For Texas, the big one is UNT, however you will not be given enough opportunities as an undergrad there. Texas Tech has a very good Tuba/Euphonium studio under Dr. Wass. However, there are usually only 1-3 spots open so it’s extremely competitive. TCU has a good program, but I am unfamiliar with who teaches there. UTSA, UT, and WTAMU all have good programs as well, but most are taught by a trombone player. You might look at schools in Oklahoma as a possible option depending on your location! I wouldn’t discount teaching yet, most schools don’t require education courses until junior year. It is much easier to have a career with a teaching certificate as a backup!
Adams E1 Gold Brass Bell and SS Leadpipe
Undergrad at Angelo State
Future TA at University of Oklahoma