The beginner's guide

Cold plunge, ice bath & contrast therapy explained

Three names, one idea: get cold on purpose. Here's what actually happens in an Ontario plunge studio, how long you're supposed to stay in, what contrast therapy adds, and who should sit this one out.

Cold plunge vs. ice bath — is there a difference?

In practice, barely. An ice bath is the old-school version: a tub filled with water and bags of ice, usually somewhere between 3°C and 10°C. A cold plunge is the modern version — a purpose-built, filtered, chilled tub that holds a set temperature (most Ontario studios run 3–10°C) without anyone hauling ice around. Same effect, cleaner water, consistent temperature. Studios use the terms interchangeably.

What is contrast therapy?

Contrast therapy is alternating hot and cold — typically a sauna or steam room followed straight away by a cold plunge, repeated for two to four rounds. The heat opens blood vessels, the cold clamps them shut, and the back-and-forth is what people are after. It's the format most Ontario recovery studios and Nordic spas are built around, which is why we flag sauna pairing on every listing — a venue with cold plunge only can't give you a full contrast circuit.

A typical first session

• Warm up first. 10–15 minutes in the sauna, or a light warm-up if there's no sauna.
• Get in slowly. Sit down, keep your hands out of the water at first, and breathe out longer than you breathe in. The gasp reflex passes in about 30 seconds.
• Stay in 1–3 minutes. Beginners often start at 30–60 seconds. Longer is not better — most protocols top out around 3 minutes per round.
• Warm back up naturally if you can — move around rather than jumping straight into a hot shower.
• Repeat. A contrast circuit is usually 2–4 hot/cold rounds, ending on cold (or hot, if you're heading straight outside in January).

How cold, and how often?

Most studios hold the plunge between 3°C and 10°C. Colder isn't automatically better — the useful thing is the discomfort you can stay calm inside of. A common starting point is two or three sessions a week, totalling roughly 10 minutes of cold across the week.

What to bring

Swimwear, a towel, and flip-flops. Most Ontario venues supply towels, robes and lockers; some Nordic spas require a bathing suit and provide everything else. Leave watches and jewellery in the locker — the cold makes rings slip.

Drop-in vs. membership: what you'll pay in Ontario

Two pricing models dominate. Drop-in gets you a single session or a timed circuit — the usual range in Ontario is roughly $25–$60, with Nordic spas at the higher end because you're paying for a full thermal-circuit day pass. Memberships run monthly and typically cover unlimited or a fixed number of visits, often $99–$250/month depending on whether sauna and other recovery services are included. Many studios also sell 5- or 10-visit packs that land in between. We list whatever each venue publishes — and say so plainly when they publish nothing.

Who should skip it

Cold water immersion is a real cardiovascular stressor, not just an uncomfortable bath. The cold shock response spikes heart rate and blood pressure within seconds. Talk to a doctor first — and in many cases don't plunge at all — if you have heart disease, high blood pressure, arrhythmia, Raynaud's, cold urticaria, epilepsy, or if you're pregnant. Never plunge alone, never after drinking, and get out immediately if you feel dizzy, numb in a way that doesn't fade, or unable to control your breathing.

This page is general information, not medical advice.