Winterize a drip irrigation system by shutting off its water supply, relieving pressure as the manufacturer directs, draining the lines, and protecting or storing the components that could retain water. A faucet-fed raised-bed kit and a permanently installed irrigation zone do not use the same shutdown procedure. Identify your equipment before disconnecting it.
Quick answer: A timer set to off does not empty the tubing. Trace the water path from the supply through the backflow device, filter, regulator, tubing, and emitters. Each part needs its own freeze-protection check.
Identify the system before starting
Photograph the connections and label zones so you can restore their order in spring. Find the instructions for the timer or controller, filter, regulator, valves, and backflow device. Check whether tubing is removable, fixed above ground, or buried. A low spot can hold water even when an open end appears dry.
Prepare a brush, clean water for removable filter parts, labels, and a dry storage container. Work before freezing weather is expected. If the installation includes a pump, mains-powered controls, or an unfamiliar backflow assembly, ask an irrigation professional to handle the relevant steps. Do not improvise wiring or valve disassembly.
Shut off water and relieve pressure
Close the water supply serving the irrigation system. Follow the controller and valve instructions for releasing trapped pressure before loosening a fitting. Do not disconnect a pressurized assembly or force a stuck plastic thread. An indoor supply valve and an outdoor faucet may have separate winter shutdown requirements.
A removable hose timer may need to come indoors. A permanently installed controller may instead have a rain-off or seasonal setting. Follow the exact model instructions, including any battery directions; do not assume every controller should be unplugged or every valve left in the same position.
Drain tubing without forcing the system
For removable above-ground drip tubing, use the designated end closures or drain points. Lift accessible sections gently toward an open outlet to help water escape from dips, without pulling emitters out or kinking the line. Protect open connections from soil and insects, then close or cover them as the manufacturer specifies.
Do not use an air compressor based on a generic pressure setting. Tubing, valves, emitters, and backflow devices have different limits. Systems requiring an air blowout should be winterized by an irrigation specialist using the appropriate procedure. Insulation slows heat loss but does not make trapped water safe from prolonged freezing.
Store removable components and record their condition
Rinse removable filter screens using their maintenance instructions, let parts dry, and inspect seals and housings for damage. Store components where the specified storage conditions can be maintained. Keep washers and small fittings with their matching assemblies, and note cracked or missing parts before putting them away.
Tubing may be left in place or rolled up depending on its design, exposure, and manufacturer guidance. If it stays outdoors, secure it against damage from tools or foot traffic. Do not bury connections merely to hide them or use an airtight wrap that traps water around an assembly.
Restart gradually in spring
Before reconnecting, check the tubing, end closures, filter housing, and seals. Flush the line through its designated outlets before normal watering, following the system instructions. Restore the filter, pressure regulator, and backflow arrangement correctly, and inspect each zone for leaks or uneven output.
Use our drip-line flushing guide for the cleaning sequence and browse watering and irrigation guides for related maintenance decisions.
Common questions
Can plastic drip tubing stay outdoors? Sometimes, but its suitability depends on the tubing and installation. Draining is essential where freezing is possible, and exposed tubing still needs protection from physical damage. Follow its instructions rather than treating all polyethylene products alike.
Does a faucet cover replace draining? No. A cover does not remove water from the timer, filter, regulator, or line. Follow the faucet and irrigation manufacturers’ winter procedures separately.
Must every emitter be removed? No universal rule applies. Removing parts unnecessarily can damage small connections. Use the maintenance directions for the emitter and tubing system.
Sources and scope
This guide addresses household drip-system shutdown, not a universal compressed-air procedure. See DIG’s winterization instructions for its tubing approach and Rain Bird’s winterization guidance for why unfamiliar permanent systems warrant specialist help. The instructions listed with your equipment take priority.
