What's the best time of year to go?

I would go in the late fall to winter. They have outdoor heaters to keep you warm when you get out of the hot baths. They also have a sauna.

I went there in summer, but still comfortable. The scenery from the bath zone was truly gorgeous!

October to january

I go in October but it's still pretty warm at that time. Definitely would go when it's cooler

I love to go in winter. The hot water keeps you warm, and it's a great feeling with cold on your face and warm everywhere else.