The summer CPM dip you're waiting for isn't coming
Set your floors now or overpay through the whole window.
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Too many brands are still waiting for CPMs to soften now that Prime Day is done…
This year that dip isn't coming, at least not the way it used to.
Prime Day landed June 23 to 26, later in the calendar than usual, and it's colliding directly with back-to-school buying that starts in early July.
The two events sit right on top of each other, and instead of the auction cooling off after June 26, it stays hot. Some reports have July CPMs running 15 to 25% higher instead of lower.
The post-event break you'd normally exploit is getting filled before it opens.
Pull your account's CPM trend for the last three weeks. Check whether it actually softened after June 26 or held.
Don't plan around the dip. Look at what your account is really doing.
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The Mechanic Behind the Squeeze
CPM is an auction. The price you pay is set by how many advertisers are bidding on the same people you want.
Big shopping events pull spenders in, everyone raises budgets to compete, and the clearing price climbs.
That part is normal and happens around every Prime Day.
What's different this year is the handoff.
The event that usually empties out the auction ended, but the demand that pulled everyone in didn't leave on schedule.
Back-to-school picked up the baton the same week, so the competition never got its usual gap to breathe.
Check your frequency and CTR alongside your CPM.
A rising CPM with climbing frequency points to saturation inside your own account.
That's a different beast from outside auction competition, and it won't cool off when the season does.
Those two problems have different fixes, so figure out which one you actually have before you touch a campaign.
Back-to-School Moved Up and Kept It Hot
This is the piece specific to 2026. Back-to-school shopping jumped forward hard.
Per the NRF, 67% of back-to-school shoppers had already started buying by early July, up from 55% a year earlier and the highest share they've tracked since 2018.
So it isn't only advertiser competition holding the auction up. Real consumer demand is live in July too.
The August lull buyers usually count on got pulled forward into the exact window everyone expected to go quiet and cheap.
If you sell anything adjacent to the back-to-school window, check whether your category competitors are already live.
Their spend is part of what's inflating your auction, and if they came in early, waiting them out stops being a plan.
The Margin Defense, Not a Retreat
The wrong move here is to disappear for July. The demand is real, and going silent hands the entire window to whoever stayed in.
The right move is to protect efficiency while you're standing in it.
> Set a floor. Decide the ROAS or CPA you're not willing to drop below and let that govern spend, instead of chasing volume into an auction that's charging a premium.
> Lean on the creative you already know converts rather than launching cold tests that need cheap impressions to learn.
> Keep your audiences broad, because narrow audiences and bottom-funnel objectives are where competition and cost run highest. Buyers who set their floors early tend to pay less across the window than the ones who wait and react to the damage in August.
> Set an efficiency floor on your top campaigns this week and name the two or three proven winners you'll ride through the window.
That's your July plan. Everything speculative waits until the auction cools.
The Decision to Run This Week
1. Confirm whether your July CPM actually rose or held. Don't assume the dip is coming just because Prime Day ended.
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2. Set a ROAS or CPA floor now, before you're reacting to a bad week in August with less runway to fix it.
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3. Concentrate spend behind proven creative. Pause cold tests until the window cools back down.
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4. Keep audiences broad where the objective allows it, to reduce how much auction competition you're absorbing directly.
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5. Stay live. The demand behind this window is real, and going silent just hands it to whoever's still bidding.
Final Thoughts
July is expensive this year whether you planned for it or not.
Prime Day moved later, back-to-school moved earlier, and the two are sitting on top of each other in the same auction right now.
You can set floors and ride your winners through it, or you can wait and figure out the cost in August once the damage is already sitting in the numbers.
The dip isn't coming. Plan for the window you actually have, not the one your calendar told you to expect.
If you want a growth partner who is invested in helping you build a profitable business, someone who is going to push you to make changes that focus on profitable growth. Book a call - let’s chat
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