Google March 2018 Core Update (8 March 2018): What Changed and How to Recover

The Google March 2018 core update was a broad core algorithm update that rolled out in the week before Google confirmed it on 12 March 2018; it is commonly dated 8 March 2018. Sistrix describes it as the first update Google officially called a "core update". Google’s message was that nothing was being punished: some pages that had been under-rewarded moved up, and there was no specific fix for pages that fell.

This article is part of my full list of Google algorithm updates.

Detail	Information
Update name	March 2018 core update (nicknamed "Brackets")
Type	Broad core update
Rollout started	Week before 12 March 2018 (Wikipedia: 8 March; Ignite: 9 March)
Rollout finished	Not announced
Rollout length	Not announced
Confirmed by Google	Yes, on 12 March 2018
Official source	Search Engine Land: Google confirms core update

What the March 2018 core update changed

Google did not point to a single factor. It said it releases broad core updates several times a year, and that this kind of update benefits pages that were previously under-rewarded. The corollary is that other pages move down, not because they did anything wrong, but because something else is now judged more relevant.

Google’s own words set the tone for every core update since: "There’s no ‘fix’ for pages that may perform less well other than to remain focused on building great content."

The update matters historically for its label. Sistrix describes it as the first update Google officially called a "Core Update". From this point, Google began announcing broad changes in a consistent way, which helps site owners match ranking shifts to known dates. Glenn Gabe nicknamed it "Brackets".

Timeline

• About 8 March 2018: rollout begins, per Wikipedia. Ignite lists 9 March.
• 12 March 2018: Google confirms that a broad core update was released the previous week. Sistrix and Search Engine Land date it to 12 March.
• 16 April 2018: the next broad core update arrives, about five weeks later.

Because sources use different dates, compare a range rather than a single day when you analyse your data.

Who was affected

No category was targeted. Changes were spread across many sites and query types. That is typical of core updates and different from targeted updates such as Penguin or the interstitial signal, where the pattern points at a specific behaviour. It also means "my competitor went up, so they must have done X" is often the wrong conclusion. Core updates reassess relevance broadly.

How to tell if the March 2018 core update hit your site

The key with this update is distinguishing a relevance reassessment from a technical problem, because both can look like a sudden drop.

1. Use a wide window. Compare 22 February to 7 March 2018 with 13 to 27 March 2018. This covers the uncertainty about the exact start date.
2. Look at positions, not just clicks. Core update losses usually appear as a slide of a few positions across many queries. A collapse to zero on a set of URLs points to indexing or technical issues instead.
3. Check whether winners and losers swapped. For your main queries, see what moved above you. If the new results answer the query more directly or with more depth, that is the core update reassessing relevance.
4. Check the next core update. If some losses reversed around 16 April 2018, the signals were still shifting.
5. Rule out other causes. Site migrations, tracking changes, and robots or noindex errors near those dates can masquerade as a core update.

How to recover from the March 2018 core update

Google offers no specific fix for core updates, so recovery means improving the pages that lost ground against Google’s own quality questions. I approach it as a page-by-page review, starting with the pages that lost the most valuable traffic.

Question to ask about the page	What to do if the answer is no
Does it provide original information, research or analysis?	Add first-hand detail, examples or data you actually own.
Does it answer the query better than what now ranks above it?	Rework the page around the real intent shown by the current results.
Is it clear who wrote it and why they are credible?	Add author information and evidence of expertise.
Is it well presented and free of errors?	Fix structure, readability and factual accuracy.
Does it overlap with other pages on your site?	Consolidate overlapping pages into one stronger URL.

Avoid the common reaction of rushing through technical tweaks. Google said core update drops are about overall content, not about a technical rule being broken. Technical health still matters, but it is rarely the reason for a core update loss. If you need help reworking pages, my on-page optimisation services cover exactly this kind of content and intent review.

Expect recovery, when it comes, to show up at a later core update after Google has recognised the improvements. Small, steady gains can happen in between, but large reversals tend to line up with core update dates.

Is it still relevant today?

Yes. Broad core updates have continued several times a year since 2018, and the March 2018 announcement set the template: a confirmation, no specific target, and the same advice to focus on content quality. Knowing this history helps you read current core updates calmly instead of hunting for a single cause.

Frequently asked questions

When was the March 2018 core update?

It rolled out in the week before 12 March 2018, when Google confirmed it. Wikipedia dates it 8 March and Ignite Visibility 9 March.

What did the March 2018 core update target?

Nothing specific. Google said it benefits pages that were previously under-rewarded, which can push other pages down.

Why is it called Brackets?

Glenn Gabe gave it that nickname. It is not a Google name.

Was this the first Google core update?

Google had made broad changes before, but Sistrix describes March 2018 as the first update officially called a "core update".

Sources

• Search Engine Land: Google confirms core search ranking update
• Sistrix: Google updates and algorithm changes
• Wikipedia: Timeline of Google Search
• Ignite Visibility: Google update history

If your traffic fell around a core update and you want to know which pages to fix first, request a free audit. My SEO audit separates content and intent issues from technical problems so you do not waste time on the wrong fix.