There are regular departures on these treks from May to September, and private depar- tures can be organized at any time of year. In the wettest months (from December to April), trails can be slippery and campsites muddy, and views are often obscured behind a thick bank of rolling clouds. The best trek- king months are June to August; the high jungle Vilcabamba trek is not recommended outside these months. Temperatures can drop below freezing year-round on all the other, higher-altitude treks, and it occasionally rains even during the dry season (late May to early September).