How to Use Observation Audiences in Google Search Campaigns for Better Results

If you’re running Google Search campaigns and you’re not using observation audiences, you’re leaving valuable optimisation opportunities on the table.

Observation audiences allow you to collect detailed data about who is actually clicking and converting on your ads — without narrowing your targeting or restricting reach.

What Are Observation Audiences in Google Ads?

In Google Ads, you can add audiences to your campaign or ad group in two ways:

1. Targeting – Your ads will only show to people in the selected audience.
2. Observation – Your ads still reach everyone, but you can see performance broken down by audience segments.

For Search campaigns, observation mode is a powerful tool because it gives you actionable insights without affecting delivery.

Why Add Observation Audiences to Every Campaign

From day one of a new campaign, make it a habit (or even a rule) to add all relevant observation audiences.

This helps you see which segments are engaging and converting, even if you’re not actively targeting them. Examples include:

• In-market shoppers – People actively researching products or services like yours
• Affinity audiences – People with long-term interests in a category
• Custom segments – Built from your own data or competitor keywords
• Remarketing lists – Past website visitors
• Competitor-intent audiences – Users showing interest in competing brands

How to Optimise Using Audience Data

Every 2–3 months (depending on your budget), review your audience performance:

• Pause or exclude underperformers to reduce wasted spend
• Increase bids for strong performers to capture more conversions
• Split out high-performing audiences into their own campaigns or ad groups for tailored messaging and bidding

Pro tip: If you’re using Smart Bidding (e.g. Maximise Conversions, Target CPA), your manual bid adjustments might be ignored — but the audience data still feeds the algorithm for smarter targeting.

Real-World Results

We’ve reduced cost-per-lead by over 400% for some clients by implementing this exact approach. By letting the data guide optimisation, campaigns become leaner, smarter, and more profitable.

The Takeaway

Observation audiences are one of the most underused Google Ads optimisation tools. They cost nothing to add, don’t limit your reach, and give you rich data to improve performance over time.

If you want to get more from your Google Search campaigns, make observation audiences part of your Google Ads optimisation toolkit.