Tarpan can be performed in Haridwar on various occasions:
Daily (Nitya Tarpan): Traditionally, devout Hindus may perform Tarpan daily after their morning bath. Doing this at a holy place like Haridwar adds merit.
Pitru Paksha: This 16-day period is the most important time for ancestral rites. Performing Tarpan daily throughout Pitru Paksha in Haridwar is highly recommended and considered very beneficial.
Amavasya (New Moon): Every Amavasya is considered auspicious for Pitru Tarpan. Sarva Pitru Amavasya (the Amavasya during Pitru Paksha) is especially significant.
During Shradh: Tarpan is an integral part of the Shradh ceremony, performed before Pind Daan.