Hawaiʻi’s 100-Yard Whale Rule Includes Swimmers

Most of us think of whale rules as something for captains. Distances, engines, speeds. Not something for a person in a swimsuit with a mask.

In Hawaiʻi, that thinking is wrong. A swimmer who heads towards a humpback is approaching it, exactly like a boat, and the same 100 yards apply. Once you understand why, a beach day with whales starts to feel different.

A swimmer is not an exception

NOAA’s Hawaiian Islands Humpback Whale National Marine Sanctuary states that approaching humpback whales is prohibited within 100 yards (90 m) when on or in the water, and within 1,000 feet (300 m) when flying an aircraft.

The rule applies “by any means”. NOAA even gives examples: a person in the water, stand-up paddleboards, kayaks, canoes, boats and drones. NOAA Fisheries says the same in its Hawaiʻi viewing guidance. Federal law prohibits approach within 100 yards, by boat, kayak, drone, when swimming, or by any other means.

So the 100-yard rule for swimmers is not a grey area. If you swim towards a humpback, you are approaching it.

Why the whales are here in winter

Humpback whales are generally seen in Hawaiʻi from November through April, with the peak from January through March. Each winter and spring, approximately half of the North Pacific humpback whales visit the waters around the islands.

They do not come on holiday. While here, they compete for mates, mate, give birth and nurse newborn calves.

That is why the rules matter so much. Many of the whales you see close to shore may be mothers with young calves, resting in shallow water. We wrote about why whale rules get stricter around mothers and calves, because these pairs need extra space more than anyone.

What does 100 yards mean on a beach day?

One hundred yards is roughly the length of a football pitch. From the water, with your eyes at the surface, it is very hard to judge. A whale that looks far away can be much closer than you think, and a moving whale can close the gap quickly.

So the simple answer is this. You do not need to swim towards a whale because someone on the beach called out that it is close. Stay where you are or go back to shore, keep your distance and follow local guidance. If you are on a paddleboard or a kayak, stop paddling towards it.

If a whale moves towards you on its own, stop and give it space. NOAA’s boating guide tells boat operators to stop immediately if they are within 100 yards, and to leave engines running and out of gear until the whale moves away. The same calm idea works for a swimmer. Stay still, do not follow, let it pass.

Different animals, different distances

NOAA Fisheries gives separate guidance for each protected animal in Hawaiʻi, and they are not the same.

For Hawaiian spinner dolphins, federal law prohibits swimming with, approaching or remaining within 50 yards. This rule came into effect on 28 October 2021. It applies within 2 nautical miles of shore in the main Hawaiian Islands and covers any boat, person or object. The dolphins rest in bays near the shore during the day, and disturbance interrupts that rest.

For monk seals, the guidance is at least 50 feet, and at least 150 feet for a mother with a pup. For sea turtles, it is at least 10 feet, on land and in water.

So 50 yards is not a smaller humpback rule. Each distance belongs to its own animal.

Can watching still feel intimate?

Yes. A breath carried across the water. A fluke lifting slowly. The long pause before the whale surfaces again. These moments do not become better just because the camera fills the frame.

A lawful boat watch or a quiet view from land leaves the whale room to behave without us. NOAA’s own advice is gentle and practical: watch from a distance, use binoculars or your camera’s zoom for a close look, never touch, chase or feed, and limit viewing time to a few minutes.

If you go out by boat, choose operators who slow down in whale areas. NOAA recommends a maximum of six knots within 400 yards of whales and when leaving. Keep your voice low, and use binoculars instead of asking the skipper to move closer.

On the beach, the rest is simple. I bring a hat, water and a mineral sunscreen. Watching from the sand, with your feet in the water, can be the best seat of all.

Wildlife encounters are unpredictable. Whale watching should always follow local regulations and experienced professional guidance.

What this means for your trip

If a tour in Hawaiʻi suggests getting into the water to close the gap with a humpback, that is not something Ocean Calling offers. We only plan in-water time with humpbacks where the local rules allow it, which is why our Moʻorea whale retreat exists, and why the group stays small.

For more about the whales themselves, our humpback whale Atlas page is a quiet place to start.

Questions people ask

Wildlife encounters are never guaranteed and never forced. Ocean Calling works only with vetted, ethical local operators, and every animal is free to approach, or not, entirely on its own terms.