Ecommerce peak season: preparing for Black Friday and Christmas

An ecommerce peak season does not create new problems. It magnifies the ones already present, which is why preparation is mostly a matter of finding out what is already fragile. In 2026 Black Friday falls on 27 November and Cyber Monday on 30 November, which leaves roughly seven weeks from the start of October to decide what you want in order.

This page is for a webshop that holds its own stock and despatches its own parcels, from one picker up to a team of a dozen. It is not written for sellers whose fulfilment sits with a third party, and not for operations whose peak is already measured in pallets per hour; the thinking applies but the numbers do not.

First: how big is your peak?

Before anything else, find out whether you have a peak at all. Take last year's despatched orders by week and put the busiest week next to an ordinary one. The ratio between them is the only figure that tells you what sort of preparation is justified.

If the busiest week was around 1.3 times a normal one, there is very little to arrange. Check that you hold enough stock on your best sellers, confirm your carrier's arrangements and buy packaging early. Nothing else on this page is urgent.

If it was two or three times a normal week, the operation will behave differently rather than simply faster, and the rest of this guide is for you. If you have no last year to look at, use your own sales forecast, and treat the result as a planning assumption rather than a fact.

What an ecommerce peak season breaks first

Peaks break things in a consistent order, and it is rarely the part people worry about.

Stock accuracy goes first. More movements per day means more unrecorded movements, and the figure online drifts faster than usual at exactly the moment an oversell is most expensive.

Then the packing bench. Picking scales reasonably well by adding people. Packing is often a single bench with a single tape dispenser, and a queue forms there long before the shelves run short.

Then the cut-off. The promise made on the website was calculated at normal pace. At peak pace it is no longer true, and the first missed collection turns into a day of apologies.

Then quality. Errors rise, and the usual explanation — that people were rushing — is only half right. The more common cause is that new people were doing an unfamiliar job with the check step quietly dropped because it felt slow.

Note that none of those four is a capacity problem. They are all the same problem: a routine that worked because one experienced person held it in their head.

A seven-week plan

The order below is driven by lead times rather than importance.

Seven weeks out. Measure the peak as described above. Decide a target: how many orders a day you intend to be able to despatch, and by what time.

Six weeks out. Order packaging, and ask your suppliers for their own cut-off dates for restocking. Supplier lead times lengthen in November for the same reason yours do.

Five weeks out. Speak to your carriers. Collection times change at peak, and Royal Mail publishes recommended last posting dates for Christmas each year — take them from the carrier's own published list rather than from last year's memory.

Four weeks out. Set your cut-off time and publish it. See the next section for how to calculate it.

Three weeks out. Recruit and book any extra people. Agencies are fully committed by mid-November.

Two weeks out. Train the extra people on live orders at normal volume. This is the step that most often gets skipped and it is the one that pays for itself most clearly: somebody learning the job in the quiet fortnight is a help in the busy one, while somebody learning it on Black Friday is a cost.

One week out. Count your fastest-moving lines. Then stop changing things. No new packaging, no new layout, no new software, no new process. A peak is the worst possible moment to introduce anything, and a plan whose last week is empty of decisions is a plan that will hold.

Cut-off times: promise what you can deliver

The calculation is the same one as outside peak, run with peak numbers. Start from the carrier's collection time. Subtract how long picking, packing and labelling take when the bench has a queue, not when it is calm. Subtract a margin for the order that needs a phone call.

What remains is the latest time you can honestly promise same-day despatch. It will be earlier than your normal cut-off, and saying so on the website is better business than discovering it on the day. Customers accept an earlier deadline. They do not accept a deadline that moves after they have ordered against it.

Extra people: how many, and how quickly useful

Size the requirement from order lines rather than orders, because a picker's day is spent on lines. Take your expected peak lines per day, divide by the lines per hour your own pickers actually achieve — measured, not assumed, and the picks per hour calculator will give you that from one timed observation — then divide by the hours in a shift. The warehouse labour calculator does the same arithmetic across picking, packing and despatch together.

On getting new people productive, two things matter more than training material. Give each new starter one complete simple task rather than a share of a complicated one: a new picker working a short list of fast-moving lines from a clearly labelled aisle is useful within a shift, while the same person asked to pick the full range is a liability for a week. And pair them with somebody experienced for the first day rather than handing them a sheet of instructions.

Keeping errors down in the rush

Do not change the method. Whatever you do at normal volume, do more of it rather than differently.

Keep the check step. It is the first thing dropped under pressure and the most expensive thing to drop, because an error caught at the bench costs seconds and an error caught by the customer costs two parcels and a refund.

Keep stock honest. Short counts of your fastest lines, every day during the peak rather than weekly, because an oversell on a best seller during Black Friday is a cancellation on a marketplace metric.

And keep the fast movers close to the bench. If you move anything in the week before, move those.

Returns arrive in January

The peak has a second half that is easy to forget when planning the first. A November and December peak produces a January returns peak, and a returns bench sized for normal volume will be overwhelmed a month after the warehouse has stopped celebrating.

Plan the inspection capacity for January at the same time as you plan the picking capacity for November. Our guide to returns covers the process; the only peak-specific point is that uninspected seasonal stock loses value fast, so January is the worst month in which to let a returns pile grow.

Measuring, so that next year starts where this year ended

Write down four numbers during the peak itself, not afterwards: orders despatched per day, lines per hour achieved, errors per thousand lines, and the time the last parcel actually left. Each one takes a minute a day to record and none of them can be reconstructed in February.

Those four numbers are what turn a survived peak into a planned one. Next October, the measuring step at seven weeks out becomes a comparison rather than a guess.

Frequently asked questions

When should I start preparing for Black Friday?

Seven weeks out is comfortable for a first peak and ample for a repeat one. The reason is not the size of the task but the lead times inside it: packaging, agency staff and any carrier conversation all need notice, and a decision made in the week itself is a decision made under pressure.

How do I work out my cut-off time for the rush?

Take your carrier's collection time, subtract how long picking and packing take at peak pace rather than at normal pace, then subtract a margin. Publish that time and hold it. Moving a cut-off earlier costs you a few orders; missing one costs you the customers who believed it.

How many extra people do I need at peak?

Work it from order lines rather than orders. Take your expected peak lines per day, divide by the lines per hour your own pickers actually achieve, and divide by the hours in a shift. That gives pickers; packing and despatch need their own sum.

How do I keep errors down when the warehouse is busy?

Do not change the method in the rush. Errors rise at peak mostly because new people are doing an unfamiliar job without a check step. Keep the check, keep the routes, and give new starters the simplest complete task rather than a share of a complicated one.

Continue with

• Stock management for webshops — the first thing a peak breaks
• Picking and shipping for webshops — the process you will be running faster
• Returns — the January half of the peak
• E-commerce — the wider picture for online retail

Two questions about your own operation

What was your busiest week last year as a multiple of a normal week, and which of the four things above broke first?

If you add three people in November, what is the simplest complete task you could hand each of them on day one?