The fair place to meet is Albuquerque, NM — the city closest to the midpoint of Austin and Boise. From the farther side that’s about 16 hr 19 min of driving.
Recommended midpoint
Albuquerque, NM
From Austin
12 hr 54 min
615 mi to Albuquerque
From Boise
16 hr 19 min
779 mi to Albuquerque
Austin has the shorter trip; the split is off by about 3 hr 25 min. The alternatives below can even it out. Austin and Boise are about 1,369 miles apart.
Austin and Boise are about 1,369 miles apart by road. Split the difference and you arrive near Albuquerque, the city closest to the halfway point between them. That puts roughly 12 hr 54 min of driving on the Austin side and 16 hr 19 min on the Boise side — the fairest single meeting point among the cities near the middle.
Over this distance most people will fly rather than drive the whole way. Albuquerque still makes a fair, central place for Austin and Boise to converge, splitting the travel instead of asking one side to cross the country.
If Albuquerque doesn't have what you're after, Denver and El Paso are also close to the midpoint and worth a look — each keeps the drive reasonably balanced between Austin and Boise.
Albuquerque is the most populous city in the U.S. state of New Mexico. Founded in 1706 as La Villa de Alburquerque by Santa Fe de Nuevo México governor Francisco Cuervo y Valdés, and named in honor of Francisco Fernández de la Cueva, 10th Duke of Alburquerque… Read more →
Austin is the capital city of the U.S. state of Texas. With a population of 961,855 at the 2020 census, it is the 12th-most populous city in the U.S., fifth-most populous city in Texas, and second-most populous U.S. Read more →
Boise is the capital and most populous city in the U.S. state of Idaho. It is the county seat of Ada County. The population of the city was 235,685 at the 2020 census. Read more →
City descriptions adapted from Wikipedia (CC BY-SA); photos via Wikimedia Commons, credited above.
Estimates use straight-line distance and typical road speeds; real drive times vary with route and traffic.