This article explores multispecies climate fiction as a mode of inquiry that speculates-with other-than-humans. To explore cli-fi’s potential in research, I position speculative fiction in the field of research-creation, a praxis that combines artistic exploration with scholarly inquiry. Adopting a research-creation approach, I wrote the multispecies cli-fi story Canopy of the Hidden Alley. The story emerged from the Multispecies City Lab project, a participatory research project that invited participants to imagine multispecies life in urban areas affected by climate change. I engaged creatively with the research findings of the Multispecies City Lab project, using participants’ imaginaries as a proposition to write the cli-fi story. In this article, the story Canopy of the Hidden Alley is presented alongside methodological reflections on speculative fiction and research-creation, as well as theoretical conceptualizations of what it means to speculate-with other-than-humans in climate fiction. This article discusses the potentiality of speculative fiction as a form of research-creation, demonstrating how creative writing enabled deeper engagement with issues of identity and positionality, social and relational hierarchies and the interplay of multiple temporalities, which guided toward new understandings of multispecies entanglements in the context of climate change and speculative climate futures.