Shoulder season in Patagonia brought me to Laguna de los Tres covered in snow, but the trek was still well worth it. This was arguably the hardest hike I did in Patagonia because of the last 1 km and its serious elevation (2,500 ft). I suggest scaling it alone, or else you'll likely end up splitting up with your group unless you have the same endurance. The trail leading up to the high point is really enjoyable and easy; you pass through valleys with condors flying above, over small streams with blue hanging glaciers in view. As you get closer, Cerro Fitz Roy comes into perspective (if not obscured by clouds, as it is on some days), and serves as serious motivation for making it to the top. The whole trek took me only about 6 hours solo, including my taking my time on the way back to photograph, snack, and hang out in the grass and watch the clouds pass over the peaks.