A Nisyros day trip from Kos crosses the sea to a round volcanic island, where a bus drives down into the caldera and you walk on the floor of the steaming Stefanos crater. Find other tours in Greece for more days out in the Dodecanese.
This page walks through the ports, the crossing, the crater, Mandraki village, the timings and what to wear on a Nisyros day trip from Kos.
What does a Nisyros day trip from Kos include?
A Nisyros day trip from Kos adds a boat crossing, a bus ride and a crater walk to one day. The boat leaves Kardamena harbour on Kos, and free time in Mandraki, the island’s capital, rounds out the trip.
Packages differ, so check what yours covers. One operator’s Nisyros day trip from Kos lists three items. These are the hotel transfer to Kardamena, the return ferry and the bus to the volcano. A second listing adds a live tour leader who speaks English and German.
A Nisyros day trip from Kos does not have to be a full package. One local company sells the return boat from Kardamena and offers a choice on arrival. You can walk around Mandraki or join its bus tour to the crater.
Two listings say you pay the crater entry fee at the site. One of them adds that lunch in Mandraki is at your own expense. Read your voucher to see which items your ticket covers.
Three more facts help you compare each Nisyros day trip from Kos.
- One operator runs its trip from April to October.
- Two listings allow free cancellation up to 24 hours ahead, with a full refund.
- One listing says the trip can move to the next day when the weather is unsuitable.
Which Kos ports do the boats leave from, and how long is the crossing?
The boats for a Nisyros day trip from Kos leave from Kardamena harbour, on the south coast of the island. Listings quote between 45 minutes and one hour for the crossing to Nisyros.
Kardamena is a small town about halfway along the south coast of Kos. It lies 7 km from Kos Island International Airport. Every tour listing we checked names its harbour as the start of the Nisyros day trip from Kos.
One operator offers transfers from every hotel on the island. The bus drives to Kardamena, where the boat waits. One listing names six pick-up areas: Psalidi, Kos Town, Tigaki, Marmari, Mastichari and Kardamena.
One operator runs a fast boat with two decks, with seats on the lower and upper deck. It puts the crossing at 45 minutes. Three other listings say about one hour. Allow up to an hour at sea on a Nisyros day trip from Kos.
The same operator says the ride varies with the weather and can be choppy at times. Sea conditions are part of any Nisyros day trip from Kos, so treat the crossing time as an estimate.
Kos has three ports: Chora, Kardamaina and Mastichari. Chora, the main port, sits on the northeast coast and serves the majority of ferry routes from the island. Scheduled ferries from Kos to Nisyros take 50 minutes to 1 hour 30 minutes, depending on the company and vessel.
The distance between Kos and Nisyros is about 16 nautical miles, or 30 km. Nisyros lies between Kos and Tilos in the Dodecanese.
What happens when the boat reaches Mandraki port?
On a Nisyros day trip from Kos, the boat docks at Mandraki, the main port, on the north-west coast. The group then takes a bus for a short drive to the volcano in the middle of the island.
In summer, hundreds of day visitors make the Nisyros day trip from Kos. They arrive on multiple boats each morning. Mandraki is the capital as well as the port, so the quay is where the day on land begins.
The order of the day depends on the operator. One itinerary sends the group to the Stefanos crater by bus first and leaves free time in Mandraki for later. That tour lists bus transport to and from the crater among its inclusions.
Another operator lets you choose on arrival. You can walk round Mandraki, within walking distance of the port, or take the bus tour to the volcano. The free time in the village follows the volcano tour. Check the order before you book a Nisyros day trip from Kos.
Dodekanisos Seaways is a ferry company in the Dodecanese. It says visitors can take the local bus to the crater and walk down independently. It calls the bus from Mandraki port to the crater a separate short journey. Its advice is to ask at the port when you arrive.
For your own Nisyros day trip from Kos, car and motorbike hire is based at the main port. The island also has an occasional local bus, and in summer visitors can use it.
How does the bus climb into the caldera?
On a Nisyros day trip from Kos, the bus climbs a paved road from Mandraki over the crater rim. It then drops down the inner slope into the caldera. Visitor reviews put the ride at 20 to 25 minutes.
Mandraki lies on the north-west coast, while the volcano sits in the middle of the island. The paved road also links Mandraki with the south coast. The whole island has only nine road junctions outside the villages, and a signpost stands at every one.
Operators describe the transfer in plain terms on a Nisyros day trip from Kos. One calls it a short drive to the volcano. Another lists a scenic route into terraced hills, then a descent into the valley. One operator adds a panoramic stop to view the crater before the walk in.
Dodekanisos Seaways gives the same picture. It describes a short bus ride from the port up into the caldera. Then you walk down to the crater floor.
The bus stops near the main crater, so the walk is short. The road ends at a barrier, where visitors pay to enter. On a Nisyros day trip from Kos, a secured footpath leads from the barrier to the rim of Stefanos. Stefanos is the largest crater.
