The Baetis Nymph, more commonly known as the Blue Wing Olive, appears in rivers throughout North America but the hatches are exceptional in the western United States. Hatches can start as early in the year as January, but usually begin to peak around March or April. If you’re lucky enough to catch a cool, overcast day during these months be ready! Probably good enough to rationalize a sick day, cough cough.
This particular Baetis pattern is one of the easiest I tie. My only critique of this fly is that it isn’t the most durable, mostly due to the fact that it is tied with a plastic bead which can break easily. I carry a stockpile of these flies, both light and dark in color, because it’s easy to go through a bunch of them in a day…which, if I’m on the water, I don’t mind at all!