Closing a Gunite Pool for a Rhode Island Winter
Covers, chemistry and the cold. How we put a gunite pool to bed for a Rhode Island winter so it opens clean in May.
A gunite pool with a pebble finish is built for this climate. It does not care about the cold. What it cares about is being closed carelessly: water left unbalanced for five months, lines not fully cleared before a hard freeze, a cover that sags into the water and ferments a season of leaves. Nearly every ugly spring opening I have seen traces back to a hurried October. Here is how we close the pools we build and service, and why each step is there.
Timing
We close when the water is consistently below about sixty degrees, which on Aquidneck Island is usually mid to late October, sometimes into November in a warm fall. Closing early, in September, feels tidy but it leaves warm water under a cover for weeks, and warm water is where algae gets its start. Closing late risks the first freeze catching water in the plumbing. The water temperature, not the calendar, decides.
Balance first
The most important part of a closing happens a week before anyone touches a cover. We test the water properly, with a drop kit rather than strips, and bring it into balance for cold water: pH, alkalinity, calcium hardness and the saturation index all in range, phosphates low, and the chlorine or salt system residual where it should be. Water that sits for five months out of balance will either etch the finish or leave scale on it, and neither comes off easily. A pebble finish is forgiving, but it is not immune.
For salt pools we clean and inspect the cell, then remove it and store it indoors with the drain plugs. A salt cell left in an unheated line over a Rhode Island winter is a cracked salt cell.
Clearing the lines
The pool itself can hold water all winter. The plumbing cannot. We lower the water just enough to work, blow every line out with a proper blower until it runs clear, plug the returns and the skimmer, and add non-toxic pool antifreeze to any line that cannot be fully cleared. The pump, filter, heater and any automation get drained, their plugs removed and stored in the pump basket where they will be found in spring, and the heater is winterized to the manufacturer's instructions. Spa jets and spillways get the same attention; they are the lines people forget.
On a pool with a tile waterline and a solid cover we drop the water below the tile. On a pool with a mesh safety cover we often keep the level higher, because a mesh cover is designed to let rain and melt through and the pool will fill itself over the winter anyway. Which cover you have changes the closing, which is one reason we like to be the ones who installed it.
The cover
A safety cover, mesh or solid, anchored into the deck, is what we recommend and install on nearly every pool. It holds a child or a dog, it sheds snow, and it keeps the pool clean enough that opening is a morning's work rather than a week's. A floating tarp and water bags is a different animal: it collects a pond of black water on top, it blows off in a nor'easter, and it is not a safety barrier. If a pool we service still has one, that is the first conversation we have.
Good cover installation is mostly in the details: straps tensioned evenly, anchors set true in the stone so the cover does not chafe the coping, and a cover pump on a solid cover so it never carries a standing load of water.
A pool closed well is a pool you forget about until May. That is the whole point.
What we watch all winter
Closing is not the end of it. Through the winter we check the pools on our service list after big storms: cover tension, water level, anything that has blown onto the cover, ice. Snow sitting on a mesh cover is fine. Water on a solid cover is not. A pool that drops its level for no reason in January is telling you something about a leak, and we would rather know in January than in June. For clients who are away for the season, this is the part of the service that matters most.
Spring, briefly
Opening is the closing in reverse, with the chemistry done carefully again before anyone swims. A pool closed in balance with clear lines and a tight cover opens blue. One closed in a hurry opens green, and the two weeks of chemicals and labor it takes to fix that cost more than the closing would have. If you have a gunite pool and you would like it closed, opened and looked after by the people who understand how it was built, our pool service division does exactly that for Newport, Middletown, Portsmouth, Jamestown, Little Compton and Tiverton.
Winter covers, closings and openings, startup chemistry and season-long care are all part of what we offer. See the pools page for the full picture of what we design, build and service.
O'Connor Design Build is a Certified Genesis Pool Builder and the recipient of the 2026 Preservation Society of Newport County Laurel Award for Horticulture.
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