What is First User Campaign in Google Analytics 4?

When you look at your campaign reports in Google Analytics 4, you might notice two very similar dimensions: ‘First user campaign’ and ‘Session campaign’. It’s a common point of confusion, and it’s easy to dismiss them as the same thing. But understanding the difference is key to getting the complete picture of how an actual person, not just a visit, found their way to your business. This article will break down exactly what the 'First user campaign' dimension represents, why it matters for your marketing strategy, and how to use it correctly in your GA4 reports.

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What Exactly is the 'First User Campaign'?

Think of the 'First user campaign' as the origin story for each user. It’s the very first marketing campaign that Google Analytics credited with bringing a new visitor to your website or app. Once that first-touch campaign is recorded for a user, it stays with them for their entire lifetime in GA4 (or until their data retention period expires).

Every subsequent visit they make, whether by clicking a different retargeting ad, a social media post, or an email link, will not change their 'First user campaign' value. That initial touchpoint is locked in. It answers the fundamental question: "Which of my marketing efforts are best at introducing brand-new people to my business?"

For this to work effectively, you must be using UTM parameters on all your campaign URLs. Without them, Google Analytics can’t correctly identify the campaign and will lump that traffic into a less helpful category like 'Organic Search' or '(direct)'.

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A Practical Example

Let's imagine a potential customer’s journey:

• Monday: Sarah is scrolling through Instagram and sees your ad for "Spring Sale 2024." She clicks it, browses your site for a few minutes, but doesn't buy anything.
• Wednesday: She remembers your brand and searches for it on Google. She clicks the first organic result, lands on your homepage, and signs up for your newsletter.
• Friday: Sarah receives your weekly newsletter with a special offer. She clicks the link in the email, returns to your site, and finally makes a purchase.

In this scenario:

• The First user campaign for Sarah will forever be "Spring Sale 2024" because the Instagram ad was her very first point of contact.
• The campaign credited with the session where she signed up would be 'Organic Search'.
• The campaign credited with the session where she purchased would be 'Weekly Newsletter'.

This reveals the crucial difference: the First User Campaign tells you what found you the customer, while other dimensions tell you what brought them back or prompted a specific action.

‘First User Campaign’ vs. ‘Session Campaign’

This is where most of the confusion happens. While they sound similar, they measure two very different aspects of the customer journey. One is about beginnings, and the other is about recent interactions.

Here’s a simple way to remember it:

• First User Campaign: The campaign responsible for the first time a user ever visited. It's focused on the user's acquisition source. Answering: "How did we acquire this visitor?"
• Session Campaign: The campaign responsible for the specific visit you are analyzing right now. It can change with every new session. Answering: "How did this visitor arrive this time?"

Imagine you're tracking your personal relationships. The 'First user campaign' is how you met your best friend (e.g., "college class"). Every time you see them after that, the method might be different ("texted me," "ran into them at the store,” etc.) - each of those would be a 'Session campaign.' But how you originally met never changes.

Looking at both is essential for a complete strategy. If your "brand influencers" campaign has a huge number of ‘First users’ but your "email marketing" campaign drives more converting ‘Sessions,’ you know that one is great for finding new customers and the other is great for closing them.

Why Is This Metric So Important?

Focusing only on the campaigns that drive immediate conversions (last-click attribution) can give you a skewed view of your marketing performance. It often over-credits channels at the end of the journey, like brand search and email, while undervaluing the top-of-funnel efforts that introduced the customer in the first place.

Here’s why tracking the ‘First user campaign’ is critical:

1. True Top-of-Funnel ROI: It shows you which channels and campaigns are effectively expanding your audience base. A campaign might have a low number of direct conversions but be your number one source of new users who convert later. Ignoring this metric might lead you to mistakenly cut the budget for a highly effective awareness campaign.
2. Better Persona Development: By analyzing the behavior of users acquired from different campaigns, you can build more accurate customer profiles. Are users from Facebook Ads more engaged than users from TikTok campaigns? Do they look at different products? This insight helps tailor your future content and ad creative.
3. Informed Budget Allocation: It allows you to create a balanced marketing ecosystem. You can allocate resources to campaigns designed for discovery (first user) and others designed for nurturing and conversion (session), knowing they serve different but equally important roles.

How to Find and Use the 'First User Campaign' Metric in GA4

Don't worry, finding this report is straightforward. Google Analytics 4 centers its acquisition reports around these concepts.

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Step 1: Navigate to the Acquisition Reports

In your GA4 property, go to the left-hand navigation panel and click on Reports. From there, open up the Acquisition section.

Step 2: Choose the Right Report

You have two main acquisition reports: User acquisition and Traffic acquisition.

• Click on User acquisition. This report is built around first-touch dimensions by default.

Step 3: Analyze the 'First User' Dimensions

The User acquisition report defaults to showing you data grouped by the ‘First user default channel group.’ This is a great starting point, but you’ll want to see the specific campaign names.

To change this:

• Click the small dropdown arrow next to the primary dimension (which is likely 'First user default channel group').
• In the search box that appears, type "First user" to filter the options.
• Select First user campaign from the list.

The report will now repopulate with all of your campaigns and the number of new users each one has brought in. From here, you can see not just the quantity of new users but also analyze their longer-term value by looking at metrics like Engagement rate, Conversions, and Total revenue associated with them.

Going Deeper with Secondary Dimensions

To get even more context, add a secondary dimension. Click the small blue "+" icon next to the primary dimension dropdown.

Some useful secondary dimensions to pair with 'First user campaign' include:

• First user source / medium: To see the specific platform (e.g., google / cpc, facebook / paid) that delivered the campaign.
• Device category: To see whether a campaign is more effective at acquiring new users on mobile or desktop.
• Country: To see where your top-performing acquisition campaigns are resonating most.

Common Pitfalls and Best Practices

To get the most out of this metric, keep a few things in mind.

1. Consistent UTM Tagging Is Non-Negotiable

The 'First user campaign' dimension is only as good as your data. Inconsistent UTM tagging (e.g., using "Facebook Ad" one day and "facebook_ad" the next) will split your data into different rows, making it impossible to analyze accurately. Establish a clear, consistent naming convention for utm_campaign, utm_source, and utm_medium and stick to it.

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2. Understand Attribution Settings

The conversions and revenue you see in the User Acquisition report are credited based on your property's attribution model (you can find this under Admin > Attribution Settings). The default is a "Data-driven" model, which assigns credit across multiple touchpoints. Be aware of your settings, as this influences how much "credit" your first-touch campaigns receive for conversions that happen later.

3. Look Beyond Volume

Don't just chase the campaign that brings the most new users. Analyze what those new users do. A campaign might bring 10,000 new users who leave immediately, while another brings 1,000 users who become loyal, paying customers. Focus on the campaigns that acquire valuable users by tying your analysis to downstream metrics like engagement rate, purchases, and lifetime value.

Final Thoughts

Getting a handle on the ‘First user campaign’ dimension in GA4 lets you see beyond a single session and understand the full story of your customer acquisition. It's the metric that proves the value of your top-of-funnel marketing, showing which efforts are truly expanding your audience and filling your pipeline for future growth.

At Graphed, we feel that digging up these valuable insights shouldn't require clicking through layers of menus and reports. We built our tool to help you get answers instantly. Instead of hunting for the User Acquisition report and manually changing dimensions, you can simply connect your Google Analytics account and ask a question like, "Which campaigns brought in the most new users last month and what's their engagement rate?" We’ll create a live dashboard with the answer in seconds, so you can spend less time wrangling data and more time acting on it.