Where to see Mass Coral Spawning in 2026
Synchronized broadcast spawning of stony corals, typically a few nights after a full moon in late spring or summer.
Best months
Difficulty & experience
Open Water + Night specialty. Comfort with low-vis night reef diving and minimal-light protocols.
Best locations
- Cod Holeprimary
Australia
Spawning is well-documented a few nights after the November or early-December full moon.
- Ningaloo Reefprimary
Australia
March–April spawning event tied to autumn full moon, distinct from the GBR season.
Sites at these locations
- SS Yongala
Cod Hole, Australia
A 110 m steel passenger steamer that vanished in a cyclone in March 1911 with all 122 on board, now lying intact on her starboard side on a sandy bottom in the open Coral Sea, roughly 22 km east of Cape Bowling Green and 90 km southeast of Townsville. The hull rises from 30 m sand to about 16 m at the highest stanchions, isolated from any reef, which concentrates pelagic life on the wreck like nowhere else on the Great Barrier Reef. Queensland groupers the size of small cars, schooling barracuda, eagle rays, mantas, olive sea snakes, bull sharks and a resident humphead wrasse all work the structure. Penetration is illegal — it is a protected gravesite.
- Ningaloo Whale Shark Encounter
Ningaloo Reef, Australia
Snorkel-only encounter with whale sharks that aggregate along Ningaloo Reef from March to August. Spotter planes vector boats onto sharks; you slip in alongside them for a few minutes before they cruise on. Strictly regulated for shark welfare.
- Cocklebiddy cave
Ningaloo Reef, Australia
Cocklebiddy Cave is a world-renowned, extremely challenging technical cave diving site located in the remote Nullarbor Plain of Western Australia. Known for its extensive underwater passages and pristine geological formations, it attracts experienced technical divers seeking exploration in one of the longest underwater cave systems. The site offers a unique opportunity to witness untouched subterranean environments.
- Cod Hole
Cod Hole, Australia
Far northern Great Barrier Reef site where divers come face to face with potato cod the size of small cars. Years of friendly interaction means the resident pack greets boats. Surrounding bommies host the full Coral Sea reef community.
- Navy Pier Exmouth
Ningaloo Reef, Australia
Active naval pier converted into one of the highest-density biomass dive sites in the world. Grouper, wobbegongs, and resident grey nurse sharks shelter under the structure; macro life in the pylons rivals Lembeh. Access controlled by the Australian Defence Force.
- Lizard Island
Cod Hole, Australia
Lizard Island, located in the northern reaches of the Great Barrier Reef, offers exceptional diving opportunities amidst vibrant coral gardens and diverse marine life. Encounter schooling fish, reef sharks, and an array of colorful invertebrates in this remote and pristine environment. The island serves as a gateway to exploring iconic dive sites, providing a true immersion into one of the world's most renowned natural wonders.
Plan a trip
Methodology
How we picked these locations
We use the sighting-occurrence-cluster methodology: encounter regions are ranked from primary to closed based on documented occurrence records, operator continuity, and regulator permit status. We never publish per-trip sighting probabilities — “best” here means the most reliably documented region for this encounter, not a guarantee.
We aggregate confirmed occurrence records from GBIF and OBIS within a fixed radius of each dive site. Occurrence records confirm presence and reveal seasonality clustering, but they DO NOT measure per-dive probability — there is no eligible-effort denominator. We deliberately do not publish a numeric '% chance of sighting' from this data.
Exact night varies year to year and locally. Predictions are operator-tracked, not published as probabilities.