By the time Black Friday arrives, almost every outcome is already decided. Whether your bestsellers are in stock depends on a purchase order placed months ago. Whether orders ship on time depends on whether your warehouse knew what was coming. Whether customers get gifts before Christmas depends on messages you set up in advance. Peak season rewards brands that plan backward from their biggest days, and it's rough on everyone who plans forward from today.
To prepare for peak season, forecast demand by SKU, get holiday inventory received at your warehouse by early November (earlier for Amazon FBA), share your promotion calendar with your 3PL, pre-build kits and gift sets in October, budget for carrier peak surcharges, publish holiday shipping cutoffs, and plan for a wave of returns in January. In 2026, Black Friday is November 27 and Cyber Monday is November 30.
Start With the Dates That Matter
Mark these on a calendar and plan everything relative to them.
Add your own dates: product launches, email campaigns, any marketplace events like Amazon's October sale, and the date your supplier's final holiday shipment leaves the factory. Carriers publish their holiday shipping deadlines each fall, so update the December dates once they're announced.
Forecast by SKU, Not by Total
"We expect Q4 to be 40% up" isn't a forecast your warehouse can use. They need to know which products, how many and when. A simple method:
Start with last year's same weeks
Units sold per SKU, week by week, from early November through December.
Apply your growth rate
Use your actual year-over-year growth for the last few months, not your hopes for Q4.
Add promotion lift
If you're running a bigger discount or a new campaign, estimate the extra lift for the specific SKUs being promoted.
Handle new products separately
With no history, forecast conservatively and hold a reorder option with your supplier if possible.
Then add safety stock where it matters most. Your top ten SKUs deserve a bigger buffer than the long tail, because a stockout on a bestseller during Black Friday week costs far more than leftover units of a slow seller in January.
Work Backward From Arrival Dates
For most brands, holiday inventory should be received and sellable at the warehouse by early November. Work back from that date through your supply chain:
- Receiving time: warehouses get busy in October and November. Allow extra days for inbound processing, and book receiving with your 3PL in advance.
- Transit: ocean freight, port congestion, customs clearance and trucking can each slip by a week or more in the fall. Build in slack.
- Production: your supplier needs to finish in time for all of the above, which usually means placing orders in summer.
For Amazon FBA, move earlier still. Fulfillment centers slow down on check-in as Q4 volume rises, and capacity limits restrict how much you can send. Many sellers aim to have holiday stock checked in at Amazon by late October, with backstock held at a 3PL for replenishment. If your inventory arrives late, having an FBM offer ready from your 3PL can keep the listing live.
October: Build Everything You Can in Advance
October is the last calm month. Use it to get work out of November's way.
Anything that needs assembling should be built and received as finished SKUs before November. Kitting in peak week competes with outbound orders for the same people.
Boxes, mailers, tissue, inserts. Suppliers get backed up too. Order enough for your forecast plus a buffer.
Give your 3PL every campaign date and expected volume. A warehouse that knows a spike is coming can staff for it.
Avoid new SKUs, new packaging or new integrations in November. Every change during peak is a chance for errors.
Budget for Carrier Surcharges
Carriers add peak or demand surcharges during the holiday season, typically running from around October into January, and sometimes higher for large or heavy packages. They also tend to raise base rates in January. Ask your 3PL how peak surcharges will appear on your invoice, and factor them into your holiday pricing and free-shipping thresholds. A free-shipping offer that makes sense in August can lose money in December.
December: Set Expectations Before Customers Ask
Once carriers publish their holiday deadlines, work out your own last order dates for Christmas delivery by shipping method, and add a day of buffer. Then show them everywhere: a banner on your site, product pages, the cart, and order confirmation emails. It prevents the most frustrating support tickets of the year and helps you sell expedited shipping to late shoppers.
After the ground cutoff passes, shift messaging to expedited options, gift cards and "ships after the holidays" notices on anything that can't arrive in time.
January: The Returns Wave
Holiday returns arrive in the first weeks of January, just as everyone wants a break. Plan for them. Make sure your returns process can handle several times its normal volume, that grading rules are written down, and that restocked items get back into available inventory quickly for post-holiday sales. See our returns guide for how to keep costs down.
What Usually Goes Wrong
- Inventory lands late. Usually a purchase order placed a few weeks too late, with no slack for transit delays.
- The warehouse finds out about a promotion when orders arrive. A 10x spike with no warning means backlogs, no matter how good the team is.
- Kits get built during peak week. Assembly work fights outbound orders for the same hands.
- Packaging runs out. The wrong box size on Cyber Monday leads to substitutions, damage and higher postage.
- Free shipping stops being profitable. Surcharges and heavier orders change the math, and nobody rechecked it.
- Returns get ignored until February. Resellable stock sits in a pile while customers wait for refunds.
Every one of these can be prevented in September or October. If you're reading this with enough time left, send your forecast and calendar to your warehouse this week. If you're weighing a fulfillment change, do it after the holidays, not before. For more on that decision, see how to choose a 3PL.
Frequently Asked Questions
Summer for purchasing and production, September for forecasting and coordinating with your warehouse, and October for receiving inventory, building kits and stocking packaging. November should be for executing the plan, not making it.
For most brands, holiday inventory should be received and sellable by early November. Allow extra time for fall transit delays and slower receiving as warehouses get busier.
Earlier than to your own warehouse. Check-in slows as Q4 volume rises and capacity limits apply, so many sellers aim to have holiday stock checked in by late October, with backstock held at a 3PL for replenishment.
Extra fees that carriers add during the holiday season, typically from around October into January, on top of normal rates. Amounts vary by carrier, service and package size. Factor them into holiday pricing and free-shipping thresholds.
Forecast by SKU using last year's same weeks, your real growth rate and planned promotions, then hold extra safety stock on your top sellers. Get inventory received early and keep an FBM or website fallback for Amazon listings.
Expect a surge in early January. Make sure your returns process can handle several times its normal volume, grading rules are written down, and resellable items are restocked quickly for post-holiday sales.
Usually not in the final two to three months before your busiest period. Switching involves integration, inventory transfer and a learning period. If a change is needed, plan it for the first half of the year.
Planning Q4 with us?
Send us your forecast, promo calendar and inbound schedule. We'll plan receiving slots, pre-build any kits and staff for your peak days, and tell you early if anything looks tight.