In line with trends observed in other Spanish and Romance-speaking regions, the morphological future tense MF (cantaré) is declining in the Castellón speech community (Spain) in favor of the periphrastic variant PF (voy a cantar) for the expression of future events. The multivariate analysis shows the relevance of some linguistic factors in this process, mainly the degree of proximity of the act of speech, the sentence and epistemic modality, the degree of adverbial specification, the class of verbs and, to a lesser extent, the semantic category of the subject (agency), and the types of clause and text. All in all, MF still enjoys a substantial vitality in this Spanish region unknown in other Hispanic areas and that can be related to a convergence process with Catalan, the other language of the region which shares a single variant for expressing the future, namely, the morphological form. Some additional data obtained from 191 interviews of the Sociolinguistic Corpus of Castellón (CSCS) point out the relevance of social factors related with the density of the bilingual population in the speech community, both at the collective and individual levels. The vernacular profile of this MF, favored and retained for the most autochthones elements of society, also clashes with the sociolinguistic profile of this variant in other Spanish-speaking areas where the process of substitution has been described in many cases as a change for below. In sum, language contact can slow down and alter some linguistic change much more advanced in monolingual communities.