December 2025 core update vs March 2026 core update
106 days separate the start of the December 2025 core update and the March 2026 core update. The March 2026 core update took 5.9 days less.
| December 2025 core update | March 2026 core update | |
|---|---|---|
| Type | Core update | Core update |
| Started | 11 Dec 2025, 17:25 UTC | 27 Mar 2026, 09:00 UTC |
| Finished | 29 Dec 2025, 19:00 UTC | 8 Apr 2026, 13:00 UTC |
| Rollout | 18 days, 1h | 12 days, 4h |
| Against the median core update | 2.9 days longer | 2.9 days shorter |
| Day it began | Thursday | Friday |
| Other events overlapping | 0 | 0 |
| Archived coverage | 0 headlines | 1 headlines |
The March 2026 core update in brief
The March 2026 core update ran from 27 March to 8 April. A week after it finished, Search Engine Land reported that it was more volatile than the December 2025 core update, with close to 80% of top results changing position.
About this comparison
Dates and times are Google's own, in UTC. Rollout lengths and the comparison with the median are calculated here. "Archived coverage" counts headlines this site captured that name the update type, from two days before the start to ten days after the finish — it reflects what this archive held at the time, not total coverage.