What Actually Happens to Your Rankings During a Website Migration

The most common question we get is some version of "will I lose my rankings?" The honest answer is that something will happen, and the useful skill is telling the difference between the normal turbulence of a well-executed move and the early signs of a badly executed one.

What Google is actually doing#

When you migrate, Google does not receive a notification. It discovers the change the same way it discovers everything: by crawling.

It re-requests a URL it already knows. It gets a 301 pointing somewhere new. It queues the new URL for crawling, fetches it, evaluates it, and gradually transfers the accumulated signals from the old address to the new one.

That process is not instant, and it is not uniform. Google crawls your highest-value pages far more often than your forgotten ones. Your homepage might be reprocessed within days; a service page from 2021 could wait weeks.

This unevenness is why migrations look alarming in the middle. Half your site has been reprocessed and half has not.

The rough timeline#

These are patterns, not promises, crawl rates vary enormously with site size and authority.

Days 1–3. Little visible change. Google is still serving cached results. Impressions may look normal because rankings have not been re-evaluated yet.

Week 1–2. The dip, if there is one. Crawlers are working through your URL list. Some pages have transferred, others are in limbo. Rankings become inconsistent, a keyword sits at position 4 one day and 11 the next. This is the phase that panics people.

Week 3–4. Recovery becomes visible. The pages Google crawls most often have settled. Positions start clustering back near where they were.

Week 5–8. Long-tail pages catch up. Full stabilisation on a well-executed migration usually lands somewhere in here.

Larger sites take longer. A 2,000-page site can still be settling at week twelve.

Normal fluctuation vs. real damage#

Reading what you are seeing:

Signs of normal settling:

• Rankings wobble but stay within a few positions of where they were.
• Impressions dip modestly while clicks hold roughly steady.
• Search Console shows the new URLs being indexed at a healthy rate.
• The trend across weeks is flat or improving.

Signs of real damage:

• "Not found (404)" errors climbing in the Page Indexing report.
• Specific high-value pages vanishing from results entirely rather than moving down.
• A decline that deepens rather than levels off after week four.
• The new URLs are not being indexed at all.

The distinction is mostly about direction over time. Turbulence that trends flat is settling. Decline that keeps deepening is a problem you need to find.

The three failures that cause actual loss#

Nearly every damaged migration we have been asked to repair involved at least one of these.

1. Missing redirects. A URL was overlooked, now returns 404, and its accumulated value is being discarded. This is the single most common cause and the most preventable.

2. Redirecting everything to the homepage. Someone knew redirects mattered but pointed every old URL at /. Google treats an irrelevant redirect as a soft 404 and passes nothing.

3. Blocking the new site from being crawled. A staging site carries noindex or a Disallow: / in robots.txt, and it goes live with the site. Traffic does not dip, it collapses. Always check the live robots.txt and the page source for noindex within an hour of launch.

What to monitor, in order#

If you check only three things:

1. Page Indexing report in Search Console. Watch the 404 count. Any sustained rise means unmapped URLs.
2. A re-crawl of your old URL list. Every old address should return 301 → 200. Run this the day of launch and again a week later.
3. Your top 20 pages by traffic. Track them individually rather than watching site-wide totals, which average away the pages that matter.

When to worry#

Give it four weeks before drawing conclusions, unless you see a hard failure, a noindex in production, a spike in 404s, or a page disappearing from the index entirely. Those are not settling; fix them the day you spot them.

If you are past week eight and traffic is still meaningfully below where it started, the cause is structural. It is nearly always recoverable, a missed redirect found in week ten still works when you add it, but recovery takes as long as the original transfer did.

The uncomfortable truth#

A migration executed properly is boring. Rankings wobble for a fortnight and return to roughly where they started. There is no boost, you preserved what you had, which was the goal.

If someone promises a ranking improvement from the migration itself, be skeptical. A faster, better-structured site helps over time. But the migration's job is to not lose anything, and doing that reliably is harder than it sounds.