Oklahoma's Quiet Biodiversity Hotspot: Ranking Among America's Richest Ecosystems

When you think of biodiversity hotspots in America, Oklahoma probably isn’t the first place that comes to mind. But here’s the thing: the state punches way above its weight when it comes to ecological diversity.

Oklahoma ties with Texas for third place nationally in the number of distinct ecoregions—those small regional ecosystems with their own unique mix of plants and animals. Only Alaska and California rank higher. That’s not a fluke. The state’s 12 Level III ecoregions, which include the High Plains, Cross Timbers, and Ozark Highlands, span three entirely different biomes: temperate grasslands, savannahs and shrublands, temperate conifer forests, and temperate broadleaf forests and mixed forests. In other words, Oklahoma manages to pack an enormous amount of ecological variety into a relatively compact footprint.

What makes this possible? Geography and climate work together like a perfectly matched pair. Oklahoma sits at the intersection of multiple climatic zones, which creates the conditions for radically different ecosystems to coexist. That geographic sweet spot translates directly into biodiversity numbers. According to The Nature Conservancy, Oklahoma ranks No. 16 nationally for overall species diversity with 3,616 species. But the state does even better when you zero in on specific groups: it lands at No. 9 for bird diversity and No. 9 for reptile diversity.

For locals in Lawton and across western Oklahoma, this ecological richness isn’t just an abstract talking point. The landscape around you—from the Wichita Mountains to the prairie grasslands—represents some of the most biodiverse terrain in the country. Understanding that Lawton sits within this larger web of interconnected ecosystems can shift how you see the landscape. What might look like ordinary prairie or scrubland is actually part of a carefully balanced system that supports thousands of species.

The takeaway? Oklahoma’s biodiversity isn’t measured just by the total number of species. It’s the variety of fundamentally different ecosystems coexisting in one state that truly matters. That combination is rarer than you’d think.