Booking a Rinjani trek should be done as early as possible, especially because the national park uses a strict daily permit quota. During the busy months of July, August, and September, permits often sell out long before the trekking date. Anyone planning to visit during this peak period should book at least one month in advance, and earlier is even better. Many travelers are surprised to arrive in Lombok and find that every permit for their preferred days is already gone.
During the shoulder season months of April, May, June, and October, permits are still in high demand, although the competition is not as intense as in mid-summer. Booking two to three weeks in advance is usually enough, but waiting until the last minute still carries a risk, especially for summit routes that are more popular than crater rim treks.
In the low season just before the mountain closes, such as November and early December, demand is lower but permits can still fill quickly on weekends or holiday periods. Even in these months, securing your trek a week or more in advance is recommended to avoid disappointment.
Because permits can only be issued through licensed trekking organizers, booking early ensures your place is guaranteed and prevents the common situation of arriving too late. Early booking also helps coordinate guides, porters, equipment, and transportation. The safest approach is simple: reserve your trek as soon as you know your travel dates to make sure you do not miss your chance to climb Mount Rinjani.
