If you’ve searched “when is Prime Day 2026” anytime in the last few weeks, you’ve probably landed on a confusing answer. Summer Prime Day has already happened this year: it ran from June 23 to June 26. So if you’re a seller wondering what’s next on the calendar, you’re not asking about Prime Day. You’re asking about Prime Big Deal Days, Amazon’s fall event, and right now nobody outside of Amazon knows the exact dates. Prime Big Deal Days is Amazon’s exclusive October shopping event for Prime members, typically held in early to mid-October to kick off the holiday shopping season.
Here’s what we know, what we’re estimating, and what you should be doing right now to get ready for this big season.
Didn’t Prime Day already happen this year?
Yes. Amazon Prime Day 2026 ran its full four-day stretch from June 23 through June 26, across 23 countries. If you missed the recap, we broke down what happened, what sold, and what it meant for sellers in our Prime Day 2025 results and deals recap. The pattern held again this year, just with an earlier June date instead of the old mid-July slot.
Since 2022, Amazon has run two major Prime member sales events a year: one in early summer, one in fall. That fall event is Prime Big Deal Days, and it’s what most of the “upcoming Amazon Prime Day sale” searches this September are actually about.
What you must know about Prime Big Deal Days 2026
Amazon’s Prime sale is over for 2026, and now you need to be ready for the upcoming Prime Big Deal Days. Here are some important things every seller must know:
The historical pattern
Prime Big Deal Days has run in October every year since it launched in 2022, and the dates have consistently landed in the early-to-mid October window. That pattern is the best predictor we have right now.
Amazon’s official stance
As of this writing, Amazon has not published official dates for Prime Big Deal Days 2026. That’s normal: the company typically confirms dates only a few weeks out, which is exactly why sellers get caught scrambling every year. Waiting for the official announcement before you start prepping is, frankly, too late.
Our best estimate
Based on the last three years of Prime Big Deal Days dates, you can expect a two-day event sometime between early and mid-October 2026.
Why Prime Big Deal Days matters for sellers
Prime Big Deal Days isn’t Prime Day’s little sibling. It’s a distinct opportunity with its own shopping behavior. October shoppers are already thinking about the holidays, so categories like home goods, electronics, and gifting products tend to outperform where they sat back in June.
It’s also the revenue bridge between the back-to-school slowdown and the Black Friday and Cyber Monday rush. Sellers who treat it as an afterthought tend to walk straight into Q4 with the wrong inventory levels and ad budgets already stretched thin. We’ve discussed before why smart sellers partner with an agency before Prime Big Deal Days instead of managing both fall events solo. In short, the planning window is tighter than most sellers expect, and mistakes here compound straight through the holidays.
What worked during Prime Big Deal Days last year
A few patterns held up in past Prime Big Deal Days cycles that are worth planning around again this year. Sellers who had Lightning Deals and Coupons queued up well before the event consistently landed better placement than those scrambling in the final week, so submitting early paid off in a way it doesn’t always during summer Prime Day. Inventory shortfalls also hurt more in October than in June, because the event sits so close to the holiday inventory crunch: running out of stock mid-event doesn’t just cost you the sale; it can knock your listing’s ranking down right as Q4 traffic ramps up. And ad spend needed a different approach than summer Prime Day entirely. October shoppers convert differently than July shoppers, so campaigns carried over from the summer event without adjustment tended to underperform in the fall.
How sellers should prepare for Prime Big Deal Days 2026
Now that the basics of this upcoming opportunity are clear, let’s talk about how you should prepare for it:
- Audit your inventory now: Fulfillment centers get congested as Q4 approaches, and FBA processing times slow down the closer you get to October.
- Build your promotional calendar early: Lightning Deals, Coupons, and Prime Exclusive Discounts all have submission windows that close well before the event itself.
- Review pricing against your Q4 margins: A discount that made sense in June might not pencil out once you factor in holiday ad costs and shipping surcharges.
- Refresh your listings before the traffic spike hits: Update images, A+ Content, and backend keywords now. Avoid making changes mid-event, when algorithmic visibility is most sensitive to disruption.
