Uber's Advanced Technology Center [] is in Pittsburgh. Having grew up about 1.5 hours north of there, that is a good area to test snowy conditions.
[] - http://www.uberatc.com/ (which seems like a unofficial site but I can't find anything else)
[] - http://www.uberatc.com/ (which seems like a unofficial site but I can't find anything else)
Having never lived near the Rockies, I don't know how it compares. They probably are worse though.