Irrigation · November 3, 2026
A few fall steps keep your turf strong through the cold months and ready to green up fast in spring.
A winterization job can look finished and still leave water trapped somewhere in the system. Here's what to watch for.
Valve boxes sit at low points in the system by design, which makes them one of the first places water pools if it wasn't fully removed. If you check a valve box in late fall or winter and find standing water rather than dry components, that's a sign the system wasn't completely cleared.
If a section of yard along a known sprinkler line stays noticeably softer or wetter than the surrounding soil going into winter, that can point to water that's still in the pipe below rather than fully drained out.
A fully winterized system should have no pressure or water movement left in it. Any hissing, gurgling, or pressure you notice at a valve or fitting after winterization was supposedly complete suggests water or air is still trapped somewhere it shouldn't be.
Catching a partial winterization before a hard freeze gives you a chance to have it corrected. Once the freeze hits, whatever water is still in the system is at risk, and by then the fix is a spring repair instead of a fall follow-up.
It usually means the blowout didn't fully clear that section of the system, since valve boxes sit at low points where remaining water tends to collect.
Yes, a visual check of valve boxes and the ground near known lines doesn't require special equipment. If anything looks off, it's worth having it looked at before a freeze.
Much better before. Catching a partial winterization ahead of a freeze allows it to be corrected, rather than dealing with damage that's already happened.