I would guess that Idaho loses out as its mountains are mostly on the drier west side of the Rockies, its highest peaks run in narrow ranges that run north-south and provide little in the way of permanent shade in high elevations that might allow glaciers to form lower than usual. Its highest mountains are also further south, in the driest parts of the state, while wet northern Idaho has mountains that barely get above treeline.
Source on Idaho:https://glaciers.us/glaciers.research.pdx.edu/Glaciers-Idaho.html
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