Idaho

More than 300 natural hot springs dot Idaho’s terrain, but a more concentrated number of 30+ developed hot springs sites feature hot pools of varying temperatures and modern amenities. From Boise to Twin Falls, there loads of options with the most choices in Lava Hot Springs.

On the western edge, drive along the Weiser River to an oasis in the form of hot springs in Cambridge. Those who enjoy ski towns can suit up for a soak near Sun Valley and Brundage Mountain Ski Resort, but note that the Ketchum hot springs is open only in summer and the one near McCall has limited access in winter.

Along Thousand Springs Scenic Byway, Buhl has two hot springs attractions with larger pools, private pools and various lodging options. For a natural hot springs experience head to Donnelly while the town swimming pool in Lava Hot Springs is a mecca for all ages.