GA4 Data Retention Settings: Why the Default Costs You 12 Months of Data

The Expensive Default Setting You Probably Haven't Changed

When you create a GA4 property, the default data retention period is 2 months. This means event-level data used in Explorations reports is deleted after 60 days. Standard reports (which use aggregated data) are unaffected and show all historical data — but any Exploration you build can only query the last 2 months of raw events.

The problem: most teams discover they need longer data access when they want to do a year-over-year analysis or investigate a trend from 4 months ago. At that point, the data is already gone — permanently. GA4 does not retroactively restore deleted data when you change the retention setting.

How to Change the Data Retention Setting

1. In GA4: Admin (gear icon, bottom left)
2. Under "Data Settings": Data Retention
3. Change "Event data retention" from 2 months to 14 months
4. Toggle ON "Reset user data on new activity" (this extends the retention window for active users)
5. Click Save

That is the entire change. It takes effect immediately and applies to all data going forward. Data already deleted (from the previous 60-day window) cannot be recovered.

What 14 Months Enables That 2 Months Does Not

• Year-over-year Explorations: build cohort analyses, funnel explorations, and path reports comparing this year to last year
• Long-tail attribution analysis: for products with long consideration cycles, trace conversions back to sessions from 3-6 months ago
• Seasonality analysis with event-level granularity: understand how specific events (not just sessions) behave across seasonal periods
• Debugging historical anomalies: when a metric suddenly changes, investigate what happened at the event level — even if the change was 8 months ago

Why 14 Months and Not More

14 months is the maximum available in GA4. Google's rationale relates to their GDPR commitments and privacy policy — they do not retain raw user-level event data indefinitely. The 14-month maximum gives you two complete calendar cycles (this month vs the same month last year) for trend analysis.

If You Need Longer Retention: BigQuery Export

If your business requires more than 14 months of event-level data (enterprise analytics, regulatory compliance, long-term cohort studies), enable the GA4 BigQuery export. BigQuery stores raw event data indefinitely at low cost. Once in BigQuery, you own and control the data retention policy.

Enable the export before you need it — it only captures data from the activation date forward. Every day without BigQuery export is a day of raw event data you lose permanently if you decide you need it later.

Summary

Change GA4 data retention to 14 months immediately after setting up your property. This is a 30-second change that prevents permanently losing 12 months of analytical capability. If you need longer-term event data, enable BigQuery export today. Both settings have no cost implications for the GA4 data retention change itself.

See our GA4 Setup & Audit service for complete property configuration.

Not sure your GA4 is configured correctly? Contact Adslytics.