The Marangu Route is the busiest of all the routes on Kilimanjaro, especially from January-March and June-September. It is less busy during other months - especially the rainy season - when it is more comfortable to climb Marangu because of the sleeping huts. A climb during the rainy season has its advantages: everything is lush green and the views are truly magnetizing. If you are considering climbing from March-June, Marangu may be your best option.