Trekking to the mountain is an activity that really depends on several factors such as weather, season, volcanic activity, visitor quotas and so on. Choosing a time to climb a mountain can be challenging, we need to do some deep research before deciding on a date to go on a scenic hike. Mountain Rinjani is a mountain that need multi days to do the trek, the trekking activity at the mountain also depends on some factors such as season. Do not waste your time to plan to visit Rinjani on January till end March, the park is closed, this is the annual closure due to rainy season and mountain recovery period. If any of organizer confirming your trekking package to mountain Rinjani for January-March, definitely that is illegal activity. Then when is the best time to visit Rinjani? Consider the following months with their positive and negative aspects: 1. April - May Normally, the first day of the opening after rainy season is April 1st. April may one of the best trekking season because of the landscape still green, Not dusty, not too hot and still not too many visitor. Should be many discount available. Negative: maybe still light-medium rain especially afternoon and will be slippery in few spot. The are potential of the cloud block the view. 2. June - September At those months, the mountain will be dry, less chance to get rain so big chance to get the clear view of the landscape. You need to book and secure your trekking pass to the mountain as soon as possible, will be many visitor and maybe crowded at the park. June - August is the high season, less chance to get discount. 3. October - December Low season discount normally offering here, less people but high chance to get rain, prepare your self with Rain coat and good shoes. Even lot of rain, but October - December still safe for trekking.