Can You Leave an Inflatable Hot Tub Out in Winter?
Short answer: it depends on your winter, and on whether the tub stays plugged in. I know that’s not the yes/no you wanted, but anyone who gives you a flat “sure, it’s fine!” is ignoring what a hard freeze does to a hot tub pump.
There are really three different questions hiding inside this one, so let’s take them one at a time.
Scenario 1: Using it all winter (the dream)
If your winters are mild — think lows that rarely dip below freezing — you can absolutely keep soaking through the season. Three things to know:
- Your electric bill will go up. The heater fights the outside air constantly. The colder it gets, the more it runs — expect noticeably higher running costs than in summer.
- Heat retention is everything. On these tubs the cover, the water surface, and the walls are where the heat actually escapes — and an uncovered tub bleeds it fast. So keep the cover on whenever you’re not in it; a floating thermal blanket on the water and rigid foam board underneath help too, but nothing beats the cover.
- Expect slower recovery. After you use it with the cover off, it takes longer to climb back to temperature than it did in July. That’s physics, not a fault — plenty of winter “broken heater” complaints in owner forums turn out to be 30°F air doing its thing.
Scenario 2: Leaving it outside, plugged in but unused
This is where Freeze Shield comes in — the feature on many recent SaluSpa / Lay-Z-Spa models that automatically runs the pump and heater to keep the internals from freezing.
It genuinely helps, but understand its limits:
- It only works within a certain temperature range. Bestway’s guidance kicks the heater in once the outside air drops below about 43°F (6°C), keeping the water in a roughly 43-50°F band. But there’s a hard stop: Bestway says not to use the spa once it’s 14°F (-10°C) outside — if that’s normal where you live, drain and store it rather than leaving it full — and warns that extreme cold can damage it (damage that freeze-ups generally void the warranty on). Check your model’s manual for its exact figures. Not every model has it: the 2017 Coleman 90363 manual has no Freeze Shield and says not to set it up or leave it out below 40°F. How to set up an inflatable hot tub in winter goes model by model.
- It only works while the tub has power and water. This is the one that catches people: a winter power cut silently turns your protected tub into an ice cube tray. If an outage lasts a day or two in freezing weather, the water in the pump and lines can freeze and split the housing.
I’ve written a full breakdown in SaluSpa Freeze Shield, explained — including what it does not cover.
Scenario 3: Hard-freeze climates — winterize it or bring it in
If your winter has sustained stretches below freezing, the honest advice is: don’t gamble a $400-600 tub on a feature designed for margin cases. Either:
- Winterize it: drain it completely (pump lines included — trapped water is what splits pumps), dry it, deflate or leave inflated somewhere sheltered, and store the pump unit indoors.
- Bring the whole thing in — garage or basement — if you have the space and the spot meets the manual’s indoor conditions: a smooth, flat, level floor that can carry the combined weight of the tub, water and users; “plenty of ventilation”, because humidity is a natural side effect indoors; and the same electrical rules as outside — a grounded outlet and no electrical appliances within 5 feet of the tub. Some people run them in a garage all winter, which also slashes the heating cost.
What actually breaks when a tub freezes: the water inside the pump housing and heater lines expands, cracks the plastic, and you find out in spring when it leaks or throws errors. Freeze damage is typically not covered by warranty — manufacturers can tell.
Quick decision table
| Your winter | Best move |
|---|---|
| Rarely freezes (Sun Belt, coastal) | Keep using it; cover + insulation |
| Occasional light frosts | Use it or leave it plugged in if your pump has Freeze Shield; without it (e.g., Coleman 90363), not below 40°F |
| Regular freezes, occasional hard freeze | Only if actively used and monitored; have a plan for outages |
| Sustained hard freezes (northern winters) | Winterize or move it indoors |
FAQ
Below what temperature is it risky? Once ambient stays below freezing for more than a few hours at a time, unpowered water lines are at risk. With power and Freeze Shield, you have more margin — but check your manual’s stated range and don’t push past it.
Does a power cut really ruin it? In freezing weather, it can. If an outage hits, drain the pump unit or bring it inside until power is back.
What does it cost to keep heated all winter? Highly climate-dependent. Plan for it being your most expensive season of ownership — insulation (cover, thermal blanket, foam base) is what brings the number down; see how to insulate an inflatable hot tub.
Made it through a winter with your inflatable tub — or lost a pump to a freeze? I’d like to hear how it went; it makes these guides better.
Jake Weber — Jake Weber is the pen name of Rookie Spa’s editor. I don’t sell spas or chemicals, and I’m not affiliated with any brand. Every guide here starts from the manufacturer’s manual, is cross-checked against the questions and fixes owners report most often, and is written in plain English for first-time owners — with a clear warning whenever something involves electricity or water safety.