- Set advertising budgets with a buffer: Cost-per-click typically climbs as more sellers compete for the same fall traffic. So budget for that instead of getting outbid halfway through the event.
- Plan your post-event follow-through. Sellers who treat Prime Big Deal Days as an isolated event, rather than the opening move of Q4, tend to lose momentum right when Black Friday and Cyber Monday traffic starts building.
Common mistakes sellers make before the fall event
The biggest one is assuming Prime Big Deal Days works like Prime Day. It doesn’t: different shopper mindset, different category winners, different ad dynamics. Right behind that is waiting for the official date before doing any planning, when by the time Amazon confirms, deal submission windows are already tight. Sellers also tend to under-forecast inventory needs, not realizing October stockouts are more costly than summer ones because they bleed into holiday ranking, and they’ll often copy-paste the summer Prime Day ad strategy even though what converted in June rarely converts identically in October without adjustment. The last one is subtler: ignoring the Q4 handoff. Prime Big Deal Days performance data is some of the best signal you’ll get heading into Black Friday and Cyber Monday, and a lot of sellers let it go unused.
The bigger picture: where this fits in Amazon’s 2026 sales calendar
Prime Big Deal Days is one stop on a much longer Amazon sale calendar. Sellers who plan around the full year tend to outperform those reacting to each event individually. Here’s how the rest of 2026 lines up around it:
| Event | Approximate timing |
| Amazon Prime Day 2026 | June 23-26 (already occurred) |
| Back to School Sale | August |
| Labor Day Sale | Early September |
| Prime Big Deal Days | Early-mid October (estimated) |
| Early Holiday Deals | Late October |
| Black Friday | Late November |
| Cyber Monday | Monday after Black Friday |
| Holiday Sale Period | Throughout December |
We covered a similar planning challenge earlier this year in our breakdown of the Amazon Big Spring Sale 2026, where the same “prepare for the estimated date, adjust once it’s confirmed” approach applied. And once Prime Big Deal Days wraps, the turnaround into Black Friday is fast, so our Black Friday sales data and 2025 strategy breakdown is worth revisiting as you start mapping that handoff.
Is Prime Big Deal Days worth it for sellers?
For most catalogs, yes, but the return depends heavily on how early you prepare. Sellers who go in with deals scheduled, inventory buffered, and ad budgets set in advance consistently see stronger returns than sellers who scramble once the dates are confirmed. If your bandwidth is already stretched heading into Q4, that’s usually the moment to bring in outside help with the help of a reliable Amazon growth partner rather than trying to manage two fall events (Prime Big Deal Days and the immediate run-up to Black Friday) entirely in-house.
Final recommendations for sellers
Don’t wait for Amazon’s official announcement to start moving. Treat early-to-mid October as your working target date, get your promotional calendar and inventory in order now, and build in enough flexibility to adjust once the real dates land. Every year, the sellers who come out ahead on Prime Big Deal Days aren’t necessarily the ones with the biggest budgets. They’re the ones who started planning while everyone else was still waiting on Amazon.
FAQs
Is Amazon having another Prime Day in 2026?
Not another “Prime Day” exactly, but yes: Amazon’s fall event, Prime Big Deal Days, is expected in October 2026. Amazon has run this second event every year since 2022.
When is Prime Big Deal Days 2026?
Not officially confirmed yet. Based on the pattern from 2022 through 2025, expect early-to-mid October 2026.
How long does Prime Big Deal Days last?
Past events have run for two days, shorter than the four-day summer Prime Day event.
What’s the difference between Prime Day and Prime Big Deal Days?
Prime Day is the larger summer event, with four days and a broader category mix. Prime Big Deal Days is the fall counterpart: shorter, more holiday-gifting-focused, and aimed at bridging the gap into Black Friday and Cyber Monday.
Do sellers need to do anything special to participate?
Yes. Deals need to be submitted through Seller Central well ahead of the event, and inventory needs to be positioned in FBA before submission deadlines close. Waiting until the dates are confirmed is usually too late.
Is Prime Big Deal Days worth it for sellers?
For most sellers, yes, provided preparation starts early. The sellers who see the strongest results are the ones who treat it as the opening event of Q4 planning rather than a standalone sale.