Elevation is not a determining factor in where grasslands can grow. Rather, precipitation and fire regime, generally determine where grasslands can grow. Precipiation needs to be high enough to support grasses, however low enough or sporadic enough to prevent trees from growing. A semi-frequent fire regime also prevents trees from growing, whereas grasses can survive fires because they can grow back from the roots.
Grasslands exist in both temperate and tropical climates, and on every continent except Antarctica. Another clue to understanding how elevation does or does not impact the location of grasslands is paleogeography—what was the arrangement of landscapes and ecosystems in the past. Places that are now forest, for example, used to be grasslands, and while the elevation of these locations has not changed dramatically, the precipitation patterns have.
Hope this helps some.
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