the timeline nobody updated their Q2 plan for
Amazon Prime Day has run in July every year since 2015. Not this year. Prime Day 2026 is confirmed for June — Amazon's official announcement put it as the week of June 15 or 22. That's a four-to-six week pull-forward compared to every previous edition.
Today, May 27, was the cutoff for Amazon Warehousing and Distribution shipments to arrive with minimal splits for Prime Day. Sellers using FBA who missed this window still have options, but they're paying for expedited logistics. On the advertising side, the deadlines are softer — but the consequences are real.
Most Q2 media plans were written in March or April. Most of them assumed a quiet June. They were wrong.
what the CPMs actually do
In the two weeks before Prime Day 2025, Meta CPMs ran roughly 9% below typical levels. Brands pulling back spend ahead of the event created a brief trough of lower competition. Then the event started and CPMs spiked nearly 60%. CPA on social campaigns climbed 18% for brands that kept running unchanged through both phases.
Google Search CPCs in commerce-adjacent categories rose 20–40% on the Prime Day days themselves. The mechanism is straightforward: Amazon sellers don't pause their Meta and Google campaigns during the event — they add Prime Day spend on top of existing budgets. Everyone already in the auction pays more for the same impressions.
This year has a compounding problem. The FIFA World Cup kicks off June 11 — the same window when Prime Day CPM pressure starts building. As we covered last week, that tournament brings $10.5 billion in incremental global ad spend flooding digital auctions. Prime Day lands on top of it. Broad-audience Meta campaigns in the third week of June will be competing against both events at the same time.
the choice depends on where you sell
If you're an Amazon seller, the decision is relatively clear. Prime Day drives massive conversion rate spikes on-platform, and shoppers come already in deal-hunting mode. Brands that route external paid media toward their Amazon listings during Prime Day — rather than their own DTC site — tend to outperform those running standard campaigns. In 2025, social channels drove a 7.9x greater halo effect on Amazon sales compared to direct-to-consumer sales.
If you don't sell on Amazon, Prime Day is a different problem entirely. Your competition may be running deals on Amazon. Shoppers in deal-hunting mode are more likely to comparison-shop and bounce. Running your standard campaigns unchanged into a spiked-CPM environment, against an audience with part of its attention pulled toward Amazon, is a reliable path to a bad June ROAS retrospective.
The better play for non-Amazon DTC brands is a counter-promotion — not a panic discount, but a framing that captures deal-mode intent. "Direct pricing, no membership required" has worked in previous cycles. "Our version of Prime Day" has worked. The offer needs to exist before the event starts, not as a reactive scramble on June 15.
the window you have right now
The pre-event trough is real and it's now. From today through roughly June 8–10, auction prices are still at normal or slightly below-normal levels. If your current campaigns are working — proven creative, clean conversion tracking, stable ROAS — this is a legitimate window to push additional budget through what's already performing.
After June 10, two paths make sense. You can schedule 20–30% budget reductions during the highest-volume auction windows, using ad scheduling on both Meta and Google. Or you can run a counter-deal campaign that justifies paying higher CPMs with a stronger offer and elevated conversion rate. Doing nothing is the worst version.
Before scaling, it helps to know exactly where your accounts are leaking efficiency today — before Prime Day CPMs make the same problems more expensive. Gromerce's free audit tool takes three minutes and shows you the specific gaps in your setup.
Three weeks is tight. The brands that come out of June with acceptable efficiency will be the ones that planned in May.
Sources: Amazon Seller Central, About Amazon, Accelerated Digital Media, Strike Social, WARC, May 2026
