Do the fairy houses stay up all year long?

Yes

The fairy houses used to there at all times , however for the past 2 years , the fairy houses are only at the Oso Creek Park for a limited time.

PS: I just called and the fairy houses were only there until Jan 7th, not sure when they'll be back. @Pritesh the fairy houses are on the sides of the trail. There are many of them and you just have to look for them. They are all about 4-6" high.

What fairy houses are you talking about? I think we totally missed them. ☹