Stinger Season

July 22, 2025 | Cairns, Family Travel, Great Barrier Reef, Travel Tipsbox jellyfish, irukandji, Marine Life, reef safety, safe travel, Stinger Suit

Stinger Season in Cairns: Stay Safe, Stay Informed

Stinger season in Cairns runs from November through May. During this time, tropical jellyfish—including dangerous species like the box jellyfish (Chironex fleckeri) and tiny but venomous Irukandji—can be present in coastal and reef waters . Sightings are more common close to shore, but Irukandji can occur around the reef and islands as well, which is why reef operators provide stinger suits during the season.

Which Stingers Are Dangerous?

Box Jellyfish are among the world’s most lethal jellyfish. They have long tentacles packed with potent venom that can cause excruciating pain or even death in minutes.
Irukandji Jellyfish are much smaller than box jellyfish and can trigger severe systemic reactions known as Irukandji syndrome, including intense pain, nausea and high blood pressure. Symptoms can begin up to 30 minutes after a sting that seemed mild at the time.

How Cairns Keeps You Safe

Stinger nets are deployed at popular beaches such as Palm Cove, Port Douglas, Yorkeys Knob, Kewarra Beach and Trinity Beach during the season.
Nets reduce risk but do not remove it. They are designed to keep out large box jellyfish and cannot keep out the much smaller Irukandji, so wear a stinger suit even inside a netted enclosure.
Stinger suits (lycra or wetsuits) offer excellent protection—highly recommended even when nets are in place.

Top 5 Tips to Stay Safe

Swim inside stinger nets and between red-and-yellow flags on patrolled beaches.
Wear a stinger suit whenever you enter the water during the season, including inside a netted enclosure.
Carry vinegar. Douse a sting for at least 30 seconds before picking off tentacles, and call Triple Zero (000) if the sting is more than a single small one or the person is unwell.
Follow lifeguard advice at all times and never swim when beaches are closed—even if the water looks calm.

Common Questions (FAQs)

Can I swim in Cairns during stinger season?

Only with care. Swim at a patrolled beach inside a stinger net, between the red and yellow flags, and wear a stinger suit. Nets are designed to keep out large box jellyfish but cannot keep out the much smaller Irukandji, so a suit matters even inside the net.

When does stinger season end?

Stinger season runs from November to May, when the risk is highest. Stings have been recorded at all times of the year in tropical Queensland, so follow current local signage and lifeguard advice whenever you swim.

Are reef tours safe during stinger season?

Reef operators provide stinger suits during the season and follow marine stinger procedures. Irukandji can occur around the reef and islands, so a suit reduces the risk rather than removing it. Wear it whenever you are in the water and follow the crew’s instructions.

What if I get stung?

Get the person out of the water. If it is more than a single small sting, or they look or feel unwell, call Triple Zero (000) for an ambulance and be ready to start CPR if they are unresponsive and not breathing normally. Douse the stung area liberally with vinegar for at least 30 seconds, then pick off any remaining tentacles. Vinegar is for tropical stings — do not use it on a bluebottle sting. With no vinegar, pick off the tentacles and rinse well with sea water, never fresh water. A cold pack helps with pain. Keep watching the person: an Irukandji sting can seem mild and then turn severe within 30 minutes, and needs urgent medical care.

Can I swim somewhere away from marine stingers?

The Cairns Esplanade Lagoon is patrolled, free, open year round and has no marine stingers. Freshwater swimming holes and creeks are not an equivalent answer: they carry their own risks, including crocodiles in some waterways and flash flooding after rain, so check current advice for each site.

Stinger season doesn’t mean skipping the reef. Reef Experience departs Cairns Marina daily for a full day on the Outer Reef, with a free scuba dive included alongside snorkelling, a marine biologist on board and a buffet lunch — from $290 per person, including the fuel levy. See how reef tours handle stinger season →

Final Tip

Don’t let stinger season spoil your tropical adventure! With simple precautions and smart planning, you can enjoy Cairns’ reef, beaches, and rainforest all year long. Local operators and lifeguards are there to help, with nets, suits and current local advice. Check the beach signage and ask the lifeguards on the day.

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