Does Google Ads Set a Default Frequency Cap for Display Campaigns?

No — Google doesn't publish a numeric default frequency cap for Display campaigns. According to Google's own "Use frequency capping" help documentation, you choose between letting Google optimize how often your ads show to the same person, or setting your own manual limit; there's no stated out-of-the-box number of impressions per user.

Two Ways Frequency Gets Controlled

Google's documentation describes frequency management as a choice, not a fixed rule. The "Optimize" option hands control to Google's systems to manage impression frequency per user automatically. The alternative is a manual cap, which you set yourself at the campaign, ad group, or ad level — specifying a maximum number of impressions over a timeframe you define.

You Can't Set It When First Creating a Campaign

One detail in Google's documentation that catches advertisers off guard: frequency capping settings aren't available to adjust at the moment you create a new Display campaign. The "Frequency management" section lives in campaign settings and becomes editable only after the campaign exists, so a specific cap has to be configured as a follow-up step, not during initial setup.

What Actually Counts Toward a Cap

Per Google's documentation, only viewable impressions count toward frequency caps on Display campaigns. User tracking for this purpose relies on third-party cookies by default; where those aren't available, Google falls back to first-party cookies to approximate how many times a given user has seen the ad.

Where Frequency Capping Isn't Supported

Google's documentation also states that frequency capping isn't supported in Demand Gen campaigns — a distinction worth knowing if you're used to setting caps on standard Display or video campaigns and expect the same control to carry over to a Demand Gen asset group.

"Optimize" Still Manages Frequency — It Just Doesn't Publish a Number

It's worth separating two different ideas that often get conflated: "no default cap" doesn't mean "uncapped." The Optimize setting is Google's own algorithmic approach to frequency, actively managing how often each person sees your ads based on signals Google doesn't fully disclose. Choosing not to set a manual number means you're trusting that system rather than opting out of frequency management altogether. If your goal is a specific, predictable ceiling — say, for a brand campaign where overexposure is a real concern — Optimize isn't a substitute for a manual cap, since you have no visibility into what number it's actually targeting for your account.

Bottom Line

If predictable, controlled exposure matters more to you than Google's automatic optimization, don't assume a safe default is already applied — go into campaign settings after launch and set a manual frequency cap at the level (campaign, ad group, or ad) that matches how granularly you want to control it, and remember the cap only counts viewable impressions, so raw ad server logs won't match what Google is actually capping against.

Sources: Google Ads Help, "Use frequency capping" (support.google.com/google-ads/answer/6034106); Google Ads Help, "Frequency capping: Definition" (support.google.com/google-ads/answer/117579).