We report ¹⁹F NMR studies at 282 MHz on the single crystalline fast ionic conductor LaF₃ from 130 to 490 K. From our high resolution data and from a comparison with computer simulated dipolar spectra we are able to identify the signals from different fluorine sublattices, and to analyse their motional behaviour and their chemical shifts as a function of temperature. The ionic diffusion begins above 290 K, but for the F₁ sublattice only. The F₂ and F₃ sublattices are indistinguishable in the NMR experiments, because their chemical shifts differ by less than 15 ppm. These ions remain static or in relatively slow motion until 490 K.