Evidence of phonological awareness levels usually comes from English-speaking children. The evidence in Spanish is scarce. The present study examined the phonological awareness of syllables, onsets--rimes, and phonemes, extending the Treiman and Zukowski (1991) results to preliterate and literate Spanish-speaking children. The sample comprised preschoolers, kindergarteners and first-graders. Children found syllables easier than onset--rime units, and onset--rime units easier than phoneme units (Experiments 1 and 2). Preliterate children found ending units easier than beginning units. However, literate children were best at initial linguistic units, particularly initial syllables. Results on the phonological awareness task and on the masked priming lexical decision task support that the phonological awareness development is sensitive to the orthographic units used by children from the time they begin to read (Experiment 3). For all children, initial continuant consonants were easier than stop consonants.