lake trout fishing spring the ice comes off sandybeach lake around may 7th and we start lake trout fishing at our ontario fishing lodge the third saturday in may lake trout like the water temperature to be 52 degrees or colder therefore lake trout can feed all the way up to the surface until the first of juneduring the last two weeks of may an angler can troll a lure just under the surface of the water and catch lake troutake trout fishing spring the ice comes off sandybeach lake around may 7th and we start lake trout fishing at our ontario fishing lodge the third saturday in may lake trout like the water temperature to be 52 degrees or colder therefore lake trout can feed all the way up to the surface until the first of june