Amazon Prime Day is Amazon’s flagship sales event for Prime members, and it now runs twice a year. The main summer event fell on June 23 to 26 in 2026, and Prime Big Deal Days landed on October 6 and 7. Sellers usually call the October edition October Prime Day or fall Prime Day. Both events concentrate months of demand into a few days, which means traffic spikes, aggressive competitor discounting, and outsized pressure on Buy Box, inventory and listing stability.
The Two Prime Day Events
The summer event is the bigger of the two, by volume and by shopper attention. It ran for 48 hours in mid-July for most of its history, then moved to four days in 2026. The month isn’t stable year to year, so check the announcement rather than assuming July. Our Prime Day seller guide covers it in full.
The October event is Prime Big Deal Days. Amazon positions it as the opening of holiday shopping, and the buying intent shows it: shoppers arrive to buy gifts and stock up rather than to browse. That changes which of your ASINs matter. The Prime Big Deal Days guide covers the seller side.
- The naming: Prime Big Deal Days is Amazon’s official name. October Prime Day, fall Prime Day and Prime Early Access Sale all point at the same October event.
- Where each runs: Prime Big Deal Days ran in 22 countries in 2026 and India was not one of them. amazon.in runs the Great Indian Festival from October 8 instead.
What doesn’t change is the part that costs money. Both events are Prime-member exclusive, both use the same deal formats, and both put the same pressure on a listing nobody is watching.
Why It Matters for Sellers
Prime Day compresses months of demand into a few days. Sellers with well-prepared Deal submissions and adequate FBA stock can meaningfully accelerate BSR, review velocity, and organic ranking.
Go into either event without inventory cover, without deal eligibility or without monitoring in place, and the failure modes are predictable. Sellers lose the Buy Box during the surge, run out of stock mid-event, or find a hijacker on the detail page just as traffic peaks. The upside is real, but so is the downside of an unmonitored listing on the day of maximum traffic.
How Amazon Prime Day Works
- Amazon announces the event window, typically several weeks in advance, and opens Deal submission windows for Lightning Deals, Prime Exclusive Discounts, and Best Deals.
- Sellers submit deals through Seller Central; Amazon reviews for eligibility based on price history, star rating, inventory depth, and category rules.
- During the event, deals surface across the event landing page, category pages, search, and personalized recommendations for Prime members.
- Traffic and conversion spike, ad CPCs rise sharply, and organic ranking recalibrates against the elevated sales velocity.
- Post-event, sellers see a “halo” period of elevated organic traffic and reviews, often lasting two to four weeks.
Deal Eligibility and Best Practices
- Amazon evaluates star rating (usually 4.0+ required for featured deals), price history (the discount must beat recent lows), and inventory cover.
- Submit deal candidates as early as the window opens: Amazon caps deal slots per category.
- Each event has its own submission cycle, so being selected in the summer says nothing about October.
- Model landed cost with the promo discount applied; a heavily discounted unit that stocks out mid-event stops earning halo lift.
- Prepare a Buy Box defense plan: hijackers often surface during promo surges to skim demand.
- Coordinate PPC bids and Sponsored Brands creative for the event; auction pressure spikes and unadjusted campaigns burn budget without lift.
How SellerSonar Helps
- Ranking Monitoring tracks BSR and keyword position swings during and after the event so you can measure real halo lift.
- Buy Box & Pricing Alerts fire the moment a competitor or hijacker takes the Buy Box on a deal ASIN.
- Product Monitoring catches suppression, image, and title changes that would silently kill a live deal.
Start your free SellerSonar trial today. New users can also take 20% off any plan, monthly or annual, with the code OctoberPrime20 at checkout. The offer runs for October Prime Day only, Amazon’s Prime Big Deal Days on October 6 and 7, 2026, and the code stops working after October 7.
Related Terms
- Lightning Deals, the time-boxed deal format both events lean on
- Discount Alerts, the tool for tracking competitor price drops through the event
- Amazon’s Choice, the badge many deal listings compete for after a Prime Day surge
- Subscribe and Save, the recurring-purchase promo that pairs well with Prime Day acquisition