The best time to visit Kilimanjaro National Park for trekking and mountaineering is during the dry season, from June to October. This period offers the best weather conditions for hiking, with clear skies, less rainfall, and cooler temperatures. It’s the ideal time for those looking to summit the mountain or enjoy shorter treks at lower altitudes. The wet season, from March to May, brings more rainfall, which can make trekking difficult, especially on the higher routes.