What · Pulse
Did the fourth global coral bleaching event end? What NOAA says now
NOAA Coral Reef Watch says the fourth global mass coral bleaching event likely ended in 2025. That does not mean reefs are now free from local heat stress or bleaching risk.
‘Likely ended’ is NOAA’s current global status
NOAA and the International Coral Reef Initiative confirmed the fourth global bleaching event in April 2024. NOAA’s current Coral Reef Watch update, dated 2 June 2026, says the global event likely ended in 2025.
The tracked period from 1 January 2023 through 30 September 2025 exposed about 84.4 per cent of global coral reef area to bleaching-level heat stress, with mass bleaching documented in at least 83 countries and territories.
Ending the global event does not end local bleaching
A global-event designation describes widespread synchronized heat stress; it is not an all-clear for every reef. A reef can still experience marine heatwaves, bleaching or disease after the global event threshold is no longer being met.
That is why NOAA Coral Reef Watch continues to publish near-real-time sea-surface temperature, HotSpot, Degree Heating Week and Bleaching Alert Area products.
What a traveller should check now
Before a reef trip, check current local operator guidance, weather and official reef advisories—not only a headline about the global event. Heat stress can change during a season.
If managers close a site or recommend avoiding stressed areas, treat that as a live ecological condition rather than an inconvenience to work around.
Before you decide
Keep these five things with you.
- 01Use the exact phrase ‘likely ended’
- 02Keep the 2023–2025 global period distinct from 2026 local conditions
- 03Check NOAA’s near-real-time products
- 04Follow local reef-management notices
- 05Avoid treating bleaching status as a tourism guarantee
How this story earns trust
Sources, method and relationship—visible.
Each reference is tagged by the geography and authority of the source. Country-specific evidence is never presented as a global rule.
Method
This Pulse article uses NOAA Coral Reef Watch’s current global status update and live monitoring portal. It preserves NOAA’s uncertainty word ‘likely’ and separates global-event status from local reef conditions.
Commercial relationship
Independent editorial. NOAA, tourism operators and reef attractions did not pay for inclusion.
Correction or improvement
Found a mistake, a missing perspective or a source we should review? Send it to the editorial desk ↗
- 01Current Global Bleaching: Status Update & Data Submission ↗
NOAA Coral Reef Watch. 2 June 2026 status update stating the fourth mass bleaching event likely ended in 2025 and reporting the 84.4% exposure estimate.
- 02NOAA Coral Reef Watch near-real-time products ↗
NOAA Coral Reef Watch. Current satellite monitoring products for heat stress and bleaching alerts.
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Did the fourth global coral bleaching event end? What NOAA says now
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Made for personal and editorial sharing with Eight June attribution. Facts are shortened for the card; the article carries the full context, method and sources.
Useful questions
Quick answers,
kept specific.
Does ‘likely ended in 2025’ mean coral bleaching stopped everywhere?
No. It refers to NOAA’s global-event assessment. Individual reefs can still experience bleaching-level heat stress after the global event.
Was the fourth event the largest on record?
NOAA says yes: about 84.4% of the world’s coral reef area experienced bleaching-level heat stress during the tracked 2023–2025 period.