2021 was the year Google started updating Search in clusters. Instead of one or two big moments, site owners faced back-to-back core updates in June and July, the long-awaited page experience rollout, a run of spam and link spam updates, two product reviews updates and a local search shake-up before Christmas. Many SEOs remember it as exhausting.
Looking back from 2026, 2021 is worth studying because it set patterns that still hold: core updates announced with rollout windows, separate systems for reviews and spam, and Google's push for clearer labelling of paid links. It was also the year the Google Search Status Dashboard's ranking history begins, with the November 2021 spam update as its earliest entry.
This review lists every confirmed 2021 update in date order, with links to our individual explainers, then pulls out the lessons that still matter.
Key Takeaways
- Google confirmed three core updates in 2021: June, July and November.
- The page experience update rolled out on mobile from 15 June to about 2 September 2021, adding Core Web Vitals to existing signals.
- Spam work was heavy: two spam updates in June, a link spam update from July to August, and a spam update in November.
- Product reviews updates arrived in April and December, signalling Google's focus on in-depth, first-hand reviews.
- A local search update in late November and early December (nicknamed "Vicinity" by the industry) rebalanced local ranking factors.
Every confirmed 2021 update, in date order
| Dates (2021) | Update | Type |
|---|---|---|
| February | Passage ranking goes live in US English | Ranking system |
| 8–22 Apr | April 2021 product reviews update | Reviews |
| 18 May | MUM announced at Google I/O | AI model (not general ranking) |
| 2–12 Jun | June 2021 core update | Core |
| 15 Jun – ~2 Sep | Page experience update (mobile) | Page experience |
| 23 Jun and 28 Jun | June 2021 spam updates (two, each within a day) | Spam |
| 1–12 Jul | July 2021 core update | Core |
| 26 Jul – 24 Aug | July 2021 link spam update | Link spam |
| 3–11 Nov | November 2021 spam update | Spam |
| 17–30 Nov | November 2021 core update | Core |
| 30 Nov – 8 Dec | November 2021 local search update ("Vicinity") | Local |
| 1 – ~21 Dec | December 2021 product reviews update | Reviews |
Dates come from Search Engine Land's 2021 review and, for November and December, the Search Status Dashboard. Search Engine Land also mentions smaller 2021 changes such as an image search update and changes to how titles were shown; we have left those out of the table because their dates and scope are less clearly documented.
“Google had a busy year of search algorithm updates in 2021”
— Barry Schwartz, Search Engine Land, Google algorithm updates 2021 in review
The year in four themes
1. Core updates came in a pair
The June 2021 core update was released with Google saying some changes were not ready, and the July update followed as the planned second part. That made before-and-after analysis harder, because a site could move in June and move again in July. November's core update landed just ahead of the holiday shopping season, which made it especially stressful for ecommerce sites.
2. Page experience became a ranking signal
The page experience update added Core Web Vitals to existing signals such as mobile-friendliness, HTTPS and the absence of intrusive interstitials. Google said the impact would be small, and that is how it played out for most sites. One detail has since changed: First Input Delay was replaced by Interaction to Next Paint in March 2024. Our Core Web Vitals guide covers the current metrics.
3. Spam and links got serious attention
Google ran two quick spam updates in June, then a link spam update that ran for about a month. With it, Google reminded sites to qualify affiliate, sponsored and guest-post links with the right rel attributes. If you have never audited that, our posts on sponsored links and the affiliate and sponsored links audit are a good start.
4. Reviews and local search got their own updates
The April and December product reviews updates rewarded in-depth reviews with original research over thin summaries. The December update was the second of its kind and trackers saw a bigger impact than in April. The local update rebalanced local ranking factors; Wikipedia's timeline describes it as giving smaller businesses closer to the searcher more chance to appear. See local ranking drops after an update.
2021 updates by type
| Type | Count in 2021 | What site owners should have checked |
|---|---|---|
| Core | 3 | Overall content quality and usefulness across the site |
| Spam (including link spam) | 4 announcements (two in June, July link spam, November) | Paid links, scaled thin pages, hacked content |
| Reviews | 2 | Depth, evidence and first-hand testing in review content |
| Page experience | 1 (mobile) | Core Web Vitals, HTTPS, interstitials |
| Local | 1 | Business Profile accuracy, relevance and proximity |
Lessons from 2021 that still apply
- Wait for the full rollout before judging. June and July 2021 showed that one update can be split into two.
- Keep updates separate in your analysis. Late 2021 saw the November core update, the local update and the December product reviews update overlap within a few weeks.
- Label commercial links. The link spam update made rel="sponsored" and rel="nofollow" a practical concern, not a theory.
- Prove first-hand expertise in reviews. This thread runs straight to the 2023 reviews system and the reviews system today.
- Treat page experience as hygiene. Fast, stable pages help users; they rarely rescue weak content on their own.
Common mistakes people made in 2021
- Panicking after the June core update instead of waiting for July's planned follow-up.
- Expecting large ranking gains from Core Web Vitals work alone.
- Blaming the November core update for local pack changes caused by the separate local update.
- Leaving affiliate and sponsored links unqualified after Google's reminder.
- Assuming MUM changed general ranking; Google's ranking systems guide says it is not used for general ranking.
What came next
2022 brought the first helpful content update and more reviews updates; read our 2022 year in review. For the long view, see our Google algorithm updates hub and core updates guide.
Related Guides
- Google Algorithm Updates in 2022: A Year in Review
- Google Algorithm Updates in 2023: A Year in Review
- Google Algorithm Updates in 2024: A Year in Review
Frequently Asked Questions
How many core updates did Google release in 2021?
Three: June (2–12 June), July (1–12 July) and November (17–30 November).
What was the biggest 2021 update?
Google does not rank its updates by impact, and effects varied by site. Trackers saw a bigger impact from the December product reviews update than from April's, while Google said the page experience update would have a small impact.
What was the Vicinity update?
An industry nickname for a local search update Google confirmed after it rolled out between 30 November and 8 December 2021.
Is the 2021 page experience update still relevant?
Page experience is still part of Google's systems, but the metrics changed: Interaction to Next Paint replaced First Input Delay in March 2024.
Where can I see official dates for 2021 updates?
The Search Status Dashboard history begins with the November 2021 spam update. Earlier 2021 dates come from Google announcements reported by sources such as Search Engine Land.
Conclusion
2021 taught SEOs to expect frequent, overlapping updates and to separate core, spam, reviews and local changes when diagnosing traffic shifts. Those lessons still pay off. If you want help reviewing your site's history against these updates, our SEO services team can help. Get a free quote.
