Bear Lake is so large and deep that it takes quite a long time for the water to cool off from the summer months. To freeze, it needs to go through a fog cycle with very cold temps, days of no wind, and then snow to form ice crystals.
January is typically when Bear Lake freezes. Depending on who you ask, the lake freezes about 3 of every 5 years. The ice has been known to freeze as much as 3 feet deep. Ice fishing is popular at Bear Lake and many are hoping the lake will soon freeze. For me I hope it doesn’t, as an iced lake makes for colder days ahead. But the ice is fascinating and fun to explore.