Yes, Google Ads requires a minimum audience size before your remarketing ads can start serving:
Minimum Size Requirements
Search campaigns: At least 1,000 active users in the audience list within the selected timeframe.
Display, Gmail, and YouTube campaigns: Minimum 100 active users in the audience list.
Customer Match audiences (based on email lists): Also require at least 100 matched users.
Why It Matters
If your audience is too small:
Your ads won’t serve, even if the campaign is approved.
Budget goes unspent due to lack of eligible users.
You may see a “Too Small to Serve” status in your audience segment.
Tips to Reach Minimum Size
Install the remarketing tag across all pages for maximum coverage.
Extend your membership duration (up to 540 days) to accumulate more users.
Promote high-traffic pages to boost visitor volume.
Consider combining similar user behaviors into one broader segment.
Reminder: Your remarketing list must also comply with Google’s privacy thresholds—no personally identifiable information (PII) and no sensitive content segments.
