Pool closing · Georgia
When to Close Your Pool in Brunswick, GA: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Circle November 25 on the Brunswick calendar. Closing earlier traps warm, algae-friendly water under the cover; closing later gambles the plumbing against the first freeze, which the 1991–2020 normals place near December 25. The window opens November 15 — the live widget below shows how this year is actually tracking against it.
Brunswick closing dates at a glance
| Closing window | November 15 – November 25 |
|---|---|
| Close by (deadline) | November 25 |
| First freeze, 50% probability | December 25 |
| Open by (recommended) | March 1 |
| Opening window | February 22 – March 15 |
| 61°F crossing (7-day mean) | March 15 |
| Swim-season length (80°F+ days) | 160 days |
| NOAA normals station | Brunswick · 2.3 mi · 13 ft |
A classic four-season pool calendar: open early into cold water, close late into cold water, and Brunswick's 160 days of prime swimming sit safely in between.
The same model in water terms: Brunswick's estimated pool temperature runs about 66°F in mid-April, 79°F in mid-June, 82°F in mid-August, and 73°F in mid-October, peaking near 83°F. Those four checkpoints — not any calendar holiday — are what the windows above are protecting.
The 12-step Brunswick winterizing checklist
The order matters more than the date: balanced water first, verified-dry lines before anything else freezes-proofs, and the cover only after everything below it is done. Work the list inside the window above.
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Balance the water a few days ahead
Three or four days before closing, adjust alkalinity and pH into label ranges. Balanced water is gentler on the liner, plaster, and equipment through the long covered months ahead.
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Deep-clean the pool
Skim, brush walls and steps, and vacuum carefully. Any leaves or algae you seal under the cover become spring's chemistry problem, so closing day cleanliness pays twice.
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Service the filter one last time
Clean media goes into storage, dirty media comes out worse: backwash the sand or DE, rinse the cartridges, all per the manual, before anything drains.
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Apply winter chemicals per label
Dose the winter kit while the pump still runs — every product exactly per its label for your volume — so the chemistry is fully mixed before the system goes quiet.
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Lower the water level
Drop the level as your cover manufacturer specifies — typically below the skimmer mouth for solid covers. Never drain a pool fully; groundwater pressure can damage the shell.
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Blow out the lines and plug returns
The blowout is the whole ballgame: drive air through each line until it runs dry, seat the plug against the airflow, move to the next. A dry line cannot burst, full stop.
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Protect the skimmer
Seat a skimmer guard or bottle in the throat — ice that forms there needs a sacrifice, and a two-dollar bottle beats a plumbing repair under the deck.
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Add pool antifreeze where blowouts fall short
If any line can't be verified dry, add pool-grade antifreeze per its label. Use only pool antifreeze — automotive products don't belong in pool plumbing.
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Drain the equipment
Open the drains on everything that holds water and let the pad empty completely. Cartridges and small equipment overwinter far better on a garage shelf than outside.
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Set the air pillow and cover
Pillow first, cover second, tension last. A properly centered pillow turns the winter ice sheet from a wall-pressing ram into a harmless dome.
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Store chemicals properly
Seal opened containers, keep oxidizers and acids separated, and store everything cool, dry, and locked away from kids and pets — exactly as each label describes.
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Remove and store ladders and rails
Pull ladders, rails, and the diving-board hardware; rinse, dry, and store them out of the weather. Anchor sockets get a dab of protectant so spring bolts turn freely.
What to buy before the rush
The November crowd empties shelves in a predictable order. This is the short list worth owning before Brunswick's window opens — nothing exotic, just the stuff everyone needs the same weekend.
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Pool antifreeze
For lines you can't verify dry — pool-grade only, per label.
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Winter closing kit
Closing chemistry in one box, dosed by pool volume.
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Air pillow
Gives ice somewhere to push besides your pool walls.
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Winter cover
Sized to overlap; the cheapest insurance the pool wears all winter.
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Cover pump
Standing water is a cover killer; this is the counter.
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Expansion plugs + skimmer guard
The blowout's finishing move — one per return, one for the skimmer.
How Brunswick compares locally
Brunswick closes in the earliest quarter of Georgia's calendar. Neighbors run close: Jacksonville (57 mi away) models its deadline at December 12 (roughly two weeks later vs Brunswick's November 25), while Savannah (63 mi) shows November 17. The spring mirror of this page is the Brunswick opening guide, and the season overview draws both windows on a single bar.
Every number on this page traces to one instrument cluster: Brunswick, 2.3 miles northwest of Brunswick's center at an elevation near 13 feet. NOAA computed its 1991–2020 normals from roughly three decades of daily readings — long enough that one strange spring in Glynn County barely moves the dates.
Field notes for Brunswick owners
Leaf season vs closing day
If your yard drops serious leaves, the cheap trick is a leaf net over the main cover through the drop, then one bulk removal before snow. Leaves that winter on (or worse, under) the cover steep like tea and hand you stained water and clogged pumps in spring.
Salt cells overwinter indoors
Remove the cell at closing, inspect and clean per the manufacturer, and store it inside with the unions capped. A dummy cell or spacer keeps the plumbing sealed. Cells left in outdoor plumbing through freezes are a common — and completely avoidable — spring casualty.
The mesh-cover spring surprise, prevented in fall
Mesh-covered pools green up early because late-winter sun plus nutrient-carrying meltwater reaches the water. The fall counter-moves: close late and cold, dose the winter kit exactly per label, and plan an early-spring peek under the cover rather than a Memorial Day reveal.
Brunswick pool closing FAQ
What temperature should water be to close a pool?
Cold enough that biology has clocked out — below 65°F and falling, ideally low 60s. The widget above tracks Brunswick's actual water; the normals say the durable cool-down arrives near November 15, and anything inside the window to November 25 closes clean.
Can you close a pool too early?
Yes — it's the most common closing mistake. Seal 70°F water under a cover and algae keep growing in the dark all autumn; the spring opening turns green and expensive. In Brunswick, hold off until the cool-down near November 15 before covering.
Do I need antifreeze in pool lines?
Only where water might remain. If every line is properly blown out and plugged, air is the antifreeze. Lines you can't verify dry — long runs, low spots, water features — get pool-grade antifreeze dosed per its label. With Brunswick's first freeze normal near December 25, don't leave that question open.
How far should I drain my pool for winter?
Less than most people think. Below the skimmer opening is the classic solid-cover target; mesh covers often specify higher water. The cover's own manual wins every argument, and "drain it completely" is never the answer — empty shells pop out of wet ground.
What happens if you don't winterize a pool?
The freeze finds every shortcut. Ice in an unprotected pump or heater cracks castings from the inside; ice in underground lines splits fittings you can't see until spring. Brunswick reaches freeze territory around December 25 — the checklist above is cheaper than any one of those repairs.
When is the last safe date to close in Brunswick?
The model draws the line at November 25 for Brunswick. It isn't arbitrary: the cool-down plus ten days (the freeze normal, December 25, leaves room to spare), and the whole closing sequence needs a working weekend of margin. The one exception that overrides any date — a hard freeze inside the 10-day forecast, which the widget above flags as urgent.
Email me when Brunswick hits the closing window
Data: NOAA 1991–2020 climate normals via Brunswick (2.3 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.