South Dakota's public universities will offer price breaks starting next summer for new students from most neighboring states.
They will pay the same rates as South Dakota students.
The state Board of Regents decided Wednesday the deal would apply to students from Iowa, Nebraska, North Dakota, Montana, Wyoming and Colorado.
Minnesota already has a tuition arrangement with South Dakota.
Some of South Dakota's state universities already have individual agreements.
Regents will set 2019 tuition in early April at Black Hills State University in Spearfish.
"This is an important demographic for us to engage," Regents President Kevin Schieffer said in a statement announcing the decision.
State university campuses have struggled for years against declining enrollments.