Bandera County is twenty-five miles northwest of San Antonio in the Edwards Plateau region of southwest Texas. It is bordered by Kerr and Kendall counties on the north, Bexar County on the east, Medina and Uvalde counties on the south, and Real County on the west. The county seat and largest town is Bandera. 

Bandera County comprises an area of 793 square miles, with elevations that range from 1,200 to 2,300 feet. The western part of the county is drained by the Sabinal River and the eastern part by the Medina River. The alkaline and generally shallow soils overlie limy subsoils. The vegetation consists primarily of grasses such as bluestems, grama, buffalo grass, winter grass, and wild ryes. Along the many streams of the county grow cedar, post oak, Spanish oak, live oak, pecan, and cypress trees. Deer and turkey are plentiful, but there are no large predators.

The climate features dry and mild winters and warm summers. Temperatures range in January from an average low of 36° to an average high of 69° F, and in July from 69° to 95° F. The average annual rainfall is twenty-nine inches; the average relative humidity is 76 percent at 6 a.m. and 45 percent at 6 p.m. There is no significant snowfall. The growing season averages 235 days a year, with the last freeze in late March and the first freeze in mid-November.