★★★★★
Wear the boots. I did not and I regretted it within ten minutes.

Reykjavik
A short season, a meeting point that is not in Reykjavik, a walk that decides who can come, and a day it takes whole.
This is not a thing you slot into an afternoon. It runs in a short season, it starts at a ski hut half an hour outside the capital rather than in it, it asks for ninety minutes of walking on ground that punishes the wrong shoes, and it takes a whole day from a country most visitors see in four.
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Weather
Reykjavik month by month. The plateau is higher, colder and frequently in cloud.
Boots
Required rather than recommended. The operator names sneakers and jeans as unsuitable, which is unusually direct for a booking page and worth taking literally.
Practical
Included
Tour details
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Reviews
Most of what goes wrong with this day is decided before anyone leaves their accommodation, and it is always one of the same four things.
The meeting point is not in Reykjavik. The start is a hut in the hills, some thirty minutes out of town, and anyone expecting to be collected downtown finds out at a bad moment. Transport there is an option you tick at booking rather than something that happens automatically.
The footwear requirement is literal. Hiking boots, and the operator specifically names trainers and jeans as not suitable, which is a level of directness you rarely see on a booking page and exists because the ground genuinely demands it.
The day is a whole day. Six hours plus the driving at either end leaves nothing usable afterwards, and anybody planning a second excursion for the same afternoon is going to be disappointed.
And the weather on the plateau is not the weather in the city. Half an hour and several hundred metres is enough to produce fog when the capital is in sunshine, which affects what you pack rather than whether you go.
This runs in the warmer part of the year and stops for the rest of it. The constraint is not the chamber, which is the same temperature in February as in July, but the walk to it.
Getting a group of twenty across three kilometres of uneven lava field, and back, in weather that arrives without much notice, is a reasonable proposition for part of the year and not for the rest. When the operation stops, that is why.
Within the season the practical differences are daylight and the odds on the weather. This is a country where midsummer barely gets dark and midwinter barely gets light, and while the tour does not run in the depths of the latter, the shoulders of the season have noticeably shorter days and worse odds on a clear plateau.
The filter is the walk, not the descent. Physically, being lowered on a platform and standing on a slope for an hour asks almost nothing of anybody. Ninety minutes over broken lava under moss asks a fair amount.
Anyone whose mobility is limited is told plainly by the operator that this trip will not work for them, and that is a description of the terrain rather than a form of words. There is no vehicle access to the crater and no shortened route.
For everyone else it is a question of ordinary fitness and sensible expectations. It is not steep and it is not fast, and it is uneven at every step, which is tiring in a way that distance alone does not convey. People who walk regularly find it unremarkable. People who do not find it the hardest part of the day.
Where the operator has not published a rule - a minimum age, for instance - this site will not invent one. Ask at booking; the answer is specific to the day and the group.
The pattern here runs opposite to most people's expectations, so it is worth stating plainly.
Included: the descent, all safety gear, guides throughout, and a hot meal at the end - the lamb and root-vegetable broth Icelanders eat everywhere, a meat-free version for anyone who wants it, and a hot drink with something sweet alongside.
Optional: getting to the meeting point. Pickup and drop-off in Reykjavik is a choice made at booking rather than a default, and if you do not select it you are driving yourself to a cabin in the hills.
So the food is free and the transport may not be, which is the reverse of nearly every other excursion sold in this country. It is the single most common source of confusion about this booking.
Give it a day and put that day early. The reasoning is entirely about weather: this is an outdoor operation on an exposed plateau with free cancellation, and a booking early in your stay can be moved if conditions are poor, while one on your last day cannot.
Do not pair it with the Golden Circle or the south coast. Those are long driving days in their own right and this is not an add-on to anything.
Do not put it on an arrival or departure day. The timings are fixed, the walk is real, and neither combines well with an airport.
And base yourself in Reykjavik, which is where almost everybody stays anyway and is the only sensible starting point given where the meeting cabin is.
The throughput is five people at a time on a platform. That is a hard ceiling, and combined with a short season it makes this one of the few things in Iceland where booking ahead genuinely matters rather than being cautious advice.
Free cancellation is offered, which is the right arrangement for something the sky gets a vote on, and it is worth understanding as a scheduling tool rather than an insurance policy: it lets you hold a date early in your trip and move it if the plateau is having a bad week.
Arrive ten minutes before the stated time. Gear is fitted as a group, and a late arrival delays a schedule that ends in a winch running to a timetable.
Questions
Guides