Apart from the overwhelming cases of allopolyploidization, the impact of speciation through homoploid hybridization is becoming more relevant than previously thought. Much less is known, however, about the impact of climate changes as a driven factor of speciation. To investigate these issues, we selected Festuca picoeuropeana, an hypothetical natural hybrid between the diploid species F. eskia and F. gautieri that occurs in two different mountain ranges (Cantabrian Mountains and Pyrenees) separated by more than 400 km. To unravel the outcomes of this mode of speciation and the impact of climate during speciation we used a multidisciplinary approach combining genome size and chromosome counts, data from an extensive nuclear genotypic analysis, plastid sequences and ecological niche models (ENM). Our results show that the same homoploid hybrid was originated independently in the two mountain ranges, being currently isolated from both parents and producing viable seeds. Parental species had the opportunity to contact as early as 21000 years ago although niche divergence occurs nowadays as result of a climate-driven shift. A high degree of niche divergence was observed between the hybrid and its parents and no recent introgression or backcrossed hybrids were detected, supporting the current presence of reproductive isolation barriers between these species. ; Financial support was provided by the Spanish projects PI097/08 from the Aragón Government, GA-LC-012/2008 from the Aragón Government-La Caixa, 059/2009 from the Ministry of Environment (National Parks division) and a European Union ESF exchange grant (FroSpects 3142). IM received funding from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA grant agreement PIOF-GA-2011-301257. DD was supported by the Portuguese Foundation for Science and Technology (SFRH/BPD/100384/2014). IM, MLLH and PC benefitted from the Bioflora grant project cofunded by the Aragón government and the European Social Fund. JGS-M was supported by two consecutive Aragón Government "Araid" and the Spanish Ministry of Science and Innovation “Ramón y Cajal” postdoctoral contracts. ; Peer reviewed