Visitors on a Nisyros day trip from Kos find a small snack bar and toilets at the site. After the visit, the bus returns the group to Mandraki.
What is it like inside the Stefanos crater?
The Stefanos crater is a hollow about 300 metres across and 25 metres deep, where steam hisses from hot ground. A Nisyros day trip from Kos lets you walk down onto its floor.
Visitors on a Nisyros day trip from Kos follow narrow, steep paths down to the crater floor. One visitor timed the walk at seven minutes down and seven minutes back up. The hollow is oval rather than round, and a smaller crater called little Stefanos lies next to it.
The floor looks golden yellow, because sulphur crystals form on it. The air smells of rotten eggs, which comes from hydrogen sulphide gas. The yellow crust crackles underfoot, and puffs of steam hiss around you. Hot springs, boiling mud pools and gas vents give the crater the look of a moonscape.
Take the heat seriously on a Nisyros day trip from Kos. The ground can melt rubber-soled shoes, and vents expel steam at 212 degrees Fahrenheit. A welcome sign warns that the gases and fluids are scorching and corrosive, so do not touch them.
On a Nisyros day trip from Kos you walk in one of the only active volcanic craters in the world. It is also one of the largest hydrothermal craters anywhere. Calm moments can end fast, because a vent can suddenly become active. One visitor reports toilets and a cafe at the site.
Why is the ground hot, and is the volcano still active?
The ground is hot because Nisyros is an active volcano that is not erupting. A Nisyros day trip from Kos visits the craters, where fumaroles release hot gas and steam.
Rain and sea water seep down and meet molten rock under the island. The water turns to steam at 400 to 500 degrees Celsius. When the steam pressure beats the weight of the rock above, it throws the rock into the air. This is a hydrothermal explosion, and it formed the craters.
Nisyros is a stratovolcano with a caldera 3 to 4 kilometres wide. A Nisyros day trip from Kos reaches the eastern end of the Hellenic arc, the volcano line that includes Santorini. The volcanic complex includes the seafloor between Nisyros and Kos.
Is the volcano on a Nisyros day trip from Kos still active? Yes, but it is not erupting. It has had four historical eruptions, and almost all were driven by steam. The latest was a steam explosion in the late 19th century. Two small ash eruptions came earlier in the same century. Earthquakes are frequent.
Thousands of people visit the island each year, and scientists watch it closely. Seismic unrest in the late 1990s led an international team to start monitoring. Today the island is monitored for earthquakes and for thermal and chemical changes. A Nisyros day trip from Kos is a visit to a volcano that is under watch.
What can you see in Mandraki village?
A Nisyros day trip from Kos gives free time in Mandraki, the capital and harbour of the island. The village has painted houses, pebbled squares, a castle of the Knights of St John and two museums.
Operators set aside free time to walk the lanes of Mandraki on a Nisyros day trip from Kos. The lanes are narrow, and the houses have two floors and wooden balconies. They are built of volcanic rock and insulated with pumice stone. The squares have pebbled floors. Delfinion, the square of the Dolphins, is the typical example.
The square of the old lady, Plateia tis Ilikiomenis, is the meeting point of visitors and residents. A big ficus tree shades it, and one operator suggests a coffee there. On a Nisyros day trip from Kos, you can taste soumada, a local drink made from almonds, at the square.
Two museums add history. The Archaeological Museum stands next to Heroes Square and holds finds from the necropolis of the ancient city. The Folklore Museum fills an 18th-century mansion on the road to the monastery. Both are in the village where a Nisyros day trip from Kos spends its free time.
The Knights of St John built the castle in the early 14th century, high on a rock. The coats of arms of the Great Magistrates mark its walls. Ancient walls from the fifth century BC lie near Mandraki and belong to the acropolis of the island. One operator lists three hours in Mandraki on a Nisyros day trip from Kos.
Why do visitors climb to the Panagia Spiliani monastery?
Visitors climb to Panagia Spiliani on a Nisyros day trip from Kos for its miraculous icon and its view. The white monastery stands on a steep volcanic rock beside the castle, and its church sits inside a cave.
The name Spiliani means “of the cave”. According to tradition, a farmer found a small icon of the Virgin Mary in the cave. He carried it to the church of Panagia Potamitissa. The icon vanished and turned up in the cave again. It happened again and again, so the islanders built a church inside the cave.
A Nisyros day trip from Kos that includes this stop climbs to a cave with two churches. The north church honours the Assumption of the Virgin, and the south church honours Saint Charalambos. The silver icon of the Virgin matches the small wooden icon found in the cave.
The monastery celebrates the Virgin on 15 August, and pilgrims arrive from across the Dodecanese. Ships pass under the monastery before they dock and whistle, and its bells ring back. A Nisyros day trip from Kos on that day meets a big festival with food, songs and dances.
Steps lead up to the cave. One island site counts 130 steps, and another counts 270. At the top, one operator promises a panoramic view above Mandraki. Save your energy for the climb on a Nisyros day trip from Kos. The monastery is the highest spot in the village.
Do the tours stop at Nikia or Emporios on the crater rim?
Not every tour stops at Nikia, a village on the caldera rim, and the listings leave out Emporios. Read the stop list before you book a Nisyros day trip from Kos. The basic route runs from the crater to Mandraki.
The basic shared tours for a Nisyros day trip from Kos list a bus to the volcano. They add free time in Mandraki and do not name Nikia. The route with the village stop is its own tour. One example is a seven-hour cruise from Kardamena, titled Nisyros Cruise, Volcano & Nikia Village.
One afternoon tour with the stop reaches Mandraki at 13:00. At 15:30 a bus takes the group to Nikia for a 45-minute volcano visit. The listing warns that times and stops can vary slightly on the day. On this Nisyros day trip from Kos, lunch in Mandraki comes before the rim.
The same listing mentions cobbled lanes and a spot near the crater’s edge where you feel the heat. Nikia also has one square with two restaurants and a viewpoint down into the crater valley. An old school in the village holds the volcano museum, with a panoramic view of the volcano.
Emporios is smaller, with 27 residents. A volcano observatory stands there, fed around the clock with data from active volcanoes. A tavern has a view over the crater valley. Tour listings for a Nisyros day trip from Kos do not name it. A visit means a taxi, a hire car or the occasional bus.
What time does the day start, and when do you get back to Kos?
Listings run from 6 to 10 hours. One nine-hour Nisyros day trip from Kos departs at 8:00 and returns to Kos at 17:30. Hotel drop-off falls between 17:00 and 18:00.
One operator’s boat times change with the day of the week. Its boat leaves Kardamena Harbour at 9:30, or at 10:30 on Sundays. The return sails from Mandraki at 15:30 on Monday, Tuesday, Thursday, Friday and Saturday, and at 17:30 on Sunday. A Sunday Nisyros day trip from Kos starts one hour later and ends two hours later.
With transfers, hotel pick-up comes before the boat. The voucher gives the exact pick-up time and meeting point, and a bus then drives to Kardamena harbour. One afternoon tour without transfers asks you to meet the captain at 11:30 at Kardamena Bridge. A Nisyros day trip from Kos with transfers therefore starts earlier than the boat’s own time.
The afternoon tour starts late. Its boat sails at 12:00. The group docks back at Kardamena at 19:30, before an optional transfer to the hotel. Plan a late dinner after a Nisyros day trip from Kos on this schedule.
One operator lists the excursion from April to October. Check your date before you plan a Nisyros day trip from Kos. One seven-hour listing names 5 hours to explore in its title, so the time ashore is easy to compare.
What do you wear and bring for the crater floor?
Wear closed shoes with a high sole and good grip. Bring a hat, sunscreen, sunglasses and at least one litre of water for a Nisyros day trip from Kos. The crater floor is uneven rock, and it has no shade.
One listing strongly urges closed shoes with a high sole for anyone who walks inside the crater. Another operator names trainers or closed-toe shoes and rules out sandals and flip-flops because of the uneven ground. A travel blog says solid shoes help you avoid burns and sore feet on the crater floor.
Sun cover matters on a Nisyros day trip from Kos. Dodekanisos Seaways says the crater has no shade and asks for sunscreen and a hat. It also asks for water, with more of it in summer. Another listing adds sunglasses and a camera.
Pack a light layer for the boat. One operator suggests a light jacket or sweater because the weather can change during the day. Nisyros can see etesian winds between June and August.
Carry cash as well. Dodekanisos Seaways lists cash for lunch and the crater entrance fee. A Kos operator says the fee is paid at the volcano. One traveller took snacks instead of a sit-down lunch and had time to walk around Mandraki. Charge your phone before a Nisyros day trip from Kos, too.
What else do travellers ask about a Nisyros day trip from Kos?
Is a Nisyros day trip from Kos suitable for children?
One operator calls the tour suitable for children and says it teaches them about the crater. Another listing says the crater is quite steep. It advises against young children, expectant mothers and anyone with health problems walking to the bottom. Dodekanisos Seaways asks you to keep children close to the hot vents.
Can you join a Nisyros day trip from Kos with limited mobility?
Two listings mark the tour as not suitable for wheelchair users or people with mobility impairments. A third seller says only certain areas are accessible. A fourth operator lists moderate walking for its tour.
What happens to a Nisyros day trip from Kos in bad weather?
One listing says the tour can be rescheduled for the following day when conditions are not suitable. Another seller offers a new date or a full refund after a weather cancellation. A third operator says the crossing can turn choppy at times, and that its boats are equipped to handle it.
How late can you book or cancel a Nisyros day trip from Kos?
One seller takes bookings up to 1 day ahead while seats remain. Four listings allow free cancellation up to 24 hours before the start. Check the cancellation line of your own listing before you pay.
Which months suit a Nisyros day trip from Kos?
One Kos operator lists availability from April to October. Another says Nisyros can be visited all year. Dodekanisos Seaways says the crater is open year-round. It calls late spring, June and September warm without the full heat of July and August.