Last night I spent the night near Lizard Head Pass, just under 10,000ft. It was one of the coldest nights so far, and I woke to some frost on the ground. I guess it is getting colder, so I had better get moving.
Fortunately I'll be heading through the Utah desert soon, so at least the days will be warm, and I'll be at a lower elevation, so that is also not a problem.
Due to the lack of trees in the upcoming areas, I have also had my tent mailed out to me, since I normally use a hammock. This will also help with the warmth issue, since tents usually sleep 10 degrees warmer, while hammocks are usually 10 degrees colder. Shouldn't really be much of an issue, but I'll have to wait and see.