Most operators treat Black Friday like a sprint. They don't. It's a relay race that starts in late August, and the baton gets dropped long before the starting gun fires on November 28.
We've tracked replenishment cycles across dozens of mid-market Shopify brands, and the pattern is consistent: the operators who avoid stockouts during peak aren't the ones with the deepest pockets. They're the ones who started the clock 90 days out and made hard decisions at each checkpoint. The ones who waited until October? They were placing emergency air freight orders and watching margin evaporate.
Here's the timeline that separates prepared from panicked.
Day 90 (August 27): Set Your Baseline Before You Forget Last Year
This checkpoint is about pulling clean data, not making decisions. Your job on day 90 is to establish three numbers: last year's Black Friday/Cyber Monday units sold per SKU, your current on-hand inventory, and your standard lead time from each supplier.
The mistake most operators make here is pulling "last year's sales" and treating it as a proxy for this year's demand. It isn't. It's a floor. Factor in any YoY growth your brand has seen in 2026, and add your promotional uplift estimate. If you ran a 30% discount last Black Friday and this year you're planning 35%, that differential alone can swing unit demand by 8-12% on price-elastic SKUs.
on day 90, you also need to decide which SKUs are getting serious promotional support. This isn't a marketing call, it's a replenishment call. The earlier marketing locks in promo depth, the more accurate your reorder quantities will be.
Fact: overseas manufacturers typically quote 45-60 day production lead times for standard MOQ runs during Q4. Add 15-20 days for ocean freight. You are already on the edge of the window before day 90. If you haven't started conversations with suppliers by this date, you are not going to have inventory in time for November 28.
Day 60 (September 26): Lock Overseas Orders. Full Stop.
This is the hard stop most operators miss. Day 60 is the last viable date for ocean freight from most Asian manufacturing hubs. Ocean freight from Shenzhen or Ho Chi Minh City takes 25-35 days to a US West Coast port. Add customs clearance (3-7 days), inland freight to your 3PL (2-5 days), and receiving/put-away time (3-5 days). You are at roughly 40-50 days total from factory release to sellable inventory.
If you place the order on Day 60, you arrive with 7-10 days of buffer before Black Friday. That buffer is not luxury, it's necessary. Port delays, customs holds, and carrier congestion all eat into it. In 2024, West Coast port dwell times spiked to an average of 4.8 days during October, up from 2.1 days in September. Factor that in.
Operators who wait until Day 30 are, in practice, committing to air freight or accepting stockouts. Air freight on a mid-size SKU run can cost 4 to 6 times the ocean rate. We've seen brands spend $18,000 shipping $22,000 worth of product by air because they missed this window. That's not a supply chain problem. It's a planning problem.
on day 60, you should also be running your promotion-adjusted forecast for the first time. Take your baseline sell-through projection, apply your planned discount multiplier by price elasticity tier, and recalculate reorder quantities. Your headline SKUs, the ones getting 25%+ discounts, typically see 2 to 3x the baseline unit velocity during the promotional window.
Day 30 (October 27): Domestic Safety Stock and Promo Finalization
Overseas orders are in transit. Now you're managing domestic suppliers and fine-tuning.
Three actions on day 30. First, place any domestic reorders with 2-3 week lead times. These are your fill-in orders, not your main stock. Second, confirm with marketing that promo depth is locked. Any discount changes after Day 30 require a reforecast and, if significant, a potential emergency order. Third, review your in-transit ocean freight ETA. If anything is running late, flag it now, not in three weeks.
Promotion-adjusted forecasting changes meaningfully between Day 60 and Day 30. By October, you have better signals: early holiday gifting trends, competitor pricing moves, your own email list engagement data from September campaigns. A 10% uplift in email list engagement from September to October has, in our data, correlated with a 6-9% increase in Black Friday conversion rate among existing customers. That signal matters for your top-of-funnel SKUs.
Seriously. If you haven't finalized your promo depth before day 30, you are flying without instruments for the most important 72 hours of your year.
Day 14 (November 14): Receiving Audit and Allocation
Ocean freight should be arriving or already landed. This checkpoint is about counting, not ordering.
Run a full receiving audit against your purchase orders. Verify unit counts, check for quality issues on a sample basis (minimum 5% of units per SKU), and flag any discrepancies to your supplier immediately. You have two weeks to resolve minor shortfalls before Black Friday. You have zero weeks if you discover a 300-unit shortage on November 27.
Allocate inventory across channels. If you're selling on Shopify, Amazon, and wholesale simultaneously, this is where you decide which channel gets priority stock. In our experience, brands that don't pre-allocate spend Black Friday manually adjusting listings when one channel oversells. That's a terrible use of the 48 hours you have.
Update your stockout thresholds in your replenishment system. Black Friday demand velocity is 3-5x your normal daily rate. Thresholds calibrated for September will trigger false alarms or, worse, miss real stockout risk during the event window.
Day 7 (November 21): Final Checks and Contingency
One week out. No new orders. This checkpoint is about verification and contingency planning.
Verify every high-velocity SKU is physically in the warehouse and scannable. Not "on the manifest," not "in receiving," but scanned, put away, and available in your WMS or Shopify inventory. We've seen brands lose $40,000 in Black Friday revenue because 200 units of their hero product were in a receiving queue that didn't process until Monday.
Build your stockout contingency list. For your top 10 SKUs by projected Black Friday revenue, identify what you'll do if they hit zero: substitute SKU, waitlist capture, or category page redirect. Having this documented in advance means you're executing a plan, not making panicked decisions at 11pm on November 28.
Check your promotional pricing in Shopify. Don't assume last week's test is still live. Check it. Then check it again the day before the sale goes live.
Day 0 (November 28): Execute, Don't Plan
Black Friday itself should be operationally quiet if you've done the work. You are monitoring, not deciding. Watch your sell-through rate by hour against your projection. If a SKU is tracking 40% above forecast by noon, consider whether to extend promo depth to drive volume or protect margin by pulling the discount early. That's the only real-time inventory decision you should be making.
Everything else was decided between August 27 and November 21.
The Core Principle: Decisions Move Forward, Not Backward
Here's the thing about Black Friday inventory planning: every checkpoint in this timeline is the last good moment to make a specific class of decision. Miss Day 60 and you've lost the ability to make a cost-effective overseas reorder. Miss Day 30 and you've lost the ability to adjust for updated promo signals without paying an air freight premium. Miss Day 14 and you've lost the ability to reallocate before the selling window opens.
The operators who consistently protect peak-season margin aren't the ones with the biggest budgets. They're the ones who understand that each checkpoint in this 90-day window is a one-way door. You can only walk through it forward.
Start on day 90. Set your baseline. Lock overseas orders on day 60 before you think you're ready. Your future self, standing in your warehouse on November 27 with full shelves, will not regret the August call you made.
