Q4 is where fulfillment either makes your year or breaks it. The brands that coast through BFCM and the December crush aren’t lucky — they did the boring prep work in August and September. Here’s the checklist we walk our own clients through.
1. Forecast inventory early — and build in a buffer
Peak demand is not your average month scaled up; it’s spiky and concentrated. Pull last year’s daily order data (or your best estimate), identify your top SKUs, and forecast Q4 units by week — not by month. Then add a buffer for your winners, because the cost of a stockout during peak (lost sale + lost ad spend + ranking hit) is far higher than the cost of a little extra storage.
If you’re selling on Amazon, remember FBA has restock limits and longer receiving times in Q4. Getting inventory in early is the single biggest lever. (See our FBA prep checklist for what “receiving-ready” actually means.)
2. Lock carrier capacity and understand peak surcharges
Every major carrier adds peak/demand surcharges in Q4, and they change the rules each year. Don’t get surprised at invoice time:
- Ask your 3PL which carriers they’re using for peak and what the surcharge schedule looks like.
- Right-size your packaging now so you’re not paying dimensional-weight penalties on every order during your highest-volume month. A single box change can cut 10–20% of parcel spend — run your numbers on our free dimensional weight calculator.
- Confirm cutoff times for guaranteed delivery dates so your customer promises are real.
3. Pressure-test your fulfillment provider before the rush
Ask your 3PL directly:
- What’s your receiving turnaround during peak — 24 hours, 48, or “it depends”?
- What’s your pick accuracy and on-time-ship rate, and does it hold under 3–5x volume?
- How do you staff for peak, and what’s the cutoff for same-day shipping?
- What’s the plan if a carrier has a service disruption?
If the answers are vague, that’s your answer. This is also the season when brands discover they’re with the wrong partner — but do not switch 3PLs in Q4. Plan the move for January instead, and do it right: here’s how to switch your 3PL without downtime.
4. Get your Q4 economics right
Peak volume with peak surcharges can quietly erode margin. Before the rush, get an all-in cost estimate on your projected Q4 order profile — pick/pack, receiving, storage, and surcharges — so you’re pricing and promoting profitably. Our transparent breakdown of 3PL costs shows the line items to check for.
5. Position inventory close to your customers
Transit time is a cost and a conversion lever. If a large share of your customers are on the East Coast, shipping from the Mid-Atlantic puts them in 1–2 day ground zones without paying for air — which matters most when volume (and shipping spend) peaks. More on the East Coast speed math here.
The 30-second version
- Forecast Q4 by week, buffer your winners, get FBA inventory in early.
- Right-size packaging now; know your carrier peak surcharges.
- Pressure-test your 3PL’s peak receiving/accuracy — don’t switch during Q4.
- Model your all-in Q4 cost before you promote.
- Ship from close to your customers to protect speed and spend.
Prep in August and September, and December takes care of itself.
Questions about peak-season fulfillment? See our 3PL & fulfillment FAQ or reach out — Shipo LLC runs a 55,000 sq ft East Coast fulfillment center for Shopify/DTC brands and Amazon FBA sellers.