Drip faucets when outdoor temperatures drop to 20°F (-7°C) or below to prevent pipes from freezing. This keeps water moving through the lines, reducing the risk of bursts during cold snaps like those common in winter across the U.S.

Why Drip Faucets?

Freezing water expands and can crack pipes, leading to costly repairs, water damage, and mold. A slow drip—about 5-10 drops per minute—maintains flow without wasting much water. Start this precaution if lows are forecasted below freezing for several hours, especially overnight.

Recommended Thresholds

  • Primary trigger : 20°F (-7°C) or lower, as pipes become vulnerable quickly in sustained cold.
  • Conservative start : Around 28-32°F (0°C) if pipes are exposed or in unheated areas like garages.
  • Stop dripping : When temperatures stay consistently above 32°F (0°C).

> "Start dripping faucets when the temperature is 20°F or below."

How to Drip Effectively

  1. Choose faucets farthest from your water meter, often on exterior walls.
  2. Let both hot and cold sides trickle slowly—aim for a steady but minimal stream.
  3. Open cabinet doors under sinks to let indoor heat reach pipes.
  4. Insulate exposed pipes with foam covers for extra protection.

Regional and Forum Insights

In milder climates like Texas (e.g., Frisco lows of 29°F), opinions vary—some say drip preemptively, others skip for brief dips if insulated well. Northern forums urge caution below 25°F due to harsher winds. Recent 2025 guides echo 20°F as standard amid variable winters.

Extra Prevention Tips

  • Maintain indoor heat at 55°F+ minimum.
  • Seal drafts around windows and doors.
  • Know your shut-off valve for emergencies.

TL;DR : Drip at 20°F or below until above freezing; it's a simple safeguard against frozen pipe disasters.

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