How to Care For Your Hot Tub During Extreme Winter Weather

Severe winter weather can put your hot tub at risk for freeze damage, especially if temperatures drop below freezing and circulation stops due to a power outage or equipment issue. The best protection in most situations is to keep water moving, retain heat, and have a plan in place if power is interrupted. Freeze damage happens when water inside plumbing and equipment freezes and expands, which can crack pipes, split fittings, and damage components like pumps and heaters.

Below is a practical, step-by-step guide to help you protect your hot tub before, during, and after severe winter conditions.

Why Hot Tubs Freeze

Hot tubs are most vulnerable to freezing when water flow stops and temperatures remain below freezing long enough for water in the plumbing to ice over. Freeze damage can occur in internal plumbing lines, fittings, valves, the pump housing, filter components, or the heater. Because the equipment area contains multiple points where water can remain trapped, a partially drained spa can sometimes be at higher risk than a full one if water is left sitting in lines.

Before the Storm: Essential Hot Tub Prep Steps

When it comes to protecting your hot tub during any type of severe weather, preparation is key. While time may not always be on your side, it's crucial to prep your hot tub as much as possible to prevent major damage. Here are some key steps to take before a winter storm hits your area:

1. Secure and insulate the cover

Your hot tub cover is the primary barrier that holds heat in. Confirm that it fits tightly, closes completely, and is secured with straps or locks so strong winds don’t lift it. Avoid opening the cover during cold snaps, since heat loss can be rapid.

If snowfall is expected, plan to remove heavy snow buildup periodically using a soft broom so the cover does not become waterlogged or overly weighed down.

2. Test and balance your water

Cold weather is not a reason to ignore water chemistry. In fact, a well-maintained spa is easier to manage during storms because you will spend less time outdoors making adjustments. Before severe weather arrives:

• Test your water and balance pH, alkalinity, and sanitizer.
• Make sure you have enough sanitizer available for the week.
• Clean the filter so circulation remains strong and consistent.

3. Confirm circulation settings and open all jets

If your hot tub allows you to isolate different jet banks, open them so water circulates through all plumbing lines. Good circulation is one of the most effective defenses against freezing because moving water is less likely to ice over.

4. Set a temperature alert

If your area is prone to sudden temperature drops, set weather alerts or temperature notifications on your phone. This can help you take action early by confirming the hot tub is heated and circulating before the coldest period begins.

What To Do During Freezing Temps

1. Keep the hot tub running

If you are able to maintain power and the spa is operating normally, keep it running. Many hot tubs are designed to function in winter conditions as long as the water is heated and the pump is circulating on its normal schedule.

In extreme cold, some owners choose to run the circulation pump for longer periods to reduce the chance of water freezing in lines. If your spa has a freeze protection mode, confirm it is enabled and functioning properly. Many systems will automatically run the pump when outside temperatures approach freezing.

2. Keep the cover closed

Avoid opening the hot tub unnecessarily during freezing conditions. Every time the cover is opened, you release stored heat and increase the speed at which the water cools. Keeping the cover sealed helps the hot tub maintain temperature and buys time if weather worsens or the power goes out.

What To Do if the Power Goes Out

Power outages are the biggest risk factor during severe winter storms because circulation can stop. If you suspect outages are likely, the goal is to retain as much heat as possible and prevent freezing long enough for power to return.

1. Increase water temperature ahead of the storm

If cold weather and outages are expected, raising the temperature slightly in advance can help the water hold heat longer. A well-insulated hot tub with a tightly sealed cover can retain heat for a period of time, often long enough to prevent freezing during shorter outages.

2. Keep the cover sealed and secured

During an outage, keep the cover closed. Avoid checking the water frequently. Each time the cover is lifted, heat escapes and reduces your margin of safety.

3. Consider safe, temporary cabinet warming only if appropriate

Some guidance recommends adding gentle heat to the equipment compartment during an outage (for example, certain low-wattage heat sources) to slow freezing in the plumbing and equipment area. If you are not experienced with electrical safety in wet environments, this is not a recommended DIY step. Improper use of heaters, extension cords, or unprotected electrical devices can create serious hazards. When in doubt, contact a qualified service professional.

Dealing with a Frozen Hot Tub

If you notice ice forming on the surface or suspect water in the plumbing has begun to freeze, take steps to avoid causing additional equipment damage.

1. Turn off power if the system is not circulating

If pumps are unable to move water due to ice, continued operation can damage equipment. Shut off power at the breaker to prevent further strain.

2. Begin controlled thawing

Controlled thawing can include carefully adding warm water to raise overall temperature and using safe, monitored heat in the cabinet area to help thaw plumbing. Avoid aggressive methods such as open flames or high-heat tools applied too close to plumbing components, wiring, or insulation.

3. Inspect as the system warms

As the hot tub thaws, check for signs of equipment damage such as cracks in the pump housing, broken unions, split fittings, or leaking around the heater. Some condensation is normal during thawing, but steady water flow from the cabinet can indicate freeze damage.

If you suspect damage, stop and contact a hot tub service technician to prevent worsening the issue.

When winterizing (draining) is the better choice

In many climates, you can safely run a hot tub through winter as long as power is reliable and the spa is maintained. However, winterizing can be the safer choice if:

• You expect prolonged power outages,
• You will be away and unable to monitor conditions,
• The hot tub has existing circulation or heating issues,
• Or temperatures are expected to remain well below freezing for an extended period.

Proper winterizing includes draining the tub, clearing water from plumbing lines, and removing water from equipment components where it can remain trapped. This often involves using a wet/dry vacuum to pull water from jets, suction fittings, and the filter cavity, as well as opening drain plugs and loosening unions to release trapped water. Some winterizing procedures also use spa-specific antifreeze in limited areas to protect against residual moisture.

Because incomplete winterizing can still leave water trapped in critical components, many owners choose professional winterization if severe cold and outages are a concern.

Severe Winter Weather Checklist

Before the storm hits:

• Secure the cover and fasten straps/locks.
• Remove heavy snow buildup when needed.
• Test and balance water chemistry; ensure sanitizer supply.
• Clean filters and confirm strong circulation.
• Open all jets so water flows through all plumbing.
• Set temperature and storm alerts.

During freezing weather:

• Keep the spa running and circulating.
• Keep the cover closed as much as possible.
• Confirm freeze protection mode is enabled if available.

If the power goes out:

• Keep the cover sealed and secured.
• Avoid opening the tub to “check” it.
• If you are unsure about safe warming methods, contact a professional.

If freezing begins:

• Shut off power at the breaker if circulation stops.
• Thaw carefully and inspect for leaks or cracks.
• Call a service technician if damage is suspected.

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Keeping yourself safe during a severe winter storm is the top priority. When the storm passes, stop by your local Leslie’s for a free AccuBlue® water test and expert guidance to get your hot tub back on track fast. Need hands-on help? Schedule an at-home service visit and let our team check your equipment, restore circulation, and make sure everything’s running safely—so you can get back to relaxing, not troubleshooting.