The only place you are likely to be at risk of rockfall on Kilimanjaro is on the Western Breach. The danger really only applies if you plan to climb through the Western Breach. It is by far the most challenging route variation on Kilimanjaro. The danger comes from the melting glaciers above the Western Breach. When the glaciers melt, they release rocks. However, there are plenty of other routes that do not include the Western Breach, so this problem can easily be avoided.
The best course of action to avoid the risk of rockfall when climbing Kilimanjaro is to choose a route that does not take you through the Western Breach, such as any of our most recommended routes.