Dan, yes certainly you are right about the dry weather here compared to what you experience in Oregon. And if I recall Oregon does not allow for studded tires. Right?
Not that Colorado is easy if you head up into the mountains. It is only that we have had to adjust a bit now in Bend. Black ice. Yuck.
You can use studded tires in Oregon but not until November and they need to be off by April. Most don’t use them. To be honest, we don’t get a lot of snow in Bend but there can be a lot of wet, heavy snow up in the Cascades. And, therefore, lots of ice!