An unexpected find on the shores of Utah Lake on the outskirts of Salt Lake City, Saratoga Hot Springs consists of a single shallow pool into which several mineral springs vent. The water is a bit murkier than most spring pools, but still hot and refreshing in any weather.
If you go:
Open year-round. Free admission. Address given is for Inlet Park, which is the closest place to park. The springs are just a short hike away. The parking lot is small, but there is another lot on the other side of the park with overflow parking.
Links:

6800 North Saratoga Road
Saratoga Springs, Utah 84045 USA
Mailing address:
City Of Saratoga Springs
1307 N Commerce Drive Suite 200
Saratoga Springs, UT 84045 USA
Phone Numbers:
City Of Saratoga Springs
+1 (801) 766-9793
+1 (801) 766-9793