The couple plan a March 25 wedding at 2 p.m. at the Christian and Baptist Church in Mountain Home.
Jamison and Cash are both former graduates of Mountain Home High School. Ryan is employed currently at Micron in Boise.
The couple plan to make their home in Mountain Home.
Ashley's parents are Allen and Linda Jamison of Mountain Home, and Ryan's parents ae Christy Case of Mountain Home and Dan Cash of Tennessee.