Seasonal demand varies by category and business. Use your own sales history, current stock and planned events to identify when peak demand may occur.
Start Planning in Q2
Businesses that consistently win Q4 start inventory planning six months ahead. They're forecasting Q4 demand in June, placing orders in July and August, and have inventory arriving in September — well before the peak selling window.
Understand Amazon's Q4 FBA Deadlines
Amazon enforces strict inbound shipping deadlines for Q4 to ensure inventory is received before peak demand. Missing these deadlines means your inventory arrives after the selling window has peaked. Check the current-year deadlines and plan inbound shipments accordingly.
Have a Markdown Strategy Ready
Even with careful planning, some products will end Q4 with excess inventory. Having a markdown strategy ready prevents excess inventory from carrying into the new year and consuming storage capacity and cash that should be deployed into fresh product.
The fix: Pull your Q4 sales data from the last two years. Calculate your average Q4 to Q3 ratio. Apply that to your current run rate to estimate Q4 demand. Address any inventory gap more than 60 days before peak.
Build the peak forecast from comparable history
Use prior sales by SKU and channel, then adjust for stockouts, promotions, new distribution, assortment changes and known events. Avoid using a simple year-over-year multiplier when the operating conditions are different.
Work backwards from the sellable date
Include supplier production, freight, customs, receiving and marketplace inbound time. The purchase-order date should reflect when inventory must be available to customers, not only when the supplier says it can ship.
Protect inventory across channels
Set allocation rules for Amazon, Walmart, DTC and wholesale accounts before peak demand starts. Review exceptions frequently so one channel does not consume stock reserved for another commitment.
Plan the downside as well as the upside
Model what happens if demand is below forecast. Include storage, markdown, expiry or obsolescence risk so the business understands the cost of overbuying.
For inventory and replenishment support, see e-commerce operations consulting.
Set decision dates before peak
Work backwards from the selling window and establish dates for final purchase orders, air-freight escalation, marketplace inbound cutoffs and promotion commitments. Peak-season inventory decisions become expensive when they are made after all low-cost options have disappeared.
Create an exit plan for excess stock
Define what the business will do if inventory remains after peak: hold, bundle, promote, transfer channels, return to supplier where permitted or liquidate. Include margin and storage implications so the exit decision is made intentionally rather than under pressure.
Track peak inventory separately from baseline inventory
Identify units purchased specifically for a seasonal event so post-season excess can be measured clearly. This also helps finance understand which cash commitment was tied to the campaign.
Review supplier performance after peak
Compare promised versus actual production and delivery dates, then update future lead-time assumptions. Peak planning improves when supplier reliability is measured, not remembered.
Document peak lessons immediately
Record stockouts, excess, supplier delays, promotion performance and emergency freight while the event is fresh. Use those notes as explicit inputs to the next seasonal plan.