What do you do if your traffic drops after a Google core update?

Several times a year, Google makes broad changes to its search systems and calls them core updates. If your traffic dropped in the same days as an update, the first job is to measure whether the drop really comes from the update; a technical problem, a security warning or the season can draw the same graph. This guide sets out the order of checks based on Google’s own documentation and includes the 2026 update calendar.

What is a core update?

By Google’s definition, broad changes to its search algorithms and systems made several times a year. They do not target specific sites or pages; they are a reassessment of the systems as a whole as content on the web changes. Google compares this to refreshing a list of “favorite restaurants” written a few years ago: new places join the list, some change positions, and a restaurant that moves down does so not because it is bad but because others have moved ahead of it. According to Google, most sites are not affected by a core update and may not even notice that one has happened.

Which updates have there been in 2026?

Google publishes the announced updates that affect ranking on the Search Status Dashboard, with their start date and duration. As of October 30, 2026, the list for 2026:

1. May 2026 core update · May 21 · 11 days 21 hours
2. March 2026 core update · March 27 · 12 days 4 hours
3. Spam updates · March 24 (19 hours 30 minutes) · June 24 (2 days 1 hour) · August 18 (2 days 16 hours) · September 24 (13 days 16 hours)
4. Discover update · February 5 · 21 days 17 hours
5. The previous core update: December 2025 · December 11 · 18 days 2 hours

Spam updates are not core updates; they target practices that violate Google’s spam policies. The Discover update concerns only the Discover feed. Google says it also makes smaller core updates that it does not announce, so ranking movement on a date that is not on the list is not unusual. For the current list, check the dashboard itself.

Is the drop really caused by the update?

Google’s guide to traffic drops lists five other causes besides an algorithm update, and each one has a place to look in Search Console:

• Technical issue: the server being unavailable, robots.txt that cannot be read, an accidentally added noindex. Look for a spike on the same date in the Crawl stats and Page indexing reports; the details are in the guide to a site not showing up on Google.
• Security issue: if malware or phishing is detected, Google may warn visitors before they enter the site, and traffic drops. Check the Security issues report; the preventive side is covered in the website security checklist.
• Spam: if automated systems or a review find that the site violates the spam policies, its ranking may drop. Check the Manual actions report.
• Seasonality and interest: demand itself may have dropped. Filter the queries that bring the most traffic one by one in the Performance report, and check in Google Trends whether the same drop is happening across the web.
• Address change: if your pages’ addresses changed, Google’s recrawl can take a few weeks for a medium-sized site; if the drop persists, go back to the site redesign checklist.

There is also the possibility of a reporting error: Search Console’s data anomalies page tells you whether the drop comes from a logging or processing error.

Which weeks should you compare?

The order Google recommends is this: first confirm on the dashboard that the update has finished, and note its start and end dates. Wait at least one full week after the end; then compare that week with a week before the update began. Look at web, image, video and news search separately.

For the May 2026 update, which started on May 21 and ended in the first days of June, this means comparing a week starting on June 9 at the earliest with the week of May 14–20. A measurement taken while the update is still running measures a change that is only half done.

A small drop or a large drop?

Google tells the two apart with examples. Dropping from position 2 to position 4 is a small drop: no drastic intervention is needed, and Google in fact recommends not changing content that is already performing well; small fluctuations may also reverse without you doing anything. Dropping from position 4 to position 29, or falling out of the top ten results across a wide range of queries, is a large drop: then you need to assess not individual pages but the site as a whole, using Google’s self-assessment questions, for whether it is helpful, reliable and written for people first. Google recommends also having this done by someone with no connection to the site, and comparing the most affected pages with pages that help better in the same search. How to read your position is explained in the guide to checking your position on Google.

If impressions stayed the same and only clicks dropped, the problem may not be ranking: in that case, Google suggests considering whether the title and description describe the page well enough, or whether other sites show a more attractive rich result. If AI Overviews appear for your queries, Search Console’s generative AI report, added in 2026, counts this as impressions; it does not report clicks.

What should you change, and what should you leave alone?

Google’s warning is clear: avoid “quick fixes”, such as removing a page element because you heard it is bad for SEO. Make changes that are meaningful and lasting for the reader, such as rewriting content or reorganizing it so that it is easier to read and navigate. Deleting content is a last resort; according to Google, if you are considering deleting entire sections, those sections were most likely written for search engines first, and removing them may help the site’s good content.

When do you see the effect?

Some changes take effect within a few days; for Google’s systems to decide that the site as a whole produces helpful content over the long term, however, can take a few months. If there is still no effect after a few months, you may need to wait for the next core update, but unannounced smaller updates can also bring the recovery. As Google itself puts it, there is no guarantee: rankings are not static, and as the web changes there are both gains and losses.

The calendar helps set expectations: there were about three and a half months between December 2025 and March 2026, and about two months between March and May. As of October 30, 2026, no new core update has been announced since May.

Checklist

1. Date · does the drop coincide with an update, and has the update finished (Search Status Dashboard)
2. Technical · is there a spike on the same date in the Crawl stats and Page indexing reports
3. Security · is the Security issues report empty
4. Spam · is the Manual actions report empty
5. Interest · have the same queries also dropped in Google Trends
6. Addresses · have your pages’ addresses changed
7. Comparison · at least one week after the end, against a week before the start
8. Size · leave a small drop alone; after a large one, assess the site as a whole
9. Clicks · impressions the same, clicks down: the title and description
10. Changes · no quick fixes; deletion as a last resort
11. Patience · the effect takes days to months; no guarantee

This guide was written as of October 30, 2026, based on Google’s documentation and the update dashboard; the calendar changes with every new update. If you would like to read your site’s drop together with its Search Console data, write to us.

If you want to find out together why your site doesn’t show up on Google, SEO consulting audits every layer from crawling to indexing and makes the fix in the source code.