While Mount Kilimanjaro may be open to climbers all year round, there are specific times of the year that are ideal for trekking and some periods when the terrain is downright dangerous. The best time to trek up Mount Kilimanjaro falls between the months of January and the first week of March while the June to October period is also considered perfect in terms of weather. The only downside to choosing these popular times of the year to hike up the mountain is that there's likely to be a lot of climbers; therefore, there can be traffic on all the routes leading up to the summit. Do not plan a trip to Mount Kilimanjaro in the rainy season from late March to May as the poor visibility and slippery surfaces can make the climbing experience a depressing one.