This study aims to describe the forms, meanings, functions, implementation, and validity of the cultural values embedded in the Gorontalo ethnic calendar through an anthropolinguistic approach. The Gorontalo ethnic calendar is a traditional knowledge system based on observations of the movement of stars, the Hijri calendar, and the cultural experiences of the Gorontalo people in determining appropriate times for social activities, customary ceremonies, agriculture, fishing, and house construction. This study employed a qualitative method using observation, in-depth interviews, documentation, and the listening and participant observation techniques. The informants consisted of traditional leaders and indigenous astronomy experts from six regencies and municipalities in Gorontalo Province. Data were analyzed through transcription, identification, classification, interpretation, and conclusion drawing. The findings reveal that the Gorontalo ethnic calendar embodies a cultural knowledge system represented through linguistic forms at the phonological, morphological, syntactic, and semantic levels. The names of stars, temporal expressions, and traditional calendrical terms reflect the religious, ecological, social, and philosophical values of the Gorontalo community. The ethnic calendar functions not only as a timekeeping system but also as a guide for decision-making in community life and as a cultural heritage with academic significance, cultural identity, and enduring relevance for preserving local wisdom in the modern era.