Does website downtime affect SEO?

It can, but it depends on how long the site is down. A brief outage of a few minutes has effectively no impact, because Googlebot simply retries later. Sustained downtime over hours or days reduces how often Google crawls the site and can temporarily push pages out of the index.

How long can a site be down before it hurts rankings?

There is no exact cutoff, but the pattern is clear. Minutes are harmless and a few hours are usually recoverable, especially with a correct 503 response. Once an outage runs for a day or more with 5xx errors, crawling drops and pages can be deindexed temporarily until the site is stable again.

Does a 503 error hurt SEO?

A short 503 Service Unavailable is the correct way to handle downtime and does not hurt SEO on its own. Google reads it as a temporary problem and keeps the page indexed while it waits, especially if a Retry-After header is set. The harm comes when 503 or other 5xx errors continue for a long time.

Does Deltio alert me when a client site goes down?

Yes. Deltio checks each site with an HTTP request every 10 minutes and sends an email and Slack alert the moment a site goes offline or is firewall blocked. It also alerts you when the site comes back online, so you know the incident is over without checking by hand.

Can Deltio analyse my crawl budget or server logs?

No. Deltio detects whether a site is up or down and alerts you quickly, but it does not analyse crawl budget or read server log files. Its value here is speed: catching an outage within 10 minutes so you can act before failed crawls accumulate.

How much does Deltio cost?

Deltio starts at £24 a month on the Starter plan, or £20 a month billed annually. Professional is £49 a month and Enterprise is £119 a month, with CSV export on the Professional and Enterprise plans. Every plan includes a 14-day free trial.

← Back to the blog

Does Downtime Hurt SEO? What Really Happens to Rankings

Yes, prolonged downtime can hurt SEO, but a short blip usually will not. A few minutes of downtime handled with a correct 503 status is a non-event for rankings: Googlebot retries later. Hours or days of 5xx errors and timeouts are different: Google crawls the site less, and if the outage drags on, pages can drop out of the index temporarily. For an agency the real risk is finding out too late. Deltio checks every client site every 10 minutes and alerts you by email and Slack the moment one goes down, from £20 a month with a 14-day free trial.

If you run SEO for a handful of clients, downtime is not yours to fix. But it is yours to notice: a site Google cannot reach is a site that cannot rank. Here is what actually happens to rankings when a site goes down, and how to catch it before the damage sets in.

What Googlebot does when a site is down

Googlebot is patient. It does not deindex a page the first time it fails to load.

It retries: on a timeout, refused connection or 5xx status, Googlebot backs off and comes back later.
A correct 503 reads as temporary: with 503 Service Unavailable, Google keeps the page indexed while it waits.
A wrong response is the danger: a 500, a hard timeout, or a 200 serving an error page look like real faults, not maintenance.
Prolonged failure cuts crawling: if errors continue for days, Google crawls the site less often.

One failed crawl means nothing. A pattern of failed crawls over days is what erodes your position.

A five-minute blip versus a two-day outage

Duration decides whether this is a footnote or a real problem.

Minutes: a quick deploy or restart. Googlebot may not even hit the site, and if it does, it retries. No ranking impact.
A few hours: usually recoverable, especially with a clean 503. Rankings bounce back once the site is stable.
Days: sustained 5xx errors tell Google the pages are unreliable. Crawling drops and pages can be temporarily deindexed, usually returning after recovery but not always in the same position.

Repeated short outages are their own problem: a site that flickers constantly looks unstable.

A `503` with `Retry-After` is the right way to do maintenance

If a site has to go offline on purpose, return a 503 Service Unavailable with a Retry-After header telling Googlebot when to come back. The wrong way is a normal 200 page saying "we're doing maintenance", or letting the server throw a 500. Both send the wrong signal. A planned outage handled with 503 and Retry-After is close to invisible to search. Most agencies do not control this header, so check with the developer or host before a migration. For another thing that quietly breaks sites during infrastructure changes, see SSL certificate expiry monitoring.

The real problem for an agency: finding out in time

Rankings are only half of it. A down site converts nothing: visitors bounce off the error page, forms never submit, sales do not happen. For a client, the lost weekend revenue often stings more than a ranking dip, and it lands on you to explain.

The scenario that costs money: a client site goes down at 11pm on Friday, nobody is watching, Googlebot keeps hitting errors all weekend, and you find out Monday, forty hours too late. Checking every client site by hand is not realistic across 5 to 50 of them. The only workable answer is automated monitoring that shouts the moment one falls over. If you are weighing up tools, our UptimeRobot alternative comparison is a good place to start.

How Deltio does it

Deltio watches each client site with an HTTP check every 10 minutes, so a down site is caught fast, not on Monday.

Detects the state: online, offline or firewall blocked, with response time and status code so you can tell a clean 503 from a hard 5xx.
Alerts you immediately: email and Slack the moment a site goes down, in your language and timezone.
Tells you when it recovers: a second alert when the site is back online.
Shares a public status page: a link you can send a client, no login needed.

One honest limit: Deltio detects whether a site is up or down and alerts you. It does not analyse Googlebot's crawl budget or read your server logs. What it gives you is speed. Catch the outage within 10 minutes and the failed crawls never pile up. To see how uptime and indexability fit together, see uptime and SEO monitoring.

Getting started

Add your first client site and Deltio starts checking it every 10 minutes straight away. Point the alerts at your email and team Slack, share the status page with the client, and you will know about the next outage while it is still happening. The trial runs for 14 days.

Frequently asked questions

Does website downtime affect SEO?: It can, but it depends on how long the site is down. A brief outage of a few minutes has effectively no impact, because Googlebot simply retries later. Sustained downtime over hours or days reduces how often Google crawls the site and can temporarily push pages out of the index.
How long can a site be down before it hurts rankings?: There is no exact cutoff, but the pattern is clear. Minutes are harmless and a few hours are usually recoverable, especially with a correct 503 response. Once an outage runs for a day or more with 5xx errors, crawling drops and pages can be deindexed temporarily until the site is stable again.
Does a 503 error hurt SEO?: A short 503 Service Unavailable is the correct way to handle downtime and does not hurt SEO on its own. Google reads it as a temporary problem and keeps the page indexed while it waits, especially if a Retry-After header is set. The harm comes when 503 or other 5xx errors continue for a long time.
Does Deltio alert me when a client site goes down?: Yes. Deltio checks each site with an HTTP request every 10 minutes and sends an email and Slack alert the moment a site goes offline or is firewall blocked. It also alerts you when the site comes back online, so you know the incident is over without checking by hand.
Can Deltio analyse my crawl budget or server logs?: No. Deltio detects whether a site is up or down and alerts you quickly, but it does not analyse crawl budget or read server log files. Its value here is speed: catching an outage within 10 minutes so you can act before failed crawls accumulate.
How much does Deltio cost?: Deltio starts at £24 a month on the Starter plan, or £20 a month billed annually. Professional is £49 a month and Enterprise is £119 a month, with CSV export on the Professional and Enterprise plans. Every plan includes a 14-day free trial.