. The religion undoubtedly exerted a powerful influence on the indigenous Kurdish religion of the Cult of Angels. Some have also speculated that the usage of fire in the Kurdish Newroz celebration stems from the special veneration shown to fire as a purification ritual in Zoroastrianism.
Historical Dictionary of the Kurds. Michael M. Gunter.