On a largely uninhabited world with geology, climate, biome etc very similar to prehistoric Earth, I have some scenes taking place in a temperate grassland. It's at moderately high altitude, and I had vaguely pegged it as 'Alpine meadow'.
It is now dawning on me that 'Alpine meadow' is a synonym of 'Alpine tundra' - i.e. only occurs at such high altitude that it is basically freezing all year round. And other than that, I have not been able to find any evidence that grassland ever occurs without human intervention in temperate regions, except where it is dry enough to be semi-desert. Other than that, it is looking like all fertile/habitable temperate land, without exception, is always covered in trees.
What's the least unrealistic way to get some grassland in a temperate zone, without human intervention, and without compromising the habitability of the area? i.e. it's got to be reasonably described as 'lush meadow' not 'desolate wasteland'.