Cold water shock: What it is and how to protect yourself

Our state is a paradise of crystal-clear waterways. From the Strait of Juan de Fuca to Spokane’s lakes and rivers, Washington caters to kayaking, paddleboarding, swimming windsurfing, diving and all water sports. But while there are a lot of ways to describe the wonders of our waters, one thing you’ll likely never hear is that they’re warm. Cold water shock is a real risk in Washington, so it’s important to buoy yourself with the information to protect yourself and your friends before your next water-based adventure.

A shock to the system: Sudden cold water immersion in Washington waters

Temperatures in Puget Sound rarely rise above the mid-50s, and most of our lakes and rivers are fed by snowmelt or glaciers. Even water temperatures in the 70s can cause cold water shock if someone goes overboard on a nice sunny day.

What is cold water shock?

Cold water shock is an immediate, involuntary and incapacitating reaction to being dropped into frigid waters. It is unlike hypothermia, which sets in slowly.

How it affects the body

Falling in cold water triggers a sudden, uncontrollable gasp for air. When the person goes underwater, they gasp for air, but inhale water and start drowning.

The shock of the water temperature will cause hyperventilation. That can lead to flailing and inhaling more water. Meanwhile, heart rate and blood pressure can spike, sometimes dangerously. Within a few minutes, nerves and muscles start to cool, causing loss of hand, arm and leg function for the person in the water.

A group of kayakers paddle on the Little Spokane River with lush vegetation on either side of the river banks. — Wearing a life jacket is the single most important action you can take to protect yourself in the event of cold water shock.

Preventative measures:

Wear a life jacket

This is the single most important action you can take. A properly fitted life jacket keeps your head above water during the involuntary gasp phase. It also allows you to float without using energy.

Use a buddy system

Never boat or paddle alone. Make sure you file a float plan and carry two forms of waterproof communication.

The 1-10-1 Rule

If you fall in, the 1-10-1 rule refers to how much time you have to regulate your bodily functions before cold water shock affects your actions.

1 minute: Control your breathing.

Your immediate goal is to regulate your breath. Do not panic and resist the urge to start swimming. You have about a minute to prevent or stop yourself from hyperventilating. Float on your back to keep your mouth and nose clear of the water. Let the initial shock pass.

10 minutes: Self-rescue or flotation.

You then have about 10 minutes before your muscles lose function. Orient yourself and assess your situation. If you can, try to re-board your boat or grab onto floating or stable object. If you cannot reach safety quickly, stay put. On land, people survive frozen temps by moving their bodies. In the water, your strategy is the opposite. Stay still. Cross your hands over your chest, bring your knees up and tuck your hands under your armpits for warmth. Use your life jacket to keep your head above water.

1 hour: Hypothermia.

After about 30 minutes, hypothermia becomes the biggest threat. You’ll have about an hour of useful consciousness and will depend on your life jacket for flotation as you wait for a rescue.

Cold water shock is a real risk when recreating in Washington, so knowing what it is and how to react is an important part of planning your adventure. Next time you're heading out on or near the water, remember these tips, share them with your friends and family and be safe!

Originally published March 10, 2026