The women, all regular labourers, were working at Lopohia tea estate under Pulibor police station when they were struck by lightning and died on the spot.
The trio have been identified as Rita karmakar (28), Urmila Nayak (26) and Ruma Nayak(28), who were plucking tea leaves in plot-B, section-15 of the estate.
The tea garden is owned by Barooah and Associates.