The 5-Day Marangu route is the shortest and cheapest option for climbing Kilimanjaro, but it comes with a serious trade-off. Its rapid ascent profile offers very poor acclimatization, leading to a significantly lower success rate and a higher risk of altitude sickness. It is often attempted by tourists on a tight budget or schedule, many of whom unfortunately do not reach the summit. By skipping the crucial acclimatization day at Horombo Hut, climbers make a huge jump in altitude just before the summit attempt. We strongly advise against this itinerary unless you are exceptionally well-acclimatized from a recent climb of a comparable peak (e.g., Mount Meru).