A father and his two girls aged 11 and 14 are missing in Days Bay, near Wellington, after failing to return from a hike.
They set out from Lees Grove in Wainuiomata at midday yesterday and were due to return home at 3.30pm.
Police were contacted by a concerned family member at 6pm.
Eight teams of three people searched overnight for the 50-year-old man and his daughters.
Police yesterday asked the public to stay away from the East Harbour Regional Park while police dogs tracked the group.
MetService said the temperature overnight was between 8C and 11C in the area where the family went missing.
They appealed for anyone who has information to contact police on 04 381 2000 or 105.