Real talk: hiking Rinjani alone isn’t allowed by the national park, and even if it were, it would be a bad idea. The park requires a licensed guide for every trekker, so true solo hiking simply isn’t an option. Some people roll up thinking they can just buy a permit and go, but it doesn’t work that way. The rules exist for good reason.
That said, if you’re traveling alone, Lombok-Indonesia.org has a solid system for this. They place solo trekkers into shared groups with other independent travelers, so you’re never actually on the mountain by yourself. It’s super common, and plenty of friendships have started this way. Some people arrive solo and leave with a whole new crew. If you want more privacy, you can book a private trek, but you’d need at least two people to make the pricing reasonable.
Even beyond the rules, hiking alone on Rinjani would be risky. The terrain is tough, weather shifts fast, and that summit push in the dark over loose scree is disorienting enough with a guide holding a headlamp. In an emergency, having teammates and an experienced guide who knows evacuation routes can make the difference between a manageable situation and a real crisis.
The team handles matching solo travelers to groups seamlessly, so you get the camaraderie without giving up your independence. Honestly, some of the best trekking memories come from the people you meet along the way.
If you’re nervous about joining strangers, don’t be. Everyone on that mountain is there for the same reason, and shared suffering on a volcano has a way of breaking the ice fast.

