I'm 45 miles east of you and at 9000 feet also. My 70 21' has been outside, uncovered 4 winters that I've had it and several more before that with the PO. The snow melts off after most storms, but creates quite an ice jam and snow bank around the wheels. Enough to lock it in and be a problem when I take my annual "thawout trip" to AZ in late April. Call me at 418-LOCK if you have any questions.