Amazon Prime Day is Amazon's biggest members-only shopping event of the year, a multi-day sale packed with limited-time discounts on electronics, home goods, fashion, toys and thousands of other products. For anyone wondering 'when is Prime Day,' the short answer has changed dramatically since the event began: it launched as a single 24-hour sale on July 15, 2015, grew into a two-day event, expanded to four days in 2025, and shifted from July to June in 2026. This guide explains what Prime Day is, when it happens, how the deals work, and how you can shop and save.

What Is Amazon Prime Day?

Amazon Prime Day is an annual shopping event offering deals exclusively to Amazon Prime members. According to Amazon's own customer service, anyone can participate simply by becoming a member of Amazon Prime. The event is Amazon's answer to Black Friday, a manufactured shopping holiday that drives a huge surge of online spending during what would otherwise be a slow retail season.

The sale was originally created as a thank-you to Prime customers, launched on the eve of Amazon's 20th birthday. From the start, it doubled as a powerful customer-acquisition tool: the sale encourages shoppers to sign up for Prime, and once they join, they tend to keep the membership for the free shipping, streaming and other perks.

The deals span virtually every category Amazon sells, from its own devices such as Echo smart speakers, Fire tablets and Kindle e-readers, to products from millions of third-party and independent sellers. Prime Day 2020, for example, highlighted small businesses and produced record-setting sales for independent sellers.

When Is Prime Day? A Complete Timeline of Dates

Prime Day has never stayed in one place on the calendar. Here is how the dates have shifted over the years:

  • 2015: July 15, the first Prime Day, a 24-hour event celebrating Amazon's 20th anniversary.
  • 2016 to 2018: The event stayed in July, gradually stretching longer each year.
  • 2019: July 15 to 16, Prime Day became a 48-hour, two-day event.
  • 2020: October 13 to 14, Amazon delayed the event from July to October because of the COVID-19 pandemic.
  • 2021: The event shifted earlier, into June, for the first time.
  • 2022 to 2024: Prime Day returned to July; the 2024 event drove a record $14.2 billion in U.S. online sales.
  • 2025: July 8 to 11, Amazon doubled the days for the first time, running a four-day event.
  • 2026: June 23 to 26, Prime Day moved back to June, its first June event since 2021.

Beyond the summer Prime Day, Amazon now also holds a second fall sale called Prime Big Deal Days, often nicknamed 'October Prime Day.' It is typically a 48-hour event in early October aimed at early holiday shoppers. In 2026, Prime Big Deal Days was scheduled for October 6 and 7.

How Prime Day Deals Work

The mechanics of Prime Day revolve around several types of promotions. The most famous is the Lightning Deal, a limited-time offer on a select item that shows the discounted price, availability status and time remaining. Lightning Deals typically run for a few hours, often 4 to 12 hours, and are limited in quantity, so they can sell out quickly. Once a shopper adds a Lightning Deal item to their cart, they generally have a short window, often about 15 minutes, to complete checkout before the reserved deal expires.

Alongside Lightning Deals, Prime Day typically includes:

  • Deal of the Day: full-day discounts on specific products.
  • Coupons and percentage-off offers: discounts applied at checkout on top of everyday prices.
  • Exclusive device deals: some of the deepest discounts land on Amazon's own hardware.

To qualify for any Prime Day offer, a shopper must place the order while the deal is live and meet any qualifications listed in the deal.

How to Participate and Save

Because Prime Day deals are reserved for Prime members, the first step to participating is having a membership, or taking advantage of a free trial.

Amazon Prime costs $14.99 per month or $139 per year for a standard membership. Discounted tiers are available: students pay $7.49 per month or $69 per year, and eligible government assistance recipients pay $6.99 per month. New members, or anyone who has not been a member in the past 12 months, are typically eligible for a free 30-day trial, which is more than enough time to shop the entire event without paying anything.

Beyond Prime Day, the membership bundles free two-day shipping, Prime Video streaming, Amazon Music, Prime Reading and other perks, one reason many shoppers keep the subscription long after the sale ends.

Practical tips for getting the best deals:

  • Build a wishlist ahead of time so you can spot real price drops the moment the event starts.
  • Compare prices against other retailers, since not every Prime Day price is the lowest available.
  • Verify the discount by checking the product's MSRP on the brand's website or using price-tracking tools.
  • Watch for Lightning Deals throughout the day, since new deals appear continuously.
  • Set deal alerts on Amazon's 'Today's Deals' page so you don't miss short-lived offers.

The Numbers Behind Prime Day

Prime Day has grown from a modest experiment into one of the largest online shopping events in the world. The sales figures tell the story of that growth:

  • 2015: roughly $900 million in sales.
  • 2016: roughly $1.5 billion.
  • 2022: about $12 billion.
  • 2024: U.S. shoppers spent a record $14.2 billion online during the two-day event, up 11% year over year, according to Adobe Analytics.
  • 2026: overall U.S. ecommerce sales during the four-day event reached $26.4 billion, up about 9.5% year over year, with day one alone hitting $8.3 billion.

The event is also a membership engine. Analysts note that Prime Day reliably ranks among the biggest single days for new Prime signups each year, a key reason Amazon keeps expanding the event's length and reach.

What's Next for Prime Day

Prime Day continues to evolve. The move to four days in 2025 and the shift to June in 2026 suggest Amazon is experimenting with timing and length to capture more spending earlier in the year. The separate October Prime Big Deal Days gives Amazon a second major sales moment just ahead of the holiday season.

For shoppers, the practical takeaway is straightforward: the dates and length of Prime Day can change from year to year. The best strategy is to watch for Amazon's official announcement, usually a few weeks before the event, and to have a Prime membership or a free trial ready so you can shop the moment deals go live.

Quick Summary: Key Points to Remember

  • Prime Day is a members-only sale that began July 15, 2015, as a 24-hour event marking Amazon's 20th anniversary.
  • It has grown to four days, moving to June 23 to 26 in 2026, with a separate October event called Prime Big Deal Days.
  • Deals include Lightning Deals, Deal of the Day, coupons and deep discounts on Amazon devices.
  • You need a Prime membership to shop it, but a free 30-day trial works for new members.
  • Prime costs $14.99 per month or $139 per year, with discounts for students and government assistance recipients.
  • Prime Day 2026 drove $26.4 billion in U.S. online sales, its biggest result yet.