Idaho High School Activities Association director John Billetz said Wednesday there was just a single vote for the rule change at a meeting in Coeur d'Alene.
The proposal emerged after Castleford High School golfer Sierra Harr helped the boys' team win the 2012 championship for Idaho's smallest schools.
Harr says rival coaches complained.
Billetz says the board's majority concluded Harr's situation happens so infrequently, it didn't merit a big change.
If enough girls turn out to form a Castleford girls' team in 2013, Harr will play with them.
If not, she can compete with the boys' team.