Pool closing · Texas
When to Close Your Pool in Georgetown, TX: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Target November 16 as the practical closing deadline in Georgetown. Our model of NOAA 1991–2020 normals keeps the 7-day mean above 61°F until November 6; after that, cooling water winds algae down while you work the checklist below. The hard stop is equipment freeze damage — normals put Georgetown's first 32°F night near November 24.
Georgetown closing dates at a glance
| Closing window | November 6 – November 16 |
|---|---|
| Close by (deadline) | November 16 |
| First freeze, 50% probability | November 24 |
| Open by (recommended) | March 9 |
| Opening window | March 2 – March 23 |
| 61°F crossing (7-day mean) | March 23 |
| Swim-season length (80°F+ days) | 181 days |
| NOAA normals station | Georgetown Lake · 1.6 mi · 874 ft |
With 181 days of 80°F-plus highs, Georgetown is keep-it-open country for plenty of owners; the closing dates above matter most if you'd rather not maintain water you won't swim in.
Put dates aside and follow the water: the Georgetown curve says roughly 65°F by mid-April, 80°F by mid-June, 85°F in mid-August, then back down through 72°F in mid-October. The summer ceiling sits near 85°F, and every window above is just a line drawn on this curve.
The 12-step Georgetown winterizing checklist
Sequenced against Georgetown's November 6–November 16 window: chemistry while the pump still runs, blowouts before the equipment drains, cover last. Labels dictate every dose.
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Balance the water a few days ahead
Start midweek for a weekend close: bring alkalinity and pH into their label ranges and let the water settle. What you seal under the cover is what the pool soaks in until spring.
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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.
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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.
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Apply winter chemicals per label
Winter chemicals go in before shutdown, not after: label-dosed, circulated for a few hours, distributed evenly. A floater dropped on still water protects one corner.
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Lower the water level
Check the cover manufacturer's spec before touching the hose: solid covers typically want water below the skimmer mouth, mesh often barely lower than normal. Full draining is off the table entirely.
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Blow out the lines and plug returns
Work line by line: push air until the return spits dry mist, plug it against the flowing air, move on. Skimmer, returns, cleaner line, in whatever order your plumbing prefers — dry pipes are the entire point of closing.
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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.
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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
Nothing on the pad should hold water overnight: pull the drain plugs from pump, filter, heater, and feeder, stash them all in the pump basket, and carry the portable pieces indoors.
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Set the air pillow and cover
Inflate the pillow to about two-thirds, center it, then bring the cover over and secure it per its design. Under ice, that soft dome is the difference between inward compression and outward wall pressure.
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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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Note this year's dates
Jot down when Georgetown's water actually cooled and when you closed. A two-line note beats memory next November 6 — your own yard runs a few days off any model, including ours.
What to buy before the rush
The November crowd empties shelves in a predictable order. This is the short list worth owning before Georgetown's window opens — nothing exotic, just the stuff everyone needs the same weekend.
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Winter closing kit
Closing chemistry in one box, dosed by pool volume.
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Air pillow
Centers under the cover so ice pushes inward, not outward.
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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
Cheap rubber that stands between ice and your fittings.
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Pool antifreeze
For lines you can't verify dry — pool-grade only, per label.
How Georgetown compares locally
Two nearby data points to triangulate with: Round Rock, 10 miles from Georgetown, models its close at November 13 (3 days earlier); Leander, 12 miles out, at November 16. Georgetown's own window ends November 16. For the other half of the calendar see when to open in Georgetown, or scan the full year on the season page.
The measuring stick here is Georgetown Lake — 1.6 miles to the northwest, elevation about 874 feet. Its 1991–2020 record is what the model reads for Georgetown; your backyard in Williamson 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 Georgetown owners
The fifteen-minute monthly walk-around
Once a month all winter: pump or siphon standing water off solid covers, re-tension straps or top up water bags, confirm the level hasn't dropped enough to strand the cover, and glance at the pad for critter nests. Every major cover failure starts as a skipped walk-around.
Cold water is the whole point
A pool closed at 55°F barely changes all winter: algae are dormant, chemicals hold, and spring opens with a light dusting instead of a bloom. A pool closed at 72°F runs its own quiet ecosystem under the cover for a month. The date matters less than the water temperature it represents.
The skimmer is the most breakable part you own
Skimmer bodies crack because water freezes inside the throat with nowhere to push. A sacrificial bottle or spring-loaded guard absorbs that expansion for a few dollars. It's the highest-return item in the entire closing kit relative to what it protects.
Don't close a pool people are still using
With Georgetown's long season, the question isn't "is it November?" but "has the water actually cooled?" The window running to November 16 exists because warm-water closings breed spring algae. If swimmers keep showing up through November, let them — patience here is free maintenance.
Georgetown pool closing FAQ
What temperature should water be to close a pool?
The practical target is water in the low 60s°F or below at closing day. Our Georgetown model has the sