Fagradalsfjall Volcano Hike: Which Guided Walk to Book
Two operators run the same walk onto the same lava, and they attract completely different people. One puts a working geologist in front of you. The other is staffed by people from Grindavík who were evacuated from their own houses. Both cover roughly 8 km with 300 metres of climbing, both take four to six hours out of Reykjavík, and there is about nine dollars between them.
About the Hike
Roughly 300 metres of climbing, an hour to an hour and a half each way on the trail
The drive out of Reykjavík takes about 50 minutes each way
One operator sends volcanologists, the other sends guides from Grindavík
12 and over on the geologist hike, 2 and over on the small-group hike
Nothing has erupted since August 2025; both operators say so on the booking page
Both cancel at short notice on weather or gas readings, with a full refund
Check Dates and Availability
Live slots for the geologist-led hike from Reykjavík. Summer weekends go first.
Which of the Two to Book
Book the geologist if you want the why
This one is rated 4.8 across 839 travellers, more reviews than any other hike among every Fagradalsfjall volcano tour we compare. The guides are geologists and volcanologists, and several of them research this volcano for a living.
Reviewers keep describing the same thing: maps drawn in the dirt, rock samples stashed along the route ahead of time, analogies pitched at whoever is standing there. One traveller in July wrote that the guide went out of her way to accommodate the varied knowledge starting points of the group, and that nobody was left feeling stupid.
The cost of that depth is a stricter door. Children under 12 cannot come, and the operator names respiratory issues and pregnancy as reasons not to book, because of the gas.
- $157.55 per person, 4.8 from 839 reviews
- Geologist or volcanologist guide, small group
- Headlamp and crampons provided when the season needs them
- Minimum age 12
- Food, drink and hiking gear are yours to bring
Book the locals if you want the human story
The small-group hike carries the higher rating, 4.9 from 591 reviews, and it earns that on a different axis. Every guide is from the Reykjanes area and lived through the eruptions. On the pickup version the van stops in Grindavík first, so you see the cracked roads and the empty houses before you walk on the rock that emptied them.
A traveller from Canada in June described the guide, Oddi, as being from Keflavík and knowing the whole history of the area, then added that the town is now a ghost town. Another asked about the cat. It made it.
Practically, this is the more flexible booking. Children from age 2 are allowed, hiking poles come free, and crampons appear in winter.
- $148.72 per person, 4.9 from 591 reviews
- Guides from Grindavík and the surrounding area
- Hiking poles included, crampons in winter
- Minimum age 2
- Pickup version adds Seltún and Kleifarvatn when the roads allow
The self-drive option nobody mentions
The small-group operator sells a cheaper version where you drive yourself and meet the guide in Grindavík at 10:45. You then follow the guide's car to the volcano car park and pay the parking yourself.
It only works with a rental car, and the mechanics are the same as walking the trails without a tour. Arriving by taxi or shuttle will not do, because you need to follow the guide out to the trailhead and make your own way afterwards. A family from Germany used it this July and said it worked well: they met the guide at a hotel car park and drove on from there.
One thing to weigh before choosing it. Pickup is capped at 7 guests, but the two booking types merge on the trail, so depending on the mix the guided group can reach 13 people per guide.
Both Guided Hikes
Same trail, same rough distance, different guide and different rules at the door.
from $157.55 
from $148.72 The Two Hikes Side by Side
Where the money and the small print actually differ.
What You Actually Walk Across
Rock that was liquid five years ago
The trail climbs out of the car park onto the 2021 flow, which covers 4.8 square kilometres and is the reason the walk exists. Underfoot it turns from gravel to ropey, folded crust that rings hollow in places and cuts a soft shoe to pieces.
Heat still comes out of it. A traveller in June described the thrill of feeling warmth through the cracks in the valleys of lava rock, and a family in April were told their flows were four years old and still hot. Steam rising off a cooling field on a cold morning is the closest thing to an eruption you will see this year.
Moss reads the calendar for you. The 2021 lava has a grey-green fuzz starting on it, the 2023 ground has none, and the boundary between them is a line you can step over.
- The 2021 Geldingadalir flow, 151 million cubic metres of it
- The Meradalir valley filled by the August 2022 fissure
- Crater viewpoints over the whole field
- Steam venting from cracks where the rock has not finished cooling
- The moss line where one eruption stops and the next begins
The Hike, Filmed
A traveller's footage of the geologist-led route, from the car park to the crater viewpoint.
What the Price Covers
Included, and pointedly not included
Both tickets buy the guide and the transport. Neither buys lunch.
The geologist hike adds a headlamp and crampons when conditions call for them, and leaves food, drink, hiking equipment and tips to you. The small-group hike includes the transfer if you pick that option, a dedicated local guide and hiking poles, and excludes food, drink, the self-drive parking fee, travel insurance and tips.
So budget for the parking if you drive yourself, and pack your own lunch either way. There is nothing to buy at the trailhead.
| Geologist hike | Small-group hike | |
|---|---|---|
| Guide | Geologist or volcanologist | Local from the Grindavík area |
| Transport | From Reykjavík, by booking option | Pickup version, or self-drive |
| Gear lent | Headlamp, crampons if needed | Hiking poles, winter crampons |
| Food and drink | Not included | Not included |
| Parking | Covered on the pickup option | You pay it on self-drive |
| Tips | Not included | Optional |
How the Day Runs
-
Morning
Pickup in Reykjavík
Collection from a central bus stop or hotel. Self-drivers instead meet the guide in Grindavík at 10:45 and follow the car out.
