We present a NMR investigation of ⁶ Li _7−x H _x La ₃ Zr ₂ O ₁₂ (0 ≤ x ≤ 5) garnets to study the distribution of Li ions. The facile H ⁺ /Li ⁺ exchange alters the relative population of Li sites, and allows the identification of 3 different bands ascribed to Li in different environments. Variable temperature measurements indicated the presence of dynamic processes between octahedral and tetrahedral Li sites.