Frost line depth in El Paso County, TX
How deep the ground freezes in El Paso County, TX
2 in. Dig to 12 in, the 12 in code minimum. Nearest NOAA station: El Paso Intl Ap, 8.5 mi.
Your building department sets the legal frost line depth (IRC Table R301.2(1)); footings must go below it (R403.1.4.1). Call them before you dig.