You generally should run your pool pump when it freezes, because moving water is much less likely to freeze in pipes and equipment than still water.

Quick Scoop

  • Yes, in most situations you do want the pool pump running continuously when air temps are at or below freezing.
  • The goal is to keep water moving through pipes, filter, and pump so it can’t expand and crack equipment.
  • Modern systems often have a “freeze protection” mode that automatically turns the pump on near 37–38°F (about 3°C).
  • You still need to watch for power outages and extremely low, sustained cold, where full winterization may be safer.

Why running the pump helps in a freeze

  • Moving water doesn’t freeze as easily as standing water, so circulation through pipes and equipment greatly reduces ice formation.
  • If water freezes inside pipes, filter housings, or the pump, it expands and can cause cracks, leaks, or complete equipment failure.
  • Continuous circulation also keeps valves, skimmers, and suction lines from becoming isolated pockets of stagnant, freezing water.

Think of it like a small stream versus a puddle: the puddle ices over first; the running stream usually stays liquid longer in the same cold.

How to run your pool pump safely in freezing weather

  • Run the pump continuously when temps are at or below 32°F (0°C), especially overnight, instead of letting a timer turn it off.
  • If you have automation or freeze protection, set it so the pump turns on around 37–38°F to stay ahead of freezing conditions.
  • Keep all valves and lines open so every pipe has moving water; closing valves can trap water and make those lines more likely to freeze and burst.
  • Maintain proper water level (usually just above the skimmer opening) so the pump doesn’t suck air and lose prime.
  • Clear skimmer baskets and pump strainer of leaves and debris to maintain strong flow, since weak flow makes freezing more likely.
  • Insulate exposed above‑ground plumbing with towels, foam, or purpose‑made pipe insulation to reduce heat loss.

When running the pump might not be enough

There are scenarios where just running the pump isn’t a complete solution:

  • Prolonged deep freeze (many days near or below 0°F / −18°C) can eventually freeze even moving water, especially with wind and exposed plumbing.
  • Power outages are a major risk: if the pump stops and temps are very low, water can quickly freeze in the equipment.
  • In these cases, local pros often recommend draining equipment and lines (winterizing) instead of relying solely on circulation.

If you expect a serious cold snap plus a high chance of power loss, talk to a local pool service about whether to fully winterize rather than just run the pump.

Small forum-style perspective

Owners in colder events often share two common approaches:

  1. Mild to moderate freezes (brief dips below 32°F)
    • Keep the system open and run the pump 24/7 or on freeze-protect automation.
 * Add simple insulation and check equipment a few times a day.
  1. Long, harsh freezes or unreliable power
    • Some still run the pump nonstop, but others choose to shut down and drain the pump, filter, and exposed lines to avoid catastrophic damage if power fails.

This split shows why local climate and power reliability matter as much as the general rule.

Mini FAQ

Can you skip the heater and just run the pump?
Yes—many guides say you do not need to run the pool heater during a freeze; circulation alone usually protects equipment better than heating the whole pool.

How long do you keep running after the freeze?
Keep the pump running until temperatures stay above freezing for at least a few days in a row, so any hidden ice can fully thaw.

Will it spike my electric bill?
Running 24/7 does use more power, but variable‑speed pumps and freeze‑protection modes can reduce energy use while still keeping water moving.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.