Why do new sites experience roller coasters in the SERPs?

What actually happens when launching a new site?

When a site first appears in Google's index, the algorithm has no performance history. It must therefore test the site under real conditions to calibrate its level of trust and thematic relevance.

This test translates into two main scenarios: an initial optimistic positioning where Google temporarily places the site higher to observe user behavior, or a pessimistic start where the site remains behind before being gradually moved up if the signals are good. Both trajectories are normal and depend on hard-to-predict factors.

How long does this learning phase last?

Google does not communicate an official duration. Field observations show that maximum volatility generally extends over 2 to 6 months, with peaks of adjustment during Core Updates if the site falls within an update window.

During this period, positions may fluctuate by 30 to 50 places from week to week for certain keywords. This is not a bug — it’s Google constantly recalculating the trust given to the domain based on collected signals: CTR, session time, bounce rate, acquired backlinks, consistency of published content.

Why doesn't Google stabilize the ranking directly?

Because stabilizing without real data would be a guess. Google prefers to observe how users interact with the site before fixing a position.

If the algorithm only detected on-page signals (content, structure, linking), it would be easy to manipulate the initial ranking with over-SEO. By imposing a real testing phase, Google forces the site to prove its relevance through usage, not just technical optimization.

• Initial fluctuations are not penalties — it’s a normal calibration phase.
• Two possible scenarios: optimistic followed by downward adjustment, or pessimistic followed by gradual increase.
• Observed duration: between 2 and 6 months of strong volatility, with gradual stabilization.
• Key signals monitored: user behavior, backlinks, editorial consistency, thematic authority.
• No need to overreact: suddenly changing the SEO strategy during this phase can confuse the signals sent to Google.

Is this statement consistent with field observations?

Yes, and it confirms what many practitioners have been observing for years. New sites indeed experience brutal variations without obvious technical reasons. What Mueller refers to as the "learning phase" corresponds to what some previously called the "Google Sandbox" — a term never officially validated but which described the same phenomenon.

Where it gets interesting is that Google explicitly admits to two opposing trajectories. This means that there is no universal rule: a site can start strong and then drop, while another can remain invisible and then explode. The problem is that we still don’t know what triggers one scenario or the other. [To be confirmed]

What signals determine the initial trajectory?

Mueller doesn’t say — and that's where it gets tricky. We can make hypotheses: domain authority before publication (expired domain purchased vs new domain), early backlinks from established sources, thematic consistency from the outset, volume of content at launch.

But honestly, we lack concrete data. Some clean, well-structured sites with expert content start at the bottom of page 5. Others, technically average but supported by a few strong backlinks, land on page 1 in the first week. The pattern is unclear, and Google provides no objective criteria to predict the trajectory.

Should I change my SEO strategy during this phase?

It’s tempting, but often counterproductive. If your site drops after a good start, the instinct is to correct something — add backlinks, rewrite content, change structure. Except that Google may just be adjusting, not sanctioning.

The safest recommendation: stick to the initial course for at least 3 to 4 months. Continue to publish regularly, acquire clean backlinks, optimize the user experience — but avoid drastic strategy shifts. If after 6 months the positions remain disastrous despite clean signals, then yes, it’s time to investigate deeper.

What should you do when launching a new site?

First rule: anticipate fluctuations and inform the client if you are working in an agency. There’s nothing worse than a client panicking after 3 weeks because the site has lost 20 positions — if they know it’s normal, they won’t pressure you into making hasty decisions.

On the technical side, focus on editorial consistency: publishing 5 in-depth articles per week is better than 20 lightweight contents. Google seeks to identify your theme — help it by staying focused. Avoid launching blog, e-commerce, directory sections simultaneously: choose one main vertical for the first 3 months.

What mistakes should you absolutely avoid during this phase?

The most common mistake: over-optimizing in reaction to fluctuations. Your site loses 15 places overnight, you stuff keywords into titles, you buy 50 cheap backlinks, you overhaul the structure — and you send conflicting signals to Google that no longer knows how to rank you.

Second pitfall: comparing performance with established sites. Your competitor is ranked 3 with content objectively worse than yours? Normal — they have 4 years of history and built authority. You can’t catch up in 6 weeks, even with the best SEO in the world.

How to monitor the learning phase without panicking?

Set up a weekly tracking of positions on your top 20 keywords, but analyze on a monthly trend — not daily. Look at the curves over at least 4 weeks before drawing a conclusion.

Also monitor behavioral metrics in GA4: session time, pages per session, adjusted bounce rate. If these KPIs remain good despite position fluctuations, it means your content is working — Google will eventually recognize it. If positions rise but the bounce rate explodes, you have a real relevance issue.

• Inform the client or management that the first 3 to 6 months will be volatile — this is not an SEO failure.
• Maintain a regular publishing rhythm without abruptly changing the editorial line.
• Track positions on a monthly trend, not in daily reactions.
• Avoid massive acquisitions of cheap backlinks to "speed up" trust — this can have the opposite effect.
• Monitor Search Console to detect a real manual penalty (explicit notification).
• Do not overhaul the technical structure every 2 weeks — give Google time to index and evaluate.