Travelling Japan while the whole country is also travelling

Why this week is not like other weeks in Japan

Japan has a cluster of public holidays falling close together in late April and early May, which lets a large share of the workforce take a longer continuous break. The result is that the whole country travels at once: long-distance trains fill, expressways jam, and the main tourist cities absorb several times their usual crowd. The exact dates are not the same every year, because they depend on which weekdays the holidays land on, so check Japan's official public holiday calendar before buying flights.

For phone use this means two things. First, you will lean on apps more, because plans break more often than usual — trains full, queues long, attractions capping entry. Second, the network in the dense spots slows in bursts at exactly the moments you need it.

The apps you will reopen most that week

• A rail routing app, which you will open dozens of times a day when a train fills and you need the next one
• The rail operator's reservation app, for the reserved seats that need booking ahead
• A map app with offline maps of the cities you will visit, for the moments when a station's network crawls
• A translation app with Japanese downloaded in advance so it still works when data is slow
• Accommodation and restaurant booking apps, far more necessary in this period than usually

Preparing before and during the week

1. 1Before booking flights: check Japan's holiday calendarThe dates of the long holiday move each year with the weekdays. Look at Japan's official public holiday calendar to find out whether your trip lands inside the peak.
2. 2Weeks ahead: reserve seats and accommodationReserved long-distance seats and rooms in the main cities go early in this period. Book through the operator's own channels and keep the confirmations on the device.
3. 3Before flying: install the eSIM and set the apps upInstall the profile on home Wi-Fi, set it as the data line, and finish downloading offline maps and the Japanese language pack before you leave.
4. 4On a long travel morning: get the screens ready firstOpen your ticket, train details and the destination address before entering the station, so nothing has to reload while you are inside the crowd.
5. 5During the trip: check usage every couple of daysThis week eats more data than expected because of repeated route searching. If you are burning through it faster than planned, top up while you still have a connection.

How much data to allow

An ordinary Japan trip is not data-hungry if the accommodation has Wi-Fi, but the long-holiday week changes that equation: you are out of the room longer, searching routes more often, and queueing in places where there is nothing to do but look at the phone. The figures below are planning estimates only, not a guarantee of your own usage.

• A city day with frequent route searching: roughly 1–2GB
• A day moving between cities by long-distance train: roughly 1.5–2.5GB
• A seven-day solo trip: roughly 10–15GB is a sensible starting point
• If you tether for the family, multiply by the number of devices actually connected

If reserved seats sell out and the plan has to change

Even with an advance booking, the reserved seats you want can sell out before you manage to click confirm, especially on the morning and evening services of the days when the most people move cities at once. When this happens mid-trip, the response differs from an ordinary day because the fallback options are also selling out. Having connectivity that works right away matters more than a written backup plan, because you need to reopen the booking app, check the non-reserved cars on the next service, and possibly find an unplanned night's accommodation if you end up stuck longer than expected. What makes this harder is that you are usually standing in the most crowded station in the country at exactly the moment you need to decide fast.

• Have the reservation app already open and know where to tap before seats sell out; it saves crucial time when a decision must be fast
• Remember that most services still carry a non-reserved car; standing is worse than sitting but far better than no train at all
• If an emergency room is needed mid-route, use an accommodation app already installed rather than searching from scratch

Long queues and a battery that dies before evening

During Golden Week, queues for popular attractions and for some trains can run to an hour, and standing in line is exactly when people pick the phone up most — checking how far the queue has moved, reading the news, or sharing photos while waiting. That habit drains the battery faster than an ordinary sightseeing day even when the actual walking distance is shorter, because most of the time becomes screen-on time rather than walking time with the screen resting. The practical fix is shortening the auto-lock timer for the week, and carrying a power bank even on a day you expect to travel light.

Common sizing mistakes for this week

The most common mistake is sizing data the same as a previous ordinary Japan trip, forgetting that Golden Week changes your usage pattern for the whole week, not just the long travel days. Re-searching routes when a train is full, checking a queue while waiting, and finding a fallback room mid-trip all happen far more often than on an ordinary trip. Another mistake is assuming a smaller city that is not the main destination will be quieter than Tokyo or Kyoto, when in fact many people deliberately avoid the big cities and head to secondary ones during exactly this week, leaving the network there busier than expected too.

A full Shinkansen and the fallback plan you have to find in real time

Golden Week is one of the few times a year when reserved seats on major Shinkansen lines genuinely sell out days in advance, not just in theory. If you did not book ahead and arrive at the station to find your intended train full, what comes next is searching for the next available departure or a longer indirect route that still gets you there — all of it in real time, inside a crowded station where the network may well be slower than usual at that exact moment. Having a train timetable app with offline data downloaded in advance helps a great deal here, since it removes the need for a live connection to work out the alternative.

When to buy a plan for this particular week

Because Golden Week falls on fixed dates tied to Japan's public holiday calendar, announced well in advance, flights and accommodation tend to get booked far earlier than for an ordinary trip. The data plan does not need the same urgency, since most plans only start counting days once you activate them yourself, not at purchase. The convenient approach is installing the profile weeks ahead while still on home Wi-Fi, then leaving it to switch on once you land in Japan — the days closer to departure usually have enough else to organise.

The small towns people flee Tokyo's crowds to reach

Another shape of Golden Week trip, more common every year, skips the major cities altogether for a small rural town or a coastal one that never makes any popular list. Travellers who do this tend to get both calm and a better network than the main tourist cities, but trade it for the fact that shops and local transport in some small towns close on certain days of the week for reasons that have nothing to do with Golden Week at all — something general online listings often fail to update in time. Calling the accommodation directly or checking the shop's own website beforehand tends to be more reliable than trusting a map search result.

The long queues outside famous ramen shops and restaurants

Famous restaurants in major tourist cities tend to see noticeably longer queues during Golden Week. Some now use an online queue-booking system or an app-based ticket instead of standing in a physical line, which saves a lot of time if the network is holding up well at that moment. A common problem is that a large number of people all try to book a slot at the same time each morning, which can make the restaurant's own booking system unusually slow even when the overall mobile network is fine. It helps to try booking as soon as the shop opens its queue rather than waiting until close to the time you actually want to eat.

Small local train lines that run fewer services than usual on certain days

Beyond the main Shinkansen line, many Golden Week trips also connect onto a small local train line heading into rural areas or a secondary town, and some of these lines actually reduce their schedule on public holidays rather than adding services for visitors, contrary to the common assumption that a long holiday means more frequent trains. Checking each local line's timetable directly through the operator's own app or website before travel day matters more here than guessing based on experience with the main line, and it is worth having a local bus as a backup plan in case the train you wanted simply is not running that day.

A backup plan for when a shop or attraction suddenly fills up

During Golden Week, some shops and attractions can announce they are full without warning even shortly after opening, because far more people than usual try to get in at the same time. Having a stable connection lets you look up a nearby alternative immediately instead of standing confused outside a place that has already stopped taking arrivals. It helps to decide in advance what the backup plan is for each important stop on the trip.

Estimate the data you need