High altitude= high blood sugar?

We are vacationing in Colorado and my son who is 13 and a type 1 blood sugar has been high. We were wondering if any one else has had high blood sugar in high altitude places?we have been counting carbs carefully and doing the normal stuff we do to keep it in range. The change in altitude is the only thing that we have been unable to change.

There is some evidence that high altitudes do affect bgs, making them go higher. This articlesays try to increase the altitude slowly (which I guess is practical if you're hiking).

plus just the stress of being away from home and schedule can send your bgs higher, even if you're having fun!

Thanks for the information. It really helps.