Ijen Crater: Blue Fire, Access and Safety
Plan a visit to Ijen: blue fire, volcanic gas risks, the 3 km climb from Paltuding, online tickets and how to get there from Bali.
Contents
Kawah Ijen is an active volcano in East Java with the most acidic crater lake in the world and a night-time spectacle: blue flames at the edge of the lake. The climb starts in the dark, the air smells of sulphur, and by first light the lake turns turquoise. A visit depends on the day's conditions, so check access before you book.
Blue fire and the crater lake
The blue fire comes from sulphur reacting with oxygen at temperatures above 360°C. It is not blue lava, and you only see it at night, because sunlight drowns out the flames.[1] Indonesia Travel puts the best chance of seeing it around 05:00.[2]
Things to Do
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GetYourGuide partner offers. GoAsia may earn a commission if you book through these offers. Check whether tickets or transfers are included, and follow the attraction's official booking and admission rules.
Access and volcanic hazards
Ijen releases high concentrations of volcanic gas around the crater and can have sudden phreatic eruptions, which are bursts of gas from the crater lake that come without visible warning. Indonesia's geological agency PVMBG raised the volcano to Level II (Alert) in July 2024 and told visitors to stay away from the rim and the crater floor.[3] Check the current status on PVMBG's MAGMA site and follow the rangers if they close the descent.
Kawah Ijen nature park was closed from 4 September 2026 after a forest fire and reopened on 28 September 2026. Tickets are booked online at ayoketamannasional.kehutanan.go.id, and visitors must follow the park's rules and carry a torch, a mask and warm clothing.[4]
A dust or filter mask does not make the crater safe. It cannot protect you in dense gas, so move away from the gas cloud and do not go into closed-off areas, even with a guide or a rented mask.
The route is an uphill mountain walk. It is about 3 km from the Paltuding post to the crater rim, and the same distance back. The climbing schedule starts at 01:00, and in restriction periods at 03:00.[2] Wear sturdy shoes and layers, carry water and a headlamp, and plan the descent in daylight, when the lake colour is at its best.
Tickets and requirements
Book your ticket online in advance. The current tariff for your visitor category is shown on the booking page. Ask your operator whether the price of transport is per person or per vehicle and what is refunded if access closes. If a health certificate is required on your date, ask the park or your operator before you travel.
Plan your journey
From Bali, take the ferry from Gilimanuk to Ketapang in Banyuwangi, East Java, then continue by road to Paltuding, the start of the trek.[2] Leave time for queues at the ferry port and for the road transfer; the crossing is only part of the journey.
Ijen and Mount Bromo are separate volcanoes with separate access rules, so combine them only when both are open on your dates and the itinerary leaves time for transfers and rest. Ask the operator what happens if one of them closes.
Sources and background
Numbers in the text such as [1] refer to these sources.
- [1] UNESCO: Ijen UNESCO Global Geopark: blue flames and crater lake. Retrieved November 5, 2026.
- [2] Indonesia Travel / Ministry of Tourism: Ijen Crater: Paltuding hiking route description, not a current opening notice. Retrieved November 5, 2026.
- [3] Kementerian Energi dan Sumber Daya Mineral / PVMBG: Historical Ijen gas and access warning, 12 July 2024. Retrieved November 5, 2026.
- [4] ANTARA News Jawa Timur: Kawah Ijen dibuka kembali pada 28 September pascakebakaran. Retrieved November 5, 2026.
- [5] CDC / National Institute for Occupational Safety and Health: A Guide to Air-Purifying Respirators: oxygen and protection limits. Retrieved October 4, 2026.
- [6] CDC / Agency for Toxic Substances and Disease Registry: Archived Medical Management Guidelines for Sulfur Dioxide: nonflammability. Retrieved October 4, 2026.
- [7] PT ASDP Indonesia Ferry (Persero): Gilimanuk and Ketapang ferry connection and operating conditions, 1 September 2026. Retrieved October 4, 2026.
Frequently Asked Questions
Sulphur reacting with oxygen at temperatures above 360°C. It is not blue lava, and you can only see it at night, because sunlight hides the flames.
Tickets are booked online at ayoketamannasional.kehutanan.go.id, where the current tariff for your visitor category is shown. Ask your operator whether transport is priced per person or per vehicle.
Take the ferry from Gilimanuk to Ketapang in Banyuwangi, East Java, then continue by road to Paltuding, where the trek starts. Leave time for queues and the road transfer.
Bring a mask, a torch and warm clothing, as the park requires. A mask does not make the crater safe in dense gas: move away from the gas cloud and do not enter closed areas.
The climbing schedule starts at 01:00 (03:00 in restriction periods), and the blue flames usually show around 05:00. Access to the crater floor can change from day to day, so a sighting is never guaranteed.
It is an uphill mountain walk of about 3 km from Paltuding to the crater rim, and the same distance back. Wear sturdy shoes and warm layers and carry water and a headlamp.
If one is required on your date, the park or your operator will tell you. Ask before you travel, and do not rely on getting one on arrival.
Yes, when both are open on your dates and the itinerary leaves time for transfers and rest. They are separate volcanoes with separate access rules.
