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When to Winterize Commercial Irrigation in New Jersey

The short answer for Monmouth County: late October to mid-November. Here's why, and what a proper blowout includes.

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Book commercial winterizations for late October through mid-November. That's after most properties stop needing water and before a sustained hard freeze. Western Monmouth sites (Freehold, Manalapan, Howell) often freeze a little earlier than shore towns, so schedule them first.

What's at risk

  • Backflow devices — the most exposed and most expensive part; water left inside can crack the body
  • Valves and fittings — trapped water expands and splits plastic
  • Heads and lateral lines — especially in low spots

What a proper commercial blowout includes

  1. Main shut off; drains opened
  2. Each zone cleared with a compressor sized for commercial pipe
  3. Air pressure regulated to protect heads and fittings
  4. Backflow drained and valves left half-open
  5. Controller set to off or rain mode
  6. Visit logged with any spring repairs noted

Don't wait for the first frost

Once frost hits the forecast, every contractor's schedule fills. Contract customers are scheduled automatically. Book winterization →

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