-
About 50 min
The drive across the peninsula
Out along Route 42 and Route 427 over older lava fields, with the guide setting up the geology on the way.
-
On arrival
Grindavík and the barriers
On the pickup version, a stop in the town and at the earth barriers built to steer the flows away from it.
-
1 to 1.5 h
The climb to the viewpoint
Up onto the flow and along it, roughly 300 metres of ascent, with frequent stops to look at what the rock is doing.
-
At the top
The crater viewpoint
Time on the rim to look over the 2021 and 2022 fields and photograph the moss boundary.
-
1 to 1.5 h
Back down
The descent is where people slip. Wet lava is slick and the poles earn their keep.
-
Afternoon
Return to Reykjavík
In summer the small-group pickup adds Seltún and Kleifarvatn when the roads are open.
Before You Book
Who should not do this hike
Both operators publish the same warnings, and the reason behind them is gas rather than gradient. Sulphur dioxide seeps out of cooling lava and settles in hollows when the wind drops.
- Not suitable on the geologist hike: children under 12, pregnant travellers, anyone with mobility or respiratory problems
- Not suitable on the small-group hike: children under 2, pregnant travellers, mobility or respiratory problems
- The operator describes the terrain as difficult and rough, and expects hiking experience
- Not allowed on either: high heels, sandals, pets, smoking, large bags, baby carriages
What to bring
Hiking boots decide whether you enjoy the day, and the full packing list for this hike covers the rest. The lava is uneven and sharp-edged, and the descent gets slippery in rain. Reviewers who hiked in July still met constant rain, wind and mist; one from northern Canada was cold in what she considered summer kit.
- Hiking boots with ankle support, worn in
- Waterproof jacket and trousers, warm mid layer
- Hat and gloves, including in July
- Water and food for the whole outing
- Thermal layers if you feel the cold
- A charged phone, plus the Parka app if you are self-driving
The cancellation you should expect
Both operators cancel at short notice for bad weather, road closures or high gas readings, and both refund in full when they do. That is not a hedge in the small print, it is how the peninsula works.
Neither will promise you glowing lava. The geologist operator writes that a volcanic eruption is a natural phenomenon and the activity can change quickly, so the view of hot glowing lava cannot be guaranteed. The small-group operator says the same in plainer words: when there is no visible activity, the focus is the lava fields and the story behind them. As of July 2026 there is no eruption anywhere on Reykjanes.
Where the Trail Starts
Questions About the Hike
How hard is the Fagradalsfjall volcano hike?
Moderate, with the caveat that the surface makes it harder than the numbers suggest. The small-group operator gives the figures as about 8 km round trip with roughly 300 metres of elevation gain and up to 4 hours of walking. The geologist operator calls the terrain difficult and rough and puts the climb at an hour to an hour and a half each way. Groups move at the pace of the slowest walker, and one party this July hiked it with a 70-year-old relative without feeling rushed.
How much is a guided Fagradalsfjall hike?
$148.72 for the small-group hike with local guides and $157.55 for the hike with a geologist, both per person and both including transport from Reykjavík on the pickup option. The self-drive version of the small-group hike costs less but you pay the 1,000 ISK car park fee yourself and need a rental car.
Can children do the volcano hike?
It depends which one you book. The small-group hike accepts children from age 2; the geologist hike sets its minimum at 12 and names gas pollution as the reason. If you are travelling with younger children and want to skip the climb entirely, the Reykjanes minibus loop reaches cooled lava on short walks instead.
Will I see lava on the hike?
Not flowing lava. Fagradalsfjall last erupted in 2023 and nothing has erupted anywhere on the peninsula since 5 August 2025. Both operators state plainly that glowing lava cannot be guaranteed. What you get is the cooled flow itself, steam still rising from cracks in it, and warmth you can feel through the crust.
What happens if the weather is bad?
The hike usually runs anyway. Reviewers describe walking it in constant rain, wind and mist and still enjoying it. Operators cancel only for genuinely unsafe conditions, road closures or high gas readings, and a cancellation from their side means a full refund. You can also cancel yourself up to 24 hours ahead for a full refund.
Do I need a guide, or can I walk it alone?
The paths are marked and you can walk them alone. What a guide adds here is unusual though: on one hike it is a geologist who researches the volcano, on the other someone who was evacuated from Grindavík. Reviewers consistently rate the guiding above the view.
What Hikers Said
Exploring the Fagradalsfjall lava fields with a career geologist is a must. […] France was thorough in her explanations of the various features and phenomena we witnessed, from a landscape scale to the minute detail of mosses colonising the fresh lava.
Oddi was phenomenal. He is from Keflavík so very close to Grindavik and knows the whole history of the area. You start in Grindavik and learn about the events in recent years that have left it a ghost town. […] Safety is of the utmost importance with Oddi.
Do heed the description of the activity: we went slowly with frequent photo stops, but you do need to be ready, both physically and gear-wise for a hike up a volcano in Icelandic weather. I would do this tour again: there was so much to see and learn.
Quotes from the GetYourGuide listings for both hikes, reproduced as written and shortened where marked.