September feels early to think about Black Friday. It isn't. The infrastructure that handles your BFCM volume needs weeks to set up correctly, and most of the failures store owners hit in November trace back to something they skipped in September.
Black Friday and Cyber Monday anchor a stretch that now runs from Thanksgiving through the following week, sometimes bleeding into all of December. For most Shopify stores, this window produces more traffic, more carts, and more abandoned carts than the rest of the quarter combined. A store that sends 2,000 recovery texts a week in October can hit 15,000 or more in the week after Thanksgiving.
That spike doesn't just test your promotions calendar. It tests every piece of infrastructure sitting between a shopper abandoning their cart and a text landing in their pocket.
Every A2P 10DLC number has a per-second and per-day sending limit set by the carriers, not by your SMS vendor. Those limits are tied to your registered brand and campaign, not to how badly you need to send more messages during a sale. If your registration was set up for steady-state volume, BFCM traffic can queue behind it. A message that should land within a minute of cart abandonment lands twenty minutes later, after the shopper already checked out somewhere else or closed the tab for good.
Fixing this after Thanksgiving weekend doesn't work. Carrier vetting and campaign registration take time, and vendors get backed up with everyone else's last-minute requests during the exact weeks you need them the most.
A small opt-in list with a sloppy consent flow is a minor risk. Blast that same sloppy flow at ten times the volume, and every gap in your consent capture, missed STOP handling, a pop-up that never actually wrote to Shopify, shows up ten times as often. Carriers watch complaint rates closely during peak season, since it's when spam volume spikes across the entire network. A store with a clean opt-in flow and consistent STOP/HELP enforcement rides through that scrutiny without issue. A store that's been quietly accumulating consent gaps all year finds out about them in the worst week possible.
It's tempting to increase send frequency during BFCM. More promotions, more reminders, more urgency. But frequency caps exist for a reason: shoppers who get texted too often during peak season opt out at a much higher rate, and that opt-out spike follows you into December and January. The stores that come out of BFCM with a larger, more responsive SMS list are the ones that held their frequency limits steady and let volume, not frequency, do the work.
Four things worth confirming before the second week of November, not after:
Every one of these fixes takes time that doesn't exist once the surge starts. A2P registration changes can take one to two weeks to clear carrier review. Testing an opt-in flow properly means running real transactions through it, not just eyeballing the checkout page. And once volume hits, there's no version of "we'll fix it live" that doesn't cost you carts.
CART's infrastructure is built for this kind of surge by default, dedicated numbers, automatic opt-out enforcement, and frequency limits that hold regardless of what the marketing calendar throws at them. If you want a second set of eyes on whether your current setup can handle BFCM volume, that's a conversation worth having in September, not a fire drill worth having in November.
Run your next 250 abandoned carts through CART, $0 charged, and see what it recovers before you commit to anything.
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