Another month, another core update. But this one feels different, and I think the data backs that up. Google confirmed the March 2026 core update on March 13th, with a full rollout expected through March 27th. What makes this one unusual is that it launched alongside the first-ever dedicated Discover core update. Two simultaneous algorithm shifts targeting different surfaces of search. That's new territory.
I've been tracking ranking volatility across a range of client sites and industry verticals since January, and honestly, things have been unstable for about two months straight. There hasn't been a reliable baseline since early January. So when this update started rolling out, it was hard to separate what was "new" from what was already in motion. But the patterns are becoming clearer now, and I want to walk through what I'm seeing.
What Google actually said (and what they didn't)
The official line is familiar. Google says the March 2026 core update is designed to surface helpful, reliable content and reduce the visibility of content that doesn't serve users well. Standard stuff. They've been saying variations of that since the Helpful Content Update era.
What's more interesting is what they said about the Discover update. Google explicitly called out original reporting, unique insights, and strong E-E-A-T signals like author bylines as ranking factors for Discover visibility. That's not vague guidance. That's them telling you exactly what they want to see. If you've been publishing faceless, generic blog posts without clear authorship, Discover is going to be a problem for you. I wrote about this in the E-E-A-T implementation guide months ago, and the March update is proving that guidance right.
The unspoken target here is AI spam content. Google hasn't said those exact words in their announcement, but every signal points in that direction. Thin, low-value, mass-produced content is getting crushed. Not all AI content, mind you. There's an important distinction between AI-assisted content written by someone with genuine expertise and AI-generated filler published at scale with no human oversight. Google seems to be getting better at telling the difference.
Who's winning so far
It's early, and the update is still rolling out as I write this. But the trends I'm seeing across my own tracking and the broader industry chatter are pretty consistent.
Sites with demonstrable expertise
If your content is written by people who actually know what they're talking about, and that expertise is visible on the page through author bios, credentials, first-person experience, and original data, you're likely seeing gains. I've watched several niche sites climb steadily over the past week. The common thread is that these sites aren't trying to rank for everything. They're focused on topics where they have genuine authority.
This is something I keep coming back to when talking about the 80/20 rule in SEO. The sites that focus deeply on their core topics instead of spreading thin across hundreds of tangential keywords are the ones that tend to weather updates well.
Original reporting and unique data
Sites producing original research, case studies, or reporting that can't be found elsewhere are getting rewarded. This is especially true on the Discover side. If you've got content that adds something new to a conversation rather than just summarising what everyone else has already said, Google is noticing. Search Engine Land has been covering this shift for a while now, and the March update looks like the logical next step.
Well-structured, technically sound sites
This one doesn't get enough attention. I've seen sites with great content still struggle because their technical SEO foundation is weak. Slow pages, broken internal links, crawl issues, poor mobile experience. The March update seems to be amplifying existing signals, which means technical problems that were costing you 10% of your potential visibility might now be costing you 20% or more. If you haven't run a technical SEO audit recently, now would be a good time.
Who's getting hit
The losses I'm seeing are more dramatic than the gains. That's typical of core updates. Winners gain gradually, losers drop fast.
AI content farms
This is the big one. Sites that scaled content production using AI without meaningful human editorial oversight are seeing significant drops. I'm talking about the operations publishing 50 to 100 posts per week of formulaic, template-driven content that reads like it was generated by a prompt and published with minimal review.
Here's what I actually think is happening. Google isn't detecting AI content per se. They're detecting the patterns that come with mass-produced content, regardless of whether a human or machine wrote it. Repetitive structure. Lack of original examples. No first-hand experience. Generic advice that could apply to any industry. Those are the markers, and AI just happens to produce them at scale very efficiently.
If your SEO blog writing strategy has been "generate as much as possible and see what sticks," this update is a wake-up call.
Thin affiliate and comparison sites
Sites that exist primarily to funnel clicks to affiliate offers, with thin review content that doesn't demonstrate actual product experience, are getting hammered again. This has been a trend across multiple updates, but March 2026 seems to be tightening the screws further. If your product reviews don't include original photos, specific use-case details, or genuine pros and cons from hands-on testing, you're increasingly invisible.
Sites with declining engagement metrics
This is the part nobody talks about. I'm seeing a correlation between sites that have had declining user engagement over the past six months and sites that are losing visibility in this update. Shorter time on page, higher bounce rates, fewer pages per session. Whether Google uses those signals directly or whether they're just a proxy for content quality, the outcome is the same. If users aren't finding value in your content, Google eventually stops sending them there.
The Discover update deserves its own conversation
I want to spend some time on the Discover component because it's genuinely new. Google has never released a dedicated core update specifically for Discover before. They've always bundled Discover changes into broader core updates or made quieter adjustments behind the scenes.
The fact that they're now treating Discover as its own ranking system worthy of a named update tells you how important that traffic source has become. For some publishers, Discover drives more traffic than traditional search. And the rules for Discover are different.
