Cold Plunge
Polar Bear Plunge: The Tradition, the Real Risks, and How to Do It Safely
A polar bear plunge — also called a polar bear swim or dip — is a brief dash into cold outdoor water, most often on New Year's Day, done for charity, tradition and the sheer thrill of it. It is a fixture of the Canadian winter: Vancouver's 106th Polar Bear Swim ran at English Bay on January 1, 2026, and Oakville's Courage Polar Bear Dip is now in its 41st year. The rush is real, but so is the danger — sudden cold triggers the cold-shock response within the first 30 to 60 seconds, an involuntary gasp that is the leading cause of cold-water drowning. Done at a supervised event, briefly, it can be a great memory; done carelessly, it can be deadly.
Key Takeaways
- What it is: a short, cold-water dip — polar bear plunge, swim or dip — usually on New Year's Day, for charity, tradition or a thrill, not a health treatment.
- A Canadian tradition: Vancouver's swim hit its 106th year in 2026; Oakville's Courage Dip its 41st; many raise funds for causes like Special Olympics.
- The real danger: the cold-shock response peaks in the first 30 to 60 seconds — an involuntary gasp that can lead to inhaling water and drowning.
- Not for everyone: the American Heart Association warns cold water is risky for people with heart disease or high blood pressure.
- Do it safely: supervised event, never alone, keep it short, don't dive, and get out the moment you feel numb.
- For year-round cold training without open-water hazards, a controlled option from the Calore cold plunges collection lets you ease in gradually.
What is a polar bear plunge?
A polar bear plunge is an organized event where people run or wade into a cold body of water in the depth of winter, then rush straight back out. The names shift by region — polar bear swim on the west coast, polar bear dip in much of Ontario — but they all describe the same thing: a short, deliberate cold-water immersion, usually done in a crowd and usually on the first day of the year.
It is a celebration and a dare, not a wellness protocol. Most participants are in the water for seconds, not minutes, and the point is the shared moment — the screaming, the costumes, the collective courage — rather than any measured health benefit. As Wikipedia's entry on the polar bear plunge notes, it is a winter tradition found across Canada, the United States, Europe and the Nordic countries.
History and the Canadian New Year tradition
In Canada, the polar bear plunge is above all a New Year's Day ritual — a way to wash off the old year and start the new one wide awake. The events are decades-old community institutions, not fads.
The best-known is the Vancouver Polar Bear Swim at English Bay, which returned for its 106th edition on January 1, 2026 — one of the oldest and largest such events in the world. In Ontario, Oakville's Courage Polar Bear Dip at Coronation Park reached its 41st year in 2026, and Thunder Bay's PDR Polar Bear Plunge and Toronto's Boost for Kids dip draw crowds each January. Cities from Toronto to Montreal ring in the year with televised plunges into the harbour or the St. Lawrence.
Stat: The Vancouver Polar Bear Swim reached its 106th year on January 1, 2026 at English Bay Beach, and Oakville's Courage Polar Bear Dip its 41st — two of Canada's longest-running New Year cold-water traditions (City of Vancouver; polarbeardip.ca).
Why people take the plunge
People plunge for three overlapping reasons: charity, tradition, and the thrill. Understanding which one is driving you helps you do it for the right reasons — and safely.
Charity and fundraising
Many Canadian plunges are fundraisers first and stunts second. Participants collect pledges and jump in to raise money for causes — Special Olympics Ontario's Polar Plunge is the biggest example, and events in Thunder Bay, Oakville and Toronto channel funds to local charities. The cold is the price of admission for a good cause.
Tradition and a fresh start
For a lot of families, the New Year's dip is simply what you do on January 1 — a symbolic reset shared with a community year after year. The ritual matters more than the temperature.
The thrill and the after-buzz
There is also the sheer adrenaline. Cold water sets off a flood of noradrenaline and endorphins, and people climb out feeling euphoric, clear-headed and proud. That buzz is genuine — it is just important to separate a fun once-a-year rush from any claim of lasting health benefit, which for cold-water immersion remains an area of ongoing research rather than settled science.
What happens to your body in cold water
The instant you hit near-freezing water, your body launches the cold-shock response — and understanding it is the whole key to plunging safely. It unfolds in a predictable, fast sequence.
- The gasp reflex (0–3 seconds). An involuntary, deep gasp fires the moment cold water hits your skin. If your head is underwater at that instant, you inhale water — this is why cold-shock, not hypothermia, is the leading killer in cold water.
