Quick answer: Practically they overlap — both are cold-water immersion. An ice bath usually means a tub you fill with water and ice (colder, less controlled, cheap to start). A cold plunge usually means a purpose-built tub, often with a chiller that holds a set temperature. The physiology is the same; the difference is convenience, temperature control and cost.
Ice bath
Cheap and accessible — a tub, water and bags of ice. The downsides are inconsistent temperature, the ongoing hassle of ice, and water that warms as you sit.
Cold plunge
A dedicated tub, frequently paired with a chiller and filtration, holding a precise temperature you can repeat every day. More money up front, far less faff.
Which should you choose?
Testing the habit? Start with an ice bath. Plunging regularly? A chiller-equipped plunge pays back in consistency and convenience. General wellness information, not medical advice.
Related answers
Shopping for a plunge or chiller? See our cold & heat therapy picks, or start with the complete cold plunge guide. General wellness information, not medical advice.
FAQ
Is a cold plunge the same as an ice bath?
The effect is the same cold-water immersion; a cold plunge is usually a dedicated, temperature-controlled tub while an ice bath is DIY with ice.
Is a cold plunge worth it over an ice bath?
If you plunge regularly, a chiller-equipped plunge holds a consistent temperature and removes the ice hassle.