Peak season starts in September, not November

July 2026 · 8 min read · Angler Fulfilment

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. 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 — 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.

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