- Uncontrollable breathing (first 30–60 seconds). You hyperventilate and cannot easily hold your breath. Panic here is common and dangerous.
- The cardiac spike. Blood vessels clamp shut, heart rate and blood pressure surge, and the heart's workload jumps — the reason cold plunging is risky for anyone with heart disease.
- Cooling muscles (a few minutes in). Arms and legs weaken and stop responding, making swimming and climbing out progressively harder.
The RNLI's guidance on cold-water shock is blunt: the effects peak in the first minute, and the safest response is not to thrash but to fight the urge to panic, keep your airway clear, and let the gasp reflex pass before trying to move. That is far easier to do when you have eased in on purpose than when you have jumped off a dock.
The real risks of open-water cold plunging
An open-water polar bear plunge carries genuine, sometimes fatal risks that a warm-weather swim does not. These are not reasons to never take part — they are reasons to take it seriously and only do it at a supervised event.
Safety notice — please read before you plunge. Cold-water immersion can be dangerous even for healthy people. The cold-shock response triggers an involuntary gasp and rapid breathing that can cause you to inhale water and drown, especially if you dive or your head goes under. Cold water also spikes heart rate and blood pressure: the American Heart Association warns it can be dangerous for anyone with heart disease or high blood pressure. Only plunge at an organized event with lifeguards; never go alone; keep it very short; do not dive or jump — wade in feet-first; avoid alcohol before and after; and get out immediately if you feel numb, dizzy, confused or your limbs stop working. If you have a heart condition, high blood pressure, are pregnant, or are unsure, talk to your doctor first — or skip the water. If someone is in trouble, call for the lifeguards; do not attempt an untrained open-water rescue.
| Risk | What happens | How events manage it |
|---|---|---|
| Cold-shock / drowning | Involuntary gasp and hyperventilation in the first 30–60 seconds; inhaling water if the head submerges | Shallow, feet-first entry; lifeguards; no diving; keep the head up |
| Cardiac strain | Sharp spike in heart rate and blood pressure as vessels constrict | Screening advice for heart conditions; short duration; medics on site |
| Hypothermia | Core cooling if you stay in too long or don't rewarm | Seconds-long dips; warm shelter, towels and dry clothes ready |
| Loss of muscle control | Arms and legs weaken, making it hard to swim or climb out | Water shallow enough to stand; staff helping people out |
| Open-water hazards | Slippery banks, hidden drop-offs, currents, thin ice | Cleared, roped-off entry zones and marshals |
How to do a polar bear plunge safely
If you are healthy and want to take part, the goal is simple: get the memory without becoming a rescue. Follow these steps, drawn from Canadian Red Cross and lifesaving guidance.
- Choose an organized, supervised event. Pick a plunge with lifeguards, roped-off entry and medics — like a registered charity swim — rather than an impromptu dock jump.
- Never go alone. Always have spotters or lifeguards present, and never let anyone plunge unwatched.
- Wade in feet-first — don't dive or jump. Diving puts your head underwater exactly when the gasp reflex fires. Walk in slowly and keep your head above the surface.
- Keep it short. Seconds, not minutes. Get in, feel it, get out — the first minute is the riskiest, so there is no reward for lingering.
- Breathe, don't panic. Expect the gasp and rapid breathing; the skill is to stay calm and let it pass rather than thrash.
- Skip the alcohol. It impairs judgment and speeds heat loss, raising the risk of hypothermia — before and after the plunge.
- Warm up fast. Have towels, warm dry clothes and a hot drink ready, and get out of the wind immediately.
- Get out at any warning sign. Numbness, dizziness, confusion or limbs that stop working mean leave the water now and rewarm.
Even with every precaution, an open-water plunge is a moment of managed risk. The Canadian Red Cross stresses supervision, brevity and rapid rewarming as the non-negotiables of a safe plunge.
Why a controlled cold plunge is a safer year-round alternative
If what draws you to the polar bear plunge is the cold itself — the rush, the reset, the resilience — a purpose-built cold plunge gives you all of that with the open-water dangers removed. The difference is control.
