The best cold plunge tub for most backyards is one that fits your base, your climate and how often you plunge. For a full-body soak outdoors, our pick is the Polar cedar tub at $3,444. For a small deck, the Baltic costs $2,554.50 and stands upright.
Most "best of" lists only test stainless, acrylic and inflatable tubs. This guide covers what they skip: cedar tubs, the weight of a filled tub, how much ice you really need and what happens in winter. All prices and specs come from our own product pages.
Key takeaways
- For a full-body soak outdoors, the Polar ($3,444) is our pick; for a small deck, the upright Baltic ($2,554.50).
- A filled Baltic weighs about 1,210 lbs, a filled Polar about 1,990 lbs: plan a pad, not a standard deck.
- Without a chiller, budget roughly 70 lbs of ice (Baltic) or 100 lbs (Polar) for a 10°F drop.
- Baltic and Polar take a chiller later; the Flow is built around one. We do not sell chillers.
- Drain or run a rated chiller before hard freezes; the Polar has a garden-hose drain.
Our picks at a glance
| Pick | Best for | Water | Chiller | Price |
|---|---|---|---|---|
| Polar | Full-body soak, most backyards | 190 US gal | Optional, sold separately | $3,444 (stainless liner $6,428) |
| Baltic | Small decks and patios | 132 US gal | Optional, sold separately | $2,554.50 |
| Flow | Chiller hidden in the cedar | Not listed | Built-in bay, chiller sold separately | $7,850 (clear cedar $8,336) |
| Sweaty Yeti Plunge Max | A heated plunge room | Room with 1 tub, 2nd optional | Integrated chiller and heater | From $44,400 |
We sell these four, so we only rank these four. We do not test other brands. If you want to compare stainless chiller units from other makers, the same checks below still apply.
Which type of cold plunge tub is best: cedar, stainless, plastic or inflatable?
For example, cedar tubs look like outdoor furniture and keep a liner inside that holds the water. Stainless and acrylic units are mostly sold with a chiller. Meanwhile, inflatable tubs cost the least but are the easiest to puncture. Choose by where the tub will live.
Our cedar tubs use solid Eastern White Cedar outside. Inside, the Baltic has a 3/8" HDPE plastic liner. The Polar comes with a white HDPE or a 304 stainless liner, and the Flow has a stainless tub. So you get the look of wood and a liner that is easy to wipe clean.
Besides, a cedar tub matches a cedar sauna. If you already own a barrel sauna, the Polar and the Baltic share the same wood and banding style.
How much does a filled cold plunge tub weigh?
Water weighs about 8.34 pounds per gallon. A full Baltic holds roughly 1,100 lbs of water, and a full Polar roughly 1,585 lbs. Add the tub and one adult, and you are planning for well over half a ton on a small footprint.
The 8.34 lb figure comes from the USGS Water Science School. Here is what that means for your base:
| Tub | Water | Dry weight | Filled, before you get in | Load on its footprint |
|---|---|---|---|---|
| Baltic (Ø 37.5") | ~1,101 lbs | ~108 lbs | ~1,210 lbs | ~158 lbs per sq ft |
| Polar (71" x 32.25") | ~1,585 lbs | ~402 lbs (crate) | ~1,990 lbs | ~125 lbs per sq ft |
Typical residential decks are designed for a 40 lbs per sq ft live load, according to the American Wood Council's DCA 6 deck guide. A filled tub puts three to four times that on one spot. So put it on a concrete pad or compacted gravel, or have a deck checked by an engineer first. The Polar needs a level base of at least 34" x 72".
How much ice does a cold plunge tub need without a chiller?
To cool a full Baltic from 60°F to 50°F, plan on roughly 70 lbs of ice. A full Polar needs roughly 100 lbs for the same drop. On a warm day, or from warmer tap water, you need more.
In fact, the math is simple. Cooling one pound of water by 1°F takes 1 BTU. Melting one pound of ice absorbs about 144 BTU (Engineering ToolBox), and the meltwater then absorbs about 18 BTU more as it warms to 50°F. So each pound of ice removes roughly 162 BTU.
- Baltic: 1,101 lbs of water x 10°F = 11,010 BTU, so about 68 lbs of ice.
- Polar: 1,585 lbs of water x 10°F = 15,850 BTU, so about 98 lbs of ice.
- From 65°F tap water to 50°F, the Baltic needs about 102 lbs.
Note that these are lower limits. Sun, air and the tub itself add heat. If you plunge several times a week, a chiller usually makes more sense than buying ice. For target temperatures, see our cold plunge temperature chart.
Can you add a chiller to a cold plunge tub later?
Yes, with the Baltic and the Polar. Both work with ice on day one and accept an optional electric chiller later. The Flow is built around a chiller bay, so you buy a compatible chiller with it. We do not sell chillers ourselves.
The Flow's bay is designed for a compatible unit such as the Coldture Chiller Pro. Its warranty comes from the chiller maker, and the tub warranty excludes the chiller. If you want to compare setups, read cold plunge tub with chiller vs ice.
Can you keep a cold plunge tub outside in winter?
Yes, but standing water can freeze in a cold snap. Either run a chiller that the maker rates for your climate, or drain the tub before hard freezes. The Polar has a garden-hose drain, which makes that a short job.
Overall, cedar handles snow and wet seasons well, since the wood resists moisture and rot. Still, keep the base level and well drained so water never sits under the tub. Some regions stay cold enough to plunge without ice for months. Our cold-plunge-ready states study shows where.
Which cold plunge tub should you buy?
- Choose the Polar if you want to lie back with your body under water and you have room for a 34" x 72" base. Pick the stainless liner if you prefer metal inside.
- Choose the Baltic if space is tight. It stands 43.75" tall on a 37.5" circle, ships fully assembled and has the lowest price.
- Choose the Flow if you plan to use a chiller every day and do not want to see it. It ships fully assembled.
- Choose the Sweaty Yeti Plunge Max if you want a heated, insulated room with an integrated chiller, room for a second tub and an optional shower.
Pairing it with a sauna? See our sauna and cold plunge setup guide and the sauna and cold plunge collection.
Cold plunge tub FAQ
Do cedar cold plunge tubs leak?
The water sits in a liner, not against the wood. The Baltic's HDPE liner is hand-welded and leak-tested, and the Baltic, Polar and Flow each carry a 5-year manufacturer warranty on the tub.
Is shipping included?
The Baltic, Polar and Flow ship with free curbside freight in the lower 48. Sweaty Yeti includes the first 250 miles of transport and quotes the rest per mile.
What is the difference between a cold plunge and an ice bath?
A cold plunge tub is a dedicated tub you keep cold with ice or a chiller. Our guide What is a cold plunge? explains the terms.
Can I build one myself instead?
Yes, a stock tank build is cheaper. Our DIY cold plunge guide covers the costs and when buying a tub is the better call.
Ready to compare sizes in person? Browse all cold plunge tubs or read the cold plunge tub buying guide. Questions about your base or a chiller? Call us at +1 (307) 309-8328.