The last days to restock before Christmas: a December reorder calendar

Christmas 2026 lands on Friday, December 25 — but the date that actually runs your December is the last day a restock PO can land, get counted, and become sellable. For most shops that's somewhere between December 16 and 19, not the 25th.

Work backward from there and every supplier type gets a hard order-by date: one-week domestic suppliers need the PO placed around December 9, two-week suppliers around December 2, and anything on the water already missed Christmas entirely. This is the December tail — everything up to and through Black Friday lives in the BFCM planning hub; this article starts the Monday after.

The three dates that matter

December restocking is three dates in a chain, and you control the middle one:

• Sellable-by — the last day stock can be counted, put away, and live for sale. Set it by when your customers stop being fulfillable, not by Christmas Day. Gift buying largely runs December 1–22; after that, standard shipping stops making promises and late buyers shift to express or local pickup.
• Receive-by — sellable-by minus your receiving time. Counting and putaway that takes two quiet days in June takes longer in a December backroom. Budget two days minimum, three if you'll be fulfilling at the same time.
• Order-by — receive-by minus the supplier's real lead time. Not their quote: your measured history. If your one-week supplier has been averaging nine days, December 9 is not your date — measuring actual lead time from PO history is what makes every date in this article true for your store.

The customer-side deadline is the one that moves every year: parcel carriers publish holiday cutoff calendars each November, and ground cutoffs have historically clustered in mid-December with express services extending a few days closer to Christmas. As of November 2026, check your carriers' current-year calendars before promising any delivery date to customers — the cutoffs shift annually, and your sellable-by date inherits whatever they say.

The December 2026 reorder calendar

Built for a main restock wave with sellable-by December 18 and two days of receiving (receive-by December 16). Shift every date by your own receiving speed and measured lead times.

Notes on the table:

• The last-call column exists only for short-lead suppliers and only if you'll fulfill the final orders on express services. It's a top-up of winners, not a restock — and it assumes the supplier will commit to a ship date in writing.
• Air from overseas at three weeks door-to-door means the order needed to be placed in late November. If you're reading this in early December with an ocean PO still open, the honest answer is that it arrives in January; decide deliberately whether a small air top-up of one or two hero SKUs is worth the premium, rather than air-freighting the whole container by reflex.
• Peak surcharges inflate the last mile exactly when volume spikes — carriers apply them through the December peak, and they belong in your December cost math. The peak-season surcharge dates covers which services and which windows.

The December math on one SKU

A coffee shop restocking its gift trio (GFT-COF-3, three-bag sampler) illustrates the whole calendar. Baseline velocity outside December: 6.5/day. Last year, December 1–22 ran 2.9× baseline ≈ 19/day — use your own historical uplift, whatever it is; there's no universal December multiplier.

• Demand to cover Dec 1–22: 19 × 22 ≈ 418 units.
• Stock on hand November 30: 240. Remaining to cover: 178 units (and that's the minimum — December upside is real).
• Main-wave packer: 12-day lead + 2 days receiving = 14 days. Sellable-by Dec 18 → order-by December 4 for 300 units.
• Top-up: local co-packer, 4-day lead. Sellable-by Dec 22 → receive-by Dec 18–19 → order-by December 16 for 120 units, only if the first week's data says the uplift is holding.

The discipline in that example is the split: a main wave ordered off last year's uplift, and a small top-up ordered off this year's first-week data. December punishes both under- and over-ordering, and the two-wave structure is how you avoid guessing the whole month in one PO.

The courier cutoff trap

The dates above get stock into your hands. Getting orders into your customers' hands is a second clock, and it's the one merchants misread: your sellable-by date is only valid while carriers can still deliver. Three practical rules:

1. Publish nothing until you've checked the current-year cutoff calendars — as of November 2026, USPS, UPS, and FedEx all publish them each November, and ground-vs-express gaps are wider than most merchants assume.
2. Set your own "order by" banner two days earlier than the carrier's ground cutoff so a slow fulfillment day doesn't turn into a Christmas-morning support queue.
3. Watch the surcharge stack — peak-season fees make express the priciest week of the year to promise casually.

And one Shopify setting worth ten minutes on December 1: verify that "continue selling when out of stock" is off on your December winners unless you're deliberately taking dated backorders. A December oversell doesn't just refund — it converts your best customers into your angriest ones (the overselling fixes, if it's already happening).

The January you're buying in December

Every ocean PO you place in December is a January purchase wearing a December invoice. Two things follow. First, don't let December panic order the wrong depth: the stock landing January 15 should be sized for February demand, not for the Christmas you just missed.

Second, the overseas clock is about to hit its own wall — the Chinese New Year 2027 factory shutdown compresses the winter production window weeks earlier than the calendar suggests, and the CNY 2027 buying deadline is the date that decides whether your spring restock happens on time. December is exactly when a small import store should be looking past Christmas at that second deadline.

The December routine: twice a week, not once

The rest of the year, a Monday buying review is enough. In December, run it Monday and Thursday:

• Monday: the full pass — cover on every winner, PO status on everything in transit, and the order-by calendar above cross-checked against what's actually arrived.
• Thursday: a light pass — just the heroes. Did last week's data change the uplift? Is any top-up order-by date in the next five days?

We build InventoryX, and its Monday Buying List computes an order-by date per SKU from the lead times you enter — in December, that column is the whole game, which is why the routine is checking it twice as often. Whatever tool or spreadsheet runs your week, the rule is the same: December decisions get made on dates, not on how the stockroom feels.

Common questions

What is the last day to order inventory for Christmas? It depends on your supplier's real lead time. For a main wave sellable by December 18 with two days of receiving, one-week domestic suppliers need the PO by about December 9, two-week suppliers by December 2, and 3–5 day parcel suppliers by December 11–13. Work backward from receive-by; use measured lead times, not quotes.

When should I stop reordering before Christmas? Around December 15–16 for short-lead domestic suppliers, and only as small top-ups of proven winners that you'll fulfill on express services. After that, every PO risks landing into the dead zone between carrier cutoffs and Christmas, where it arrives to a demand window that has already closed.

Can I still restock from overseas in December? By air, only if the order goes out immediately — three weeks door-to-door puts late-November orders at the edge. By ocean, no: a December ocean PO lands in January, so treat it as a February-demand buy, sized for the new year rather than for the Christmas you missed.

Do carrier shipping cutoffs affect when my restock must arrive? Indirectly, but decisively: customer delivery cutoffs — historically mid-December for ground services — define your sellable-by date, which drives receive-by and order-by. Carriers publish holiday cutoff calendars each November (as of November 2026); check the current ones before promising any customer a date.

How much extra stock should I carry for December? Use your own December uplift from last year — December sales divided by your baseline daily velocity — applied per SKU, not a flat percentage across the catalog. A 2.9× uplift on a gift trio and a 1.4× uplift on everyday items need different orders. Split the buy: main wave off last year's data, top-up off this year's first-week numbers.

Next step

Take your top ten December SKUs and write three dates next to each: sellable-by (from your carriers' published cutoffs), receive-by (minus two receiving days), order-by (minus measured lead time). Anything whose order-by date falls within the next ten days gets placed first — and if the lead times you just used came from supplier quotes rather than PO history, fix that input now: measuring your real lead time takes about an hour per supplier and makes every date above yours.