Irrigation · December 2025 · 5 min read
Winter irrigation system care prevents freeze damage that can crack pipes, destroy pumps, and ruin expensive drip tape and fittings. Water expands roughly 9% when it freezes, generating enormous pressure that splits even heavy-wall PVC and brass fittings. Thorough winterization before the first hard freeze protects your investment and ensures the system is ready for spring startup.
The most effective method for clearing water from irrigation lines is a compressed air blowout. Connect an air compressor capable of delivering 80-100 CFM at 40-80 PSI to the mainline and blow air through each zone until no water exits the heads or emitters. Work from the zone farthest from the compressor inward.
Never exceed 80 PSI for PVC pipe or 50 PSI for polyethylene drip lines to avoid damaging components.
Drain all water from pumps, pressure tanks, and filter housings. Remove drain plugs and leave them open to allow any residual water to escape. Disconnect suction and discharge lines at the pump. For submersible well pumps, consult your installer about freeze depth and whether winterization is necessary in your area.
Flush all drip lines before draining to remove sediment that can cement in emitters over winter. Open end caps and run water through the system, then drain completely. Clean and inspect all filters, replacing damaged screens or discs. Store removable drip tape coiled in a dry, rodent-free location.
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Check Local WeatherBackflow preventers are among the most freeze-sensitive components in an irrigation system. Drain test ports and isolate the device from supply pressure. In cold climates, remove the backflow preventer entirely and store indoors. Replacement costs of $200-500 make proper winterization a worthwhile investment of time.