Non-coding regions play a pivotal role in plant stress responses, influencing gene regulation at epigenetic, transcriptional, and post-transcriptional levels. This chapter explores the evolutionary dynamics of stress-responsive non-coding RNAs (ncRNAs), including miRNAs, siRNAs, lncRNAs, and circRNAs, highlighting their origins, functions, and regulatory mechanisms. The chapter also discusses differences between conserved and lineage-specific regulatory sequences, emphasizing their significance in species adaptation. Recent advancements in high-throughput sequencing and functional genomics have revealed complex ncRNA-mediated regulatory networks that govern stress tolerance. Understanding these mechanisms offers potential applications in crop improvement, enhancing resilience to climate-induced stresses.