Official statement
Other statements from this video 21 ▾
- 1:22 Pourquoi Google retarde-t-il la migration mobile-first de certains sites ?
- 3:10 Le mobile-first indexing améliore-t-il vraiment votre positionnement dans Google ?
- 5:13 Faut-il vraiment traiter tous les problèmes Search Console en urgence ?
- 7:07 Faut-il vraiment optimiser les ancres de liens internes ou est-ce du temps perdu ?
- 8:42 Faut-il vraiment éviter d'avoir plusieurs pages sur le même mot-clé ?
- 9:58 Peut-on prouver la qualité éditoriale d'un contenu à Google avec des balises structured data ?
- 11:33 Faut-il vraiment respecter les types de pages supportés pour le schema reviewed-by ?
- 14:02 Le cloaking technique est-il vraiment toléré par Google ?
- 19:36 Comment Google groupe-t-il vos URL pour prioriser son crawl ?
- 22:04 Pourquoi votre trafic chute-t-il vraiment après une pause de publication ?
- 24:16 Pourquoi Google Discover est-il plus exigeant que la recherche classique pour afficher vos contenus ?
- 26:31 Le structured data non supporté influence-t-il vraiment le ranking ?
- 28:37 Les erreurs techniques d'un domaine principal pénalisent-elles vraiment ses sous-domaines ?
- 30:44 Pourquoi vos review snippets disparaissent-ils puis réapparaissent chaque semaine ?
- 32:16 Le Domain Authority est-il vraiment inutile pour votre stratégie SEO ?
- 32:16 Les backlinks déposés manuellement dans les forums et commentaires sont-ils vraiment inutiles pour le SEO ?
- 34:55 Pourquoi vos commentaires Disqus ne s'indexent-ils pas tous de la même manière ?
- 44:52 Pourquoi Google confond-il vos pages locales avec des doublons à cause des patterns d'URL ?
- 48:00 Pourquoi les redirections 404 vers la homepage détruisent-elles le crawl budget ?
- 50:51 Pourquoi votre no-index massif met-il 6 mois à 1 an pour être traité par Google ?
- 55:39 Les URL plates nuisent-elles vraiment à la compréhension de Google ?
Google offers unavailable_after to signal when an event page becomes outdated, allowing the engine to save its crawl budget on expired content. Specifically, this tag helps prioritize the indexing of new events rather than wasting crawl budget on pages with no residual value. However, be aware: this directive is not an immediate deindexing instruction, just a priority signal.
What you need to understand
What is the unavailable_after tag and how does it work?
The meta unavailable_after tag allows you to specify an explicit expiration date for a web page. It is placed in the <head> and accepts a precise date format (RFC 850). When this date is reached, Google considers the content to be no longer relevant and drastically reduces the crawl frequency for this URL.
Unlike a noindex directive, this tag does not immediately remove the page from the index. It simply signals to Google that the content becomes outdated on a given date, which influences crawl prioritization. The bot can still temporarily index the page, but it will gradually reduce its visits after expiration.
Why does Google recommend this approach for event sites?
Event sites generate a continuous flow of new pages while old ones lose all value once the date has passed. Without an explicit signal, Googlebot continues to crawl these outdated pages, wasting crawl budget that could be used to discover new events.
By using unavailable_after, you direct crawl resources toward what really matters — your upcoming events. This is particularly crucial for large sites with thousands of monthly events, where crawl budget becomes a limiting factor for fast indexing.
Does this tag replace other methods for managing outdated content?
No, and this is a crucial point. The unavailable_after tag complements other strategies but does not replace them. You can still choose to redirect past events to an archive page, add a noindex after expiration, or even completely remove the pages.
Each approach addresses a different need. If you want to keep pages for historical reference and brand SEO, unavailable_after is ideal. If the content has absolutely no residual value, complete removal remains a more drastic but effective solution.
- unavailable_after signals an explicit expiration date, not an immediate removal
- The tag influences the crawl budget, not directly the ranking of active pages
- It can be combined with other strategies (redirects, noindex, archives) based on your business goals
- The date format must comply with RFC 850 to be interpreted correctly by Google
- After expiration, Google may still keep the page indexed for a while before gradual deindexing
SEO Expert opinion
Is this recommendation consistent with what we observe in the field?