From what I'm seeing, the Discover update is heavily weighted toward:
- Author identity. Clear bylines with linked author pages. Anonymous content is getting less Discover exposure.
- Freshness and timeliness. Evergreen content still appears, but Discover is favouring content that responds to current events or emerging topics.
- Visual quality. High-quality featured images that meet Discover's size requirements (1200px wide minimum) are more important than ever.
- Topical authority. Sites that consistently publish on a topic are getting more Discover placements than sites that cover a topic once and move on.
If Discover is a meaningful traffic channel for you, or if you want it to be, these signals matter. And they overlap significantly with the LLM visibility factors I've been tracking. The same qualities that make content visible in AI-powered search tend to make it visible in Discover.
Two months without a baseline is a problem
Here's something that's making this update harder to analyse than usual. Ranking volatility has been elevated since early January 2026. That's roughly two months of instability before the March core update even started rolling out. Search Engine Roundtable has been documenting this ongoing turbulence in detail.
Without a stable baseline, it's difficult to isolate what's caused by the March update specifically and what's carry-over from whatever Google was testing in January and February. I've seen sites where rankings dropped in late January, partially recovered in February, and then dropped again when the March update hit. Is that one continuous adjustment or two separate ones? Hard to say.
My advice is to look at the overall trajectory rather than trying to pin specific changes to specific dates. If your visibility has been declining since January, this update is probably an acceleration of whatever was already happening, not a new problem. If you were stable through January and February but dropped when the March update hit, that's a different story and likely means something specific in this update is affecting you.
What to do if you got hit
I'm not going to pretend there's a quick fix. There never is with core updates. But here's the framework I'm working through with clients who are seeing losses.
Audit your content quality honestly
Pull up your top 50 pages by traffic (pre-update traffic, obviously). Read them. Not skim them. Actually read them. Ask yourself: does this content contain anything that someone couldn't get from a quick AI search? Does it include original examples, data, or perspectives? If the answer is no, that's your problem. You need to add genuine value that goes beyond summarising common knowledge.
Check your author signals
Do your pages have clear author bylines? Do those authors have bio pages with credentials? Are the same authors consistently writing about the same topics? If you've been publishing under a generic brand name with no individual attribution, the Discover update in particular is going to be unkind to you. Our E-E-A-T implementation guide covers exactly how to set this up properly.
Review your technical foundation
Core updates amplify existing signals. If your site has technical issues, they become more costly during and after an update. Check your Core Web Vitals, crawl errors, internal linking structure, and mobile experience. I've written about earlier core update crawlability fixes that are still relevant here. A lot of recovery work starts with fixing the technical basics that have been neglected.
Look at who's now outranking you
This is critical. If competitors are overtaking you, study what they're doing differently. Not to copy them, but to understand what signals Google is now preferring. Are their pages more detailed? Better structured? More focused on a specific search intent? The answers are usually sitting right there in the SERPs if you're willing to look objectively.
Don't panic-publish
The worst thing you can do after a core update is rush out a bunch of new content or make dramatic changes to pages that are still ranking. I've seen sites make things worse by rewriting pages that were performing fine, or by publishing dozens of low-quality posts in an attempt to "recover." That's not how this works. Stick to your monthly SEO checklist, focus on quality over quantity, and give the update time to finish rolling out before making big decisions.
The bigger picture
If I zoom out and look at the trajectory from the Helpful Content Update through to March 2026, the direction is clear. Google is systematically devaluing content that exists primarily to rank in search. They want content that exists because someone had something worth saying, and search visibility is a byproduct of that value, not the goal.
That's a philosophical shift, and it has practical consequences. The old model of doing keyword research, finding gaps, and producing content to fill those gaps is becoming less effective on its own. You still need to understand what people are searching for. But the content you produce needs to come from a place of genuine expertise and offer something the searcher can't easily get elsewhere.
This connects to the broader shift toward AI SEO and how search is evolving. As AI overviews and LLM-powered search become more prevalent, the bar for what earns a click keeps rising. Your content needs to be the thing that AI systems cite as a source, not the thing they can easily replace. If you're thinking about scaling SEO, the only sustainable path forward is scaling quality, not volume.
For a comprehensive look at how Google's algorithm changes have evolved to this point, Search Engine Journal's algorithm history is a solid reference to understand the trajectory.
What I'm watching next
The update is expected to finish rolling out by March 27th. I'm going to hold off on drawing firm conclusions until at least a week after that. Early data is noisy, and I've seen plenty of cases where sites that dropped during a rollout recovered partially once it completed.
What I'm paying closest attention to is whether the Discover update and the core update stabilise at the same time or whether one finishes before the other. If they're truly independent systems, they might settle at different rates, which would make analysis even more complicated.
I'm also watching how this interacts with the algorithm update recovery fixes that worked in previous cycles. Some of those strategies may need adjusting based on what this update is actually prioritising.
If your site has been affected, focus on the fundamentals. Genuine expertise, clear authorship, technical quality, and content that serves real user needs. That's been the right strategy for years, and this update just raises the stakes for getting it right.