Bay of Plenty are 17-time champions at this event but will look to win the title for the first time since 2007.
Their number two Alanna Campbell said she was happy the team could defeat Hawke's Bay/Poverty Bay and make their fourth semifinal in succession.
"That was pretty intense but Susan [Lines] chipped in for a birdie on her 18th hole to halve her match giving us a chance and we needed to then get Brooke in," she said.
"We are really excited and will relax this afternoon and then get into it tomorrow."
Campbell, who made her debut for New Zealand earlier this year, is looking forward to the challenge of taking on an in-form North Harbour side.
"They will be tough and on a high after beating Auckland but as we have seen all week every team can be beaten."
Toro New Zealand Women's Interprovincial final leaderboard:
Division One: Auckland 5 (team points) 25.5 (individual points), North Harbour 5 23.5, Wellington 4 18.5, Southland 3 12.5, Northland 2.5 12, Tasman 1 8, Otago 0.5 5.
Division Two:
Bay of Plenty 5 21.5, Waikato 5 18.5, Canterbury 4 19, Manawatu - Wanganui 2.5 14.5, Hawkes Bay 2.5 13.5, Taranaki 2 10, Aorangi South Canterbury 0 8.