Hurst, 15, and Shin, 13, both posted 2 and 1 victories in the semifinals Friday at Carmel Country Club. Hurst defeated stroke-play medalist Mina Harigae and Shin bested Western Junior winner Alexandra Bodemann.
Before that, Hurst needed 19 holes to defeat Tanya Wadhwa of India in the quarterfinals, while Shin rolled over Michelle Shin (no relation) 4 and 3.
Saturday's final will begin at 7:00 a.m. (et) at the 6,396-yard, par-72 South Course at Carmel Country Club. The second 18 holes is scheduled for 11:45 a.m.
On Friday, Hurst fell behind in her semifinal when Harigae birdied the par- four first for a 1-up lead. She squared it with a par at the par-5 fifth, then took a 1-up lead of her own with a birdie at the next.
Harigae pulled even when Hurst bogeyed the par-3 seventh, and she regained her 1-up lead with a birdie at the eighth. Hurst then squared the match around the turn with a par at the ninth.
The back-and-forth continued until Hurst took the lead for good with a birdie at the par-four 13th. She extended her advantage to 2-up at the 16th despite bogeying the hole (Harigae had a double bogey), and then closed it out with a par at the 17th.
Hurst will be competing for the championship just three months following the death of her father, Joe, in April. She also played in her first U.S. Women's Open last month.
'It's really hard, I guess,' Hurst admitted. 'He'd be really proud, especially with me going to the Open. It was his favorite event.'
Shin had an easier time on Friday knocking off Bodemann, though she had to fend off several comeback challenges.
After carding a par at the par-4 fourth to take a 1-up lead, Shin never trailed in the match. Her advantage reached 3-up on three separate occasions, but each time Bodemann came back to win the next hole.
Shin parred the 15th for her final 3-up lead, then made a mess of the 16th, where her double-bogey was easily trumped by Bodemann's birdie. However, Shin closed out the match one hole later when both players made par.
'I came this far, but I didn't expect this to happen,' said Shin.