GA4 Audiences & Remarketing: How to Set Up Custom Audiences
Not every visitor is worth the same follow-up. Someone who abandoned a full cart is a very different opportunity than someone who read one blog post and left. GA4's audience-building tools let you group visitors by exactly this kind of behavior, then push those groups straight into Google Ads for targeted remarketing.
This guide covers how GA4 audiences work and how to set up a few of the most useful ones.
Key takeaways:
- GA4 audiences are built from combinations of events, parameters, and user properties, not just page URLs
- Audiences can sync directly to Google Ads for remarketing without extra tagging
- Cart abandoners, past purchasers, and high-intent non-converters are the three highest-value audiences for most businesses
- Audience membership takes time to populate, so campaigns shouldn't launch the same day an audience is created
- Over-segmenting into too many tiny audiences makes campaigns harder to manage and less effective
What Makes GA4 Audiences Different
In older analytics tools, audiences were often built around simple criteria like "visited page X." GA4 audiences can combine multiple events, sequences, and parameters — for example, "users who viewed a product page but did not complete purchase within 7 days." This lets you target based on actual intent, not just page visits.
Three High-Value Audiences Worth Building
| Audience | Definition | Why It Matters |
|---|---|---|
| Cart Abandoners | Triggered add_to_cart but not purchase within a set window | Highest purchase intent of any non-converting group |
| Past Purchasers | Triggered purchase at least once | Ideal for repeat-purchase or loyalty campaigns |
| High-Intent Non-Converters | Viewed pricing or key product pages multiple times, no conversion | Warm leads who need a nudge, not cold outreach |
Setting Up an Audience: Step by Step
1. Go to Admin > Audiences
In GA4, navigate to Admin > Audiences and select "New audience." You can start from a template (like "Purchasers" or "Cart abandoners," which GA4 provides by default) or build one from scratch.
2. Define the Conditions
For a custom audience, set the specific events and parameters that qualify someone for membership — for example, add_to_cart fired, followed by no purchase event within 7 days.
3. Set the Membership Duration
Decide how long a user stays in the audience after qualifying. Cart abandoners are often set to 7–14 days, while past purchasers might stay in an audience for 90 days or longer for loyalty campaigns.
4. Link GA4 to Google Ads
Under Admin > Google Ads Links, connect your GA4 property to your Google Ads account if it isn't already linked. This is what allows audiences to sync automatically for remarketing campaigns.
5. Give Audiences Time to Populate
New audiences don't fill retroactively — they only start collecting members from the moment they're created. Allow a few days of data collection before launching a campaign against a newly built audience.
Common Mistakes to Avoid
- Launching campaigns immediately: A brand-new audience may have too few members to run an effective campaign right away.
- Overlapping audiences without exclusions: Without exclusion rules, past purchasers can end up seeing "come back and buy" ads meant for new cart abandoners.
- Too many narrow audiences: Highly specific micro-audiences are hard to scale and can fragment your ad budget across too many small campaigns.
Frequently Asked Questions
Do GA4 audiences work without Google Ads?
Yes, audiences can also be used within GA4 itself for reporting and comparison, but their main value for most businesses comes from syncing to Google Ads for remarketing.
How long does it take for a new GA4 audience to be usable in Google Ads?
It varies, but audiences generally need a minimum number of members (often around 100 for search and shopping campaigns) before Google Ads will serve ads to them.
Can I exclude an audience from a campaign in GA4?
Audience exclusions are set up on the Google Ads side once the audience has synced from GA4, letting you prevent groups like recent purchasers from seeing acquisition ads.
Next Steps for Your Business
Well-built audiences turn generic remarketing into targeted follow-up that speaks to where someone actually is in their buying journey.
Our team can help set up GA4 audiences and connect them to your ad campaigns, so your remarketing budget goes toward the visitors most likely to convert.