In a controlled plunge you lower yourself in gradually at a temperature you set, in shallow water, at home, with no waves, currents, drop-offs or crowds. That means you can breathe through the cold-shock response deliberately instead of being ambushed by it — and you can train cold exposure a little at a time, all year, rather than shocking an unprepared body once every January.
| Factor | Open-water polar bear plunge | Controlled cold plunge |
|---|---|---|
| Entry | Sudden, often a run or jump — head can submerge | Gradual, feet-first, head stays up |
| Temperature | Whatever the lake or ocean is | Set and consistent — you choose it |
| Drowning hazards | Waves, currents, drop-offs, thin ice | Shallow, contained, no open-water hazards |
| Supervision | Requires lifeguards and a crowd | Short, supervised sessions at home |
| Frequency | Once a year on a whim | Year-round, building tolerance gradually |
None of this makes cold water risk-free — the same heart-rate and cold-shock rules still apply, so ease in and never plunge alone. But it removes the specific hazards that make open-water plunges dangerous. You can compare purpose-built, temperature-controlled options like the Elite luxury cold plunge in the wider cold plunges collection, and pair it with a sauna for a warm-up-then-cool-down contrast ritual you control from start to finish.
The Honest Verdict
A polar bear plunge is a wonderful Canadian tradition — a bold, communal, once-a-year rush that raises real money for good causes. It is also genuinely dangerous if you treat it casually: the cold-shock response in the first 30 to 60 seconds is the leading cause of cold-water drowning, and the cardiac spike makes it unsafe for some people entirely. If you take part, do it at a supervised event, wade in feet-first, keep it short, and warm up fast. Key finding: the thrill of a plunge is the cold, not the open water — so if you want the cold-exposure benefits without the drowning risk, a controlled, gradual cold plunge you can use year-round is the safer way to chase it. Explore temperature-controlled options in the Calore cold plunges collection.
Frequently Asked Questions
What is the purpose of a polar bear plunge?
A polar bear plunge is a brief dash into cold outdoor water, usually on New Year's Day, done for three main reasons: to raise money for charity, to mark a fresh start with a shared tradition, and for the thrill and bragging rights. Many Canadian plunges are organized fundraisers for causes like Special Olympics. It is a one-off community event, not a health treatment — the buzz you feel is mostly the cold-shock response and the rush of doing something bold with a crowd.
How long do you stay in the water during a polar bear plunge?
Very briefly — most people are in and out within seconds, and safety guidance is to keep it well under a couple of minutes. At near-freezing temperatures the danger is not gradual hypothermia in that short window; it is the immediate cold-shock response, which peaks in the first 30 to 60 seconds and can cause uncontrollable gasping. The safest plunge is a quick dip and a fast exit to warm, dry clothes. Longer is not braver — it is riskier.
What are the risks of a polar bear plunge?
The biggest risk is the cold-shock response: sudden immersion in cold water triggers an involuntary gasp and rapid breathing, which can lead to inhaling water and drowning if your head goes under. Cold water also spikes heart rate and blood pressure, which is dangerous for anyone with heart disease or high blood pressure, and it quickly saps muscle strength so swimming and climbing out get harder. Open water adds slippery banks, hidden drop-offs and cold that numbs you fast. This is why organized events use lifeguards and shallow, controlled entry.
Is a polar bear plunge safe for everyone?
No. Cold-water immersion sharply raises heart rate and blood pressure, so the American Heart Association warns it can be dangerous for people with heart disease, and anyone with a heart condition, uncontrolled high blood pressure, or who is pregnant should talk to a doctor first or skip it. Children, older adults, non-swimmers and anyone who has been drinking alcohol are at higher risk. If you are healthy and still want to take part, do it at a supervised event with lifeguards — never alone in open water.
What happens to your body during a polar bear plunge?
The moment you hit cold water your body triggers the cold-shock response: an involuntary gasp, a burst of rapid breathing you cannot fully control, and a spike in heart rate and blood pressure as blood vessels constrict. A rush of adrenaline and noradrenaline follows, which is why people feel euphoric and wide awake afterward. Within a few minutes your muscles start to cool and weaken. The gasp and the heart spike are exactly why the first 30 to 60 seconds are the most dangerous part.
Is a controlled cold plunge safer than a polar bear plunge?
Yes, in the ways that matter for risk. A purpose-built cold plunge lets you lower yourself in gradually at a set temperature you choose, in shallow water, at home, with no waves, drop-offs or crowds — so you can breathe through the cold-shock response instead of being ambushed by it. It also lets you train cold exposure year-round and build tolerance slowly, rather than shocking an unprepared body once a year. It is not risk-free, but it removes the open-water drowning hazards that make polar bear plunges dangerous.
