Google Ads reporting is about to become a little less forgiving for anyone who treats the platform as a permanent archive. From 1 June 2026, Google says Google Ads and related measurement APIs will move to a new data retention policy for historical performance statistics. The short version is that detailed reporting data will not remain available forever in the interface or through APIs.
For many small and mid-sized advertisers in Bath, Bristol, Somerset, Wiltshire, Dorset and Gloucestershire, this may sound like a technical back-office change. It is not quite that. If you use Google Ads data to understand seasonal demand, compare this year with several years ago, explain why lead costs changed, or audit old campaign decisions, the data you can pull directly from Google may narrow over time.
That makes this a good moment to check what you already have saved, what your reports depend on, and whether your marketing data lives in your own system or only inside Google’s.
What Google is changing
Google’s Ads Developer Blog announcement, published on 1 May 2026, says the new policy starts on 1 June 2026. Granular performance statistics, including daily, hourly and weekly data, will move to a 37-month retention window. Higher-level monthly, quarterly and yearly data will continue to be available for 11 years.
Search Engine Journal’s summary of the update also notes the practical consequence for advertisers: after the relevant retention period has passed, older data will no longer be accessible through the Google Ads interface or APIs. That matters because the most useful explanation for a performance shift is often hidden in the detail, not in a neat monthly total.
For example, a local business might want to know whether a poor April came from fewer searches, weaker conversion rates, a tracking issue, budget limits, competitor pressure, or one unusually expensive week. Monthly figures can point you in the right direction, but daily and weekly data often explains what really happened.
Why local advertisers should care
Most local businesses do not need to hoard every advertising datapoint forever. But some historical detail is genuinely useful. A hotel, visitor attraction, university service provider, professional firm, ecommerce retailer or local trades business may have several years of seasonal patterns in its Google Ads account. Those patterns can help with budgeting, staffing, promotional timing and sensible expectations.
If your campaigns have run for years, older daily and weekly data can also help answer awkward but important questions. Did enquiry quality drop after a landing page change? Did a new bidding strategy really improve performance, or did it simply coincide with a stronger season? Were last summer’s leads cheaper because the campaign improved, or because the market was quieter?
Those are not vanity questions. They affect decisions about budget, targeting, landing pages and lead handling. They also matter for businesses that work with an agency, change provider, bring marketing in-house, or need to explain spend to directors, trustees or finance teams.
This is where Google Ads management and wider search marketing become less about pressing buttons in an ad account and more about keeping a reliable record of what happened.
The BigQuery warning is worth noticing
Google’s announcement also flags a specific point for BigQuery Data Transfer Service users. It says that from 1 June 2026, the Google Analytics 4 connector will stop populating data for backfill runs with dates older than 37 months from the current date. Existing data already transferred and stored in BigQuery will remain in the tables. However, manually triggering a transfer for an older report date could overwrite that date’s data with empty values.
That is a technical detail, but it is an important one for businesses that rely on dashboards or data warehouses. A dashboard is only as good as the data behind it. If old data has never been exported, or if a careless backfill empties a historical table, the report may look tidy while quietly losing context.
For smaller organisations, this may simply mean asking whoever manages reporting a few direct questions. Are we storing Google Ads history outside Google Ads? How far back does our detailed data go? Are dashboards using saved tables, or do they query the live platform each time? Do we know what would happen if older data stopped being available?
What to check before 1 June
The safest response is not panic. It is a calm export and reporting review. Before 1 June 2026, advertisers should decide what level of history they may reasonably need and make sure it is stored somewhere they control.
- Export daily and weekly performance data for campaigns, ad groups, keywords, search terms and assets where that history may be useful.
- Check conversion, cost, impression, click and value data for important time periods, especially seasonal peaks.
- Review Looker Studio, Power BI, spreadsheet or agency reports to see whether they depend on fresh API calls for old data.
- If BigQuery is in use, confirm which tables already hold historical data and avoid careless older backfills after the policy change.
- Save notes about major campaign changes, tracking changes and business events, because numbers without context are easy to misread.
For many Bath and South West businesses, this does not need to become a large data project. A well-structured export of the most important campaign history may be enough. The key is to do it deliberately rather than discovering the gap later, when someone asks a reasonable question and the detail is no longer available.
Good reporting needs ownership
This update is also a reminder that advertising platforms are not neutral filing cabinets. They are tools for running campaigns now. They can change what they store, how they report it, and how long they make it available. If a number is important to your business, it is worth owning a copy of it.
That does not mean every local advertiser needs a complex data warehouse. It does mean your reporting setup should match the importance of the decisions being made from it. If Google Ads drives a meaningful share of your enquiries or sales, your historic data is part of your business memory.
It is also worth connecting this to broader digital marketing strategy. Useful measurement is not just about this month’s dashboard. It is about knowing what changed, why it changed, and what to do next. Keeping enough historical data makes that much easier.
The practical takeaway
Google’s new retention policy is unlikely to affect every advertiser equally. If you only look at recent results and have no need for older detail, it may pass with little drama. But if your business depends on year-on-year comparison, seasonal planning, long-running campaigns or accountable reporting, the 37-month window for granular data is worth acting on now.
The sensible move is simple: check what data you rely on, export what you may need, and make sure your reporting history is not dependent on Google Ads remaining an unlimited archive. Future-you, trying to explain why a busy summer did or did not repeat, may be very glad you did.
Sources:
Google Ads Developer Blog — New Data Retention Policy for Google Ads starting June 1, 2026
Search Engine Journal — Google Ads Will Limit Access To Older Reporting Data
