The opposite of "tarde" in Spanish, which means "late" in English, is "temprano," which means "early" in English. When looking for the opposite of a word, it is helpful to think about the concept or meaning of the word and find a word that is its counterpart. In this case, "tarde" refers to a time period that is later than expected or desired, so the opposite would be a time period that is earlier than expected or desired. Therefore, "temprano" is the opposite or antonym of "tarde."