Google evaluates redirects based on observed behavior over time rather than treating the status code as an absolute, permanent instruction, which means a 302 that’s actually left in place indefinitely will typically have its signals consolidated to the destination URL in a manner similar to a 301 eventually, but that consolidation tends to take longer, since a 302’s semantic meaning explicitly signals “temporary” and Google’s systems reasonably wait to see whether the redirect really is temporary before treating it the way they’d treat a permanent one. For a migration, where the intent genuinely is permanent, using a 301 removes that ambiguity from the start and gets consolidation moving with more confidence and speed than leaving Google to wait and observe a 302’s actual persistence before trusting it.
The mechanism: status code as a starting signal, refined by observed behavior
Google’s documentation on redirects describes 301 as the status code that explicitly declares a permanent move, prompting Google to treat the redirect as reliable evidence that the destination should inherit the original URL’s ranking signals. A 302 explicitly declares a temporary move, and Google’s stated handling has evolved and been clarified over time, including public comments from Mueller and others, that Google doesn’t treat 302 status codes as a promise to never consolidate signals, but does treat the “temporary” label as a legitimate reason to be more cautious, waiting to observe whether the redirect persists rather than immediately assuming the destination is meant to permanently replace the source.
This means the practical difference isn’t “302 never passes equity” (an outdated and inaccurate characterization) versus “301 passes equity” as a binary; it’s closer to a difference in speed and default caution. A 301 tells Google upfront “this move is permanent, please treat the destination as the successor,” and Google generally acts on that fairly directly. A 302 tells Google “this is temporary,” and Google’s systems reasonably hold off on making that same assumption immediately, since a portion of 302s genuinely are temporary (a page under maintenance, a seasonal redirect, an A/B test), and Google can’t distinguish a genuinely temporary 302 from a permanently-left-in-place 302 without observing it over time. Only once a 302 has persisted long enough to look more like a permanent fixture than a genuinely temporary condition does Google’s confidence in treating it similarly to a 301 grow.
When this distinction actually matters in practice
During a planned, permanent site migration: this is exactly the scenario where the distinction matters most, because the underlying intent (permanent move) doesn’t match what a 302 signals (temporary), and the wait for Google to build that confidence through observed persistence is time during which the migration’s ranking signal transfer is slower and less certain than it needs to be. There’s no documented, specific number of weeks Google has published for how much slower a 302-based consolidation is relative to a 301 in a migration context, so citing a precise figure here would be fabricating a specificity that doesn’t exist; the honest statement is that 301 is faster and more certain, without a verified exact delta.
During genuinely temporary situations: a maintenance-driven redirect, a short-term A/B test, a seasonal promotional page swap, this is where a 302 is the semantically correct and functionally appropriate choice, since the intent really is for the redirect to be temporary and for the original URL to resume normal service afterward. Using a 301 in a genuinely temporary situation risks Google treating the move as permanent and potentially deprioritizing or dropping the original URL’s standing even though the site intends to revert.
Why “just as good, no caveat” is the wrong framing
Some more dated SEO commentary asserts that 301 versus 302 makes no meaningful difference at all, based on Google’s evolved willingness to eventually treat a persistent 302 similarly to a 301. That framing skips the caveat that matters: “eventually” and “similarly” both carry real qualifications, eventual consolidation depends on the redirect actually persisting long enough for Google to build that confidence, and during a live migration, every bit of that waiting period is exposure the site doesn’t need to accept when a 301 would have communicated permanence immediately and unambiguously.
Practical implication
| Aspect | 301 (Permanent) | 302 (Temporary) |
|---|---|---|
| Semantic meaning | Move is permanent | Move is temporary |
| Google's default handling | Treats destination as the successor fairly directly | Waits to observe persistence before treating similarly to a 301 |
| Signal consolidation speed | Faster, more certain | Slower, contingent on Google observing the redirect persists |
| Recommended use | Permanent migrations, URL structure changes, domain moves | Genuinely temporary conditions: maintenance, A/B tests, short-term swaps |
For any move genuinely intended to be permanent, including full site migrations, use 301s throughout, since that removes the ambiguity and avoids leaving consolidation speed dependent on Google’s cautious wait-and-observe behavior for a status code that explicitly claims to be temporary. Reserve 302s for redirects that really are temporary, and if a “temporary” redirect ends up staying in place indefinitely in practice, correct it to a 301 once the permanence becomes clear rather than leaving a semantically inaccurate temporary status code in place long-term.
Hypothetically, imagine a furniture retailer, “Oakmere Living,” migrating from an old domain to a new one and, due to a platform default the dev team didn’t catch until after launch, discovers the entire migration was implemented with 302 redirects instead of 301s. A few weeks post-migration, rankings on the new domain might still be lagging noticeably behind where the old domain’s pages were sitting, consistent with Google treating the move cautiously rather than immediately consolidating signals to the new URLs. Once the team catches the misconfiguration and switches every redirect to a proper 301, the expected pattern, though not an overnight fix, would be Google’s confidence in the permanence of the move building faster than it would have under the original 302 setup, since the status code itself now matches the actual intent.
