Congrats for moving, you won't regret it! Your UTH will be fine up here, it does get a lot colder here in the winter than it does in Southern California but the outside temps are gonna depend a LOT on where in Oregon you are moving to - the elevation and whether you are east or west of the cascades is going to make a big difference in how cold it gets. in Eugene it only snows once or twice a year but we did get a dry freeze in Dec. with a week or so where the daytime highs were like 26. Brrr! But as said by Kelsie they will be fine inside a heated house.