How late in the season can you fish for trout? The way I love trout fishing I go all the way through the winter. However, I’m very careful to select spots where I know there are springs to warm the stream. For example, as I write this in the office of my fly shop I can look out the window at Big Stoney Creek and know there is a large spring just downstream that pulls the trout and prompts their feeding. To find the spring coming in from the side of the stream just look for bright green weed growth along the bank and in the stream.