Pool closing · Texas
When to Close Your Pool in Garland, TX: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Circle November 9 on the Garland 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 November 21. The window opens October 30 — the live widget below shows how this year is actually tracking against it.
Garland closing dates at a glance
| Closing window | October 30 – November 9 |
|---|---|
| Close by (deadline) | November 9 |
| First freeze, 50% probability | November 21 |
| Open by (recommended) | March 12 |
| Opening window | March 5 – March 26 |
| 61°F crossing (7-day mean) | March 26 |
| Swim-season length (80°F+ days) | 154 days |
| NOAA normals station | Richardson · 8.8 mi · 678 ft |
Garland's 154-day warm season leaves comfortable margins on both ends — the windows above aim you at the cheap-chemistry versions of each transition.
The same model in water terms: Garland's estimated pool temperature runs about 64°F in mid-April, 80°F in mid-June, 86°F in mid-August, and 70°F in mid-October, peaking near 86°F. Those four checkpoints — not any calendar holiday — are what the windows above are protecting.
The 12-step Garland winterizing checklist
Sequenced against Garland's October 30–November 9 window: chemistry while the pump still runs, blowouts before the equipment drains, cover last. Labels dictate every dose.
-
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.
-
Deep-clean the pool
Make the last cleaning the best one of the year: full skim, full brush, careful vacuum. Debris left behind steeps all winter and greets you as April's water problem.
-
Service the filter one last time
Backwash sand or DE, or pull and rinse cartridges, per the manual. A filter stored dirty cakes over winter and starts spring half-clogged.
-
Apply winter chemicals per label
Add a winterizing kit or your usual closing chemicals exactly as their labels direct for your volume, with the pump still circulating so everything distributes before shutdown.
-
Lower the water level
Your cover's manual sets the number — commonly a few inches under the skimmer for solid covers, barely below normal for mesh. Stop there. The remaining water isn't laziness; it's ballast holding the shell in the ground.
-
Blow out the lines and plug returns
Air through every line — skimmer, returns, cleaner — until each blows dry mist, plugging returns while the air still pushes. Nothing else on this list protects as much plumbing per minute.
-
Protect the skimmer
Give the skimmer something cheap to break: a guard bottle or rated plug absorbs the ice expansion that would otherwise split the housing.
-
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.
-
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.
-
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.
-
Stage the cover pump
Solid covers need drainage all winter: set a cover pump or siphon before the first storm, not after. Standing water strains seams and invites a mid-winter emergency.
-
Shut down the heater carefully
Follow the manufacturer's winterizing sequence for your heater — drain it fully and, for gas units, close the supply valve. Heat exchangers are the most expensive freeze casualty on the pad.
What to buy before the rush
Every item below sells out somewhere in Texas every October. Stocking the short list before the rush costs nothing extra and saves the mid-project store run — the chemicals guide explains what each category actually does.
-
Cover pump
Keeps rain and melt off a solid cover all season.
-
Expansion plugs + skimmer guard
The blowout's finishing move — one per return, one for the skimmer.
-
Pool antifreeze
For lines you can't verify dry — pool-grade only, per label.
-
Winter closing kit
The under-the-cover chemistry, measured for your gallons.
-
Air pillow
Gives ice somewhere to push besides your pool walls.
-
Winter cover
Measure with overlap; the winter workhorse over everything else.
How Garland compares locally
Two nearby data points to triangulate with: Rowlett, 5 miles from Garland, models its close at November 7 (2 days earlier); Richardson, 6 miles out, at November 9. Garland's own window ends November 9. For the other half of the calendar see when to open in Garland, or scan the full year on the season page.
The measuring stick here is Richardson — 8.8 miles to the northwest, elevation about 678 feet. Its 1991–2020 record is what the model reads for Garland; your backyard in Dallas County will run a touch warmer or cooler with shade, wind, and pavement, which is exactly the slack the two-week lead absorbs.
Field notes for Garland owners
Cover pumps die in the cold — plan for it
A cover pump left running into a hard freeze can lock in ice and burn out. On freezing forecasts, pull it, let the storm pass, and put it back for the melt. Automatic models with freeze protection earn their price in exactly one forgotten weekend.
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.
The warm spell after you closed
A 78°F week in October doesn't mean reopening. Water under an opaque cover warms far less than air suggests, and a closed, balanced pool tolerates a warm stretch fine. Check the cover pump has somewhere to send rain, enjoy the weather, and leave the plumbing sealed.
Garland pool closing FAQ
What temperature should water be to close a pool?
Close once water holds below about 65°F — the point where algae go mostly dormant — and before hard freezes. In Garland, the 7-day mean drops through the threshold around October 30, so the window between then and November 9 is the sweet spot for a clean, stable close.
Can you close a pool too early?
You can, and warm-water closings are why "we opened to a swamp" stories exist. The fix is patience: let Garland's water cool through the mid-60s°F — around October 30 by our model — then close inside the window that ends November 9.
Do I need antifreeze in pool lines?
It depends entirely on your confidence in the blowout. Lines that blew fully dry need nothing; anything uncertain — low runs, water features, a stubborn cleaner line — gets pool-grade antifreeze at the label's rate per foot. With Garland's freeze clock starting near November 21, uncertainty is the thing to eliminate.
How far should I drain my pool for winter?
As far as your cover manufacturer specifies and no farther — typically a few inches below the skimmer mouth for solid covers, near normal level for many mesh systems with skimmer plugs. Never drain fully: an empty shell can shift or crack under groundwater pressure.
What happens if you don't winterize a pool?
The repair list writes itself in order of cost: heater heat exchanger, pump housing, filter tank, then every fitting the ice reached — discovered one leak at a time in spring. Around Garland the exposure begins near November 21, and each skipped checklist step above is one more candidate for that list.
When is the last safe date to close in Garland?
The model draws the line at November 9 for Garland. It isn't arbitrary: the cool-down plus ten days (the freeze normal, November 21, 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 Garland hits the closing window
Data: NOAA 1991–2020 climate normals via Richardson (8.8 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.