I was wondering if Nowruz is halal to celebrate. As well as if the holiday has any significance for the Shia. If there are any hadith that shows the significance of Nowruz, what is the grade of the hadith (sahih or da'if)?

If it does have significance within the Shia, why was it commonly associated with other ancient roots?

We do have some narrations for Nowruz but they are generally seen as weak narrations. There is no harm in celebrating Nowruz and it’s done by different nationalities of Shia’s especially Iranians.

Allah knows best.