Yes, generally speaking. Field feedback shows that Google does indeed respect this directive and reduces the crawl of expired pages. On event or time-limited promotional sites, there is a notable drop in Googlebot hits on URLs tagged with unavailable_after, sometimes reducing by 80-90% after the specified date.
Where it sometimes gets tricky is with the timing. Google does not instantly deindex at the moment the date arrives. It can take a few days, or even weeks on some low-authority sites. If your priority is quick deindexing, adding a noindex after expiration remains more effective than unavailable_after alone.
What nuances should be added to this statement from Mueller?
First point: Mueller talks about “not crawling these pages after expiration,” but that’s an oversimplification. Google reduces crawl, it does not stop it completely. Sporadic crawls are still observed, especially if the page receives external links or is in the sitemap.
Second nuance — and this is rarely mentioned: this tag only makes sense if your site regularly generates new content. On a small site with 10 events a year, the crawl budget gain is negligible. It’s an optimization for large volumes, not a universal best practice. [To be checked] based on the actual size of your event catalog.
In what cases can this tag pose problems?
If you have recurring events (e.g., “Annual Christmas Concert”), using unavailable_after on the URL of the past edition without redirecting to the new one can create confusion. Google will reduce the crawl of the old page, but if it accumulates historical backlinks, you lose link juice by not redirecting.
Another case: events that generate persistent content (photos, summaries, testimonials). Marking the page as outdated while it continues to attract organic traffic for informational queries is shooting yourself in the foot. Analyze your analytics before blindly applying this tag to all past events.
Practical impact and recommendations
How to implement unavailable_after effectively on an events site?
Add the tag in the <head> of each event page with a date corresponding to the day after the event (or a few days later if you want to allow time for latecomers to check it out). Format: <meta name="unavailable_after" content="31-Dec-2025 23:59:59 GMT">.
Automate the addition through your CMS or template generator. If you’re using WordPress with an events plugin, most recent solutions allow for dynamic injection of this tag based on the end date of the event. For custom developments, create a function that calculates the expiration date and generates the tag.
What common mistakes should be avoided during implementation?
A classic error is to use a non-compliant date format. Google expects RFC 850 (“31-Dec-2025 23:59:59 GMT”), not a standard ISO 8601. If you put “2025-12-31T23:59:59Z,” Google might ignore the tag without warning.
Another pitfall: marking a recurring event as outdated without managing redirection to the next edition. You’re signaling to Google that the page has no value, but if the event returns annually with a new URL, redirect the old one to the new to transfer authority and historical signals.
How to check if Google is properly considering the tag?
Check the server logs to observe the crawl frequency before and after the expiration date. You should see a clear drop in Googlebot requests on these URLs. If there’s no change after 2-3 weeks, verify the date format and ensure the tag is present in the rendered HTML (not just injected via JavaScript if Google is crawling in non-JS mode).
The Search Console does not directly report the status of this tag, but you can inspect the URL and check in the explored HTML code if Google has seen it. If it doesn’t appear, then your implementation has a rendering issue.
- Implement unavailable_after on all past event pages with the correct RFC 850 format
- Automate the addition of the tag through your CMS or templates to avoid omissions
- Monitor server logs to confirm crawl reduction post-expiration
- Combine with a redirection or noindex strategy if rapid deindexing is needed
- Do not apply to recurring events without managing redirections between editions
- Check the rendered HTML to ensure Google can see the tag
❓ Frequently Asked Questions
La balise unavailable_after supprime-t-elle immédiatement la page de l'index Google ?
Quel format de date faut-il utiliser pour unavailable_after ?
Peut-on utiliser unavailable_after sur d'autres types de contenu que les événements ?
Que se passe-t-il si on modifie ou retire la balise unavailable_after après l'avoir ajoutée ?
La balise unavailable_after affecte-t-elle le positionnement des pages avant la date d'expiration ?
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