Gordon Lee will host Lakeview at 5 p.m. on Thursday after the Lady Warriors beat LaFayette in their first-round game on Tuesday.
Lakeview handed Gordon Lee a 4-0 defeat in the regular season finale.
Top-seeded Heritage is still awaiting the winner of the Dade County-Rossville preliminary game, which was rained out on Monday.
Ringgold will await either Heritage, Dade County or Rossville in the other semifinal. The Lady Tigers advanced with a win over Chattanooga Valley on Tuesday.
The NGAC finals is set to begin on Friday with Game 1 at the home of the lowest-remaining seed. Game 2 and Game 3, if needed, will be played at the home of the highest-remaining seed on Saturday.