Blue Heart Kayaking offers a shorter route from its private launch at 4821 N 1115 E in Buhl. Blue Heart Springs has built its reputation on color, and this is the moment when that reputation starts making perfect sense. Blue Heart Springs stays near 58 degrees year-round, which feels much colder than its tropical color suggests. Choose A Weekday If You Want The Quiet VersionAugust warmth brings Blue Heart Springs its busiest stretch. Blue Heart Springs has become one of southern Idaho’s better-known paddling destinations, and plenty of people have the same idea.