Peak season fulfilment starts in September, not November

Published 1 July 2026, updated 10 October 2026 · 8 min read · Angler Fulfilment

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Peak does not go wrong in November. It goes wrong in September, when the stock order was too small, the packaging lead time was underestimated, and nobody checked the carrier cut-off dates. November is simply when you find out.

The frustrating part is that peak failures are almost entirely preventable, and preventable with unglamorous work: counting things, ordering things early, and writing down what happens when something runs out. None of it is difficult. All of it has to happen before demand arrives.

September: forecast and commit

Build the forecast from last year, then discount it

Take last year's weekly units by SKU for October to December. Apply your actual year-on-year growth rate: the real one from your accounts, not the one in the plan. Then look at what is different this year: SKUs you no longer sell, a channel you have added, a product that has quietly stopped moving.

Forecast by SKU, not in total. A total forecast that is right in aggregate and wrong per SKU still leaves you out of stock on your bestseller and sitting on a pallet of the one nobody wanted.

Decide what you are prepared to sell out of

You cannot fully cover every SKU without tying up cash you may not have. So decide deliberately: which products must never go out of stock, which can, and at what point you pull their advertising rather than keep paying for traffic to a sold-out page. Making this call in September is strategy. Making it in November is damage control.

Order packaging now

Boxes, mailers, tape, void fill, labels, inserts. Custom-printed anything has a lead time that stretches badly in October. Work out your peak consumption from your forecast, add a genuine margin, and order it. And check where it will be stored. If your 3PL is holding it, that is space, and space is billed.

October: pre-position and rationalise

Get stock in early

Every warehouse in the country is receiving at once in late October and early November. Goods-in queues, and a pallet that sits unreceived is a pallet you cannot sell from. Book your delivery slots early and get your peak stock in ahead of the crowd. If any of that stock is bound for Amazon, the inbound cut-off and the storage band are set out in Amazon’s Q4 storage and peak fees. Our own commitment is booking in within 48 hours of arrival, but the delivery still has to be booked.

Cut the tail

Peak is the wrong time to be picking a 400-SKU catalogue where 60 SKUs do 90% of the volume. Delist or hide the deadwood for the season. Fewer SKUs means faster picking, fewer errors and less storage. You can bring them back in January.

Confirm the numbers that will change

• Your 3PL's peak surcharge, as a figure. Ours is 20p per order in November and December and it is shown on every quote
• Carrier surcharges and any peak service changes
• Whether your dispatch cut-off shifts during peak, and whether your website says the same thing your warehouse does
• Capacity: ask your 3PL directly whether they have committed to volumes that would put you behind someone else in the queue. A straight answer to that question tells you a lot

Extend the returns window before you advertise it

Most sellers extend the Christmas returns window. That is sensible, and it converts. Just check your 3PL can absorb a January returns spike before you publish the promise. Returns processing capacity is the most commonly overlooked part of peak planning, and January is when it bites.

November: cut-offs and communication

Publish your last order dates

Work backwards from the carriers' published Christmas deadlines, subtract your own dispatch cut-off, and subtract a working day of margin. Then put those dates on the product page, not buried in a delivery policy. Sellers consistently underestimate how much late-December conversion comes from a visible, credible last-order date.

Write the out-of-stock rule down

Decide in advance what happens when a bestseller sells out: pause the ads, swap the hero product, offer a substitute, or take backorders with an honest date. Write it down and give it to whoever is watching the store. Decisions made at 11pm on Black Friday are worse than decisions made in November.

Check what the carriers can actually take

Everything above is about your own stock and your own dates. The part you do not control is whether the network has room. From the Black Friday weekend through Cyber Monday and on into December, Royal Mail, Evri and DPD are all moving far more than they do in an ordinary week, and carrier capacity, not your picking, is what decides whether a parcel leaves on the day it was packed.

Two practical consequences. Collection slots get tighter, so a late booking is a late dispatch however early the order was picked. And the cost moves: Royal Mail runs a peak surcharge on account parcels from 2 November to 10 January, which we have set out with the rest of the dates that change what a parcel costs. Ask your 3PL which carriers it is booked with for peak and what happens when one of them caps volume, because the honest answer is that a second route has to already exist.

Staffing is the mirror image of the same problem. A warehouse running peak on overtime alone is one sick week away from missing your cut-off. Ask how the extra hours are covered and when the extra people start, and note that the answer should be a date in October, not a plan for December.

Agree the escalation route

Who do you call when something is wrong at 5pm on the Friday of Black Friday weekend, and what is the response time? If the answer is a shared inbox, get a phone number.

December and January: the part everyone forgets

Peak is not over when the last Christmas order ships. Returns arrive from Boxing Day through to the end of January, and if you extended your returns window they arrive later still.

• Confirm your returns turnaround with your 3PL for January specifically. Ours is inspection, grading and restock within 3 working days, but ask about January, not about a normal month
• Decide your grading rules now: what gets restocked as new, what is sold as open-box, what is written off. Ambiguous rules in January become a warehouse full of unsorted returns
• Plan the January stock count. It is the one month where the count is both easiest and most necessary
• Do a post-mortem while it is fresh. What sold out, what did not sell, what broke operationally, what you would order differently. Write it down in January and it is worth ten times more than trying to remember it next September

Questions worth asking your provider, and the answers to listen for

Everything above is about what you control. This part is about finding out, while it is still October, whether the people packing your orders are ready. Each of these has a specific answer. A vague reply is itself the answer.

• What is your dispatch cut-off in December, and does it move? Some providers quietly pull the cut-off forward once volume climbs. If yours does and nobody tells you, your product pages are advertising a promise the warehouse stopped keeping.
• Which carriers are you booked with for peak, and what is the second route? If the answer names one carrier, the plan is that nothing goes wrong.
• When do the extra people start? A date in October is a plan. “We will put the hours in” is not a plan, it is a hope with a rota attached.
• What is your returns turnaround in January? Ask about January by name. The normal-month answer tells you nothing about the month that matters.
• What did last December actually look like? Ask for dispatch accuracy and the on-time rate as numbers. A provider who measures it will have it to hand. A provider who does not will give you an adjective.
• Who do I call at 5pm on the Friday of Black Friday weekend? A name and a number, or a shared inbox. You will find out which one it is eventually. October is a better time to find out than November.

Signs a provider is not peak ready

None of these is fatal on its own. Two or three of them together, in October, is a reason to have a plan rather than a hope.

• They cannot tell you last December's numbers, or they answer with adjectives instead of figures.
• Your stock figure and theirs have disagreed at some point this year and nobody ever established why. Peak multiplies that.
• Peak pricing arrives as a surprise instead of being on the rate card you signed. A surcharge is fair. A surcharge you learn about on the invoice is not.
• Goods-in is already slow in September. Receiving does not get faster in November.
• They are still taking on new clients in late October with no mention of a cap. Somebody's peak is paying for that, and it might be yours.
• Replies take days when nothing is wrong.

Should you switch fulfilment provider before peak?

Usually no. We are a 3PL, this article is on our own site, and the honest answer is still usually no.

The thing that makes a late move dangerous is not the new provider's setup. Onboarding is fast now: ours starts the day you say yes and you can take orders within three days of your stock arriving. The danger is the stock itself. It has to be picked up, moved, received, counted and reconciled, and every one of those steps is slower in November than in September because everybody's warehouse is full and every carrier is busy. A count that disagrees in the first week of December is a problem with no quiet month to fix it in.

A reasonable cut-off is this: if your stock cannot be physically in the new warehouse and counted before your volume starts climbing, the move belongs after peak, not before it. For most sellers that means a decision made in early October at the latest, and for anyone whose peak begins with Black Friday it means earlier still.

If you are already past that point, the better plan is almost always to get through peak where you are, keep a written record of everything that goes wrong while it is happening, and move in January. January is the easiest month of the year to switch: volume is low, the returns are through, and you need a stock count anyway, which is the single most time-consuming part of any move. The notes you took in December are also the best brief you will ever give a new provider.

The exception is when the current provider is already failing in September, with orders going out late or stock that cannot be trusted. Peak does not rescue a relationship that is broken in a quiet month. If that is where you are, moving is the lower risk, and it is worth moving now rather than in six weeks.