Playing in natural environments is a popular activity for young children. In previous years, studies have shown benefits of playing in natural environment for children's motor development and attention restoration. In this study, we explored the relation between playing in natural environments and children's language use. A total of N = 18 children (4-7 years) from three Dutch primary schools participated. To measure children's language use during outdoor play, we recorded their utterances for ten minutes while playing in a non-nature-based playground and a nature-based playground. Audio tapes were transcribed and coded using a coding scheme focusing on communicative functions. Findings indicated that children used more language and more complex language while playing in the nature-based playground. Additionally, four themes were identified: (1) Children used language to refer to their play situation; (2) Children used language to refer to the elements of their physical play environment; (3) Compared to the non-nature-based playground, children talked more about the objects of the nature-based playground; and (4) Children talked more about science and math concepts. Play in the nature-based playground appeared to be a richer conversational setting for language use than the non-nature-based playground, with a potential to scaffold and guide language use.