The teenager was part of a group hiking to Sunrise Hut and became separated from the group during a hike, according to an email the school sent to parents on Wednesday morning.
Hawke's Bay Area Commander Inspector Caroline Martin said police were told the teenager was missing at about 7.10pm on Tuesday.
"Police were made aware a teenager had separated from their group while on a school tramping trip and was missing," Martin said.
"Police, alongside Land Search and Rescue volunteers, responded immediately and conducted extensive ground searches in the Sunrise Hut area until the early hours."
Martin said the search was continuing on Wednesday, with field teams searching the area and specialist equipment and resources being used. Police remain in contact with the teenager's family and the school.
Taradale High School said it remained focused on supporting the student's family and the school community while police coordinate the search. The students who took part in the trip were returning to school.