Shradh can be performed in Haridwar on several occasions:
Pitru Paksha: This 16-lunar day period (usually Sept/Oct) is the most auspicious time dedicated solely to ancestor worship. Performing Shradh in Haridwar during Pitru Paksha is considered highly meritorious.
Death Anniversary (Tithi): Performing Shradh on the annual Tithi (lunar date) of the ancestor’s death according to the Hindu calendar is a primary observance.
Amavasya (New Moon): Every Amavasya is suitable for Tarpan and Shradh, especially the Amavasya during Pitru Paksha (Sarva Pitru Amavasya).