Functionally closed despite official open status. Plan for January-March closure ahead. April reopening is your next reliable Rinjani window.
Mount Rinjani is technically open in December but with high weather risk. Heavy rainy season conditions, frequent trek cancellations, and most reputable operators advising against attempts. Officially closes January 1. December is functionally the start of closure for most travelers — plan for April reopening instead.
# Mount Rinjani in December: The Risky Window
December is Mount Rinjani's strange middle ground — technically open according to national park rules, but functionally unavailable for most travelers due to heavy rainy season conditions, high cancellation rates, and most reputable operators discouraging attempts. December is the last month before the official January-March closure period.
Three factors make December Rinjani trekking impractical for most travelers:
1. Weather conditions:
2. Operator behavior:
3. Holiday tourist priorities:
If you book a December Rinjani trek with a reputable operator, expect:
For travelers with tight schedules, December cancellations can wreck trip plans. The risk isn't worth it for most.
A small subset of December attempts succeed:
If you specifically want a December attempt, book the first half of the month (slightly drier) and accept the high failure risk.
December 22-January 2 is Christmas/New Year peak tourism period in Lombok generally, but Rinjani trekking is essentially unavailable during this window. Most travelers visiting Lombok during the holiday week focus on:
Rinjani treks during this window are nearly impossible to book and rarely successful when attempted.
For travelers in Lombok during December who hoped for Rinjani:
Workable activities:
Skip these:
Lombok December has split pricing:
For Rinjani specifically, if you do find an operator running early December treks:
For travelers committed to Rinjani trekking, accept that December is functionally closed and plan for the April reopening:
April-May trip planning:
This is the right answer for 95% of travelers who initially considered December trekking.
December is the worst risk-reward Rinjani month. Conditions are bad enough that most attempts fail, but the mountain isn't officially closed yet so booking platforms still show availability. Travelers who don't understand the practical reality book December trips and end up with cancelled treks.
If you've already booked December, hope for early-month luck. If you're considering December, choose May or September instead.
December Rinjani attempts have 50%+ weather cancellation rates even with reputable operators. The risk-reward is poor. If your December trip absolutely must include Rinjani trekking, book multiple buffer days to allow for cancelled attempts. For most travelers, accept that December is functionally closed for Rinjani and plan trip activities elsewhere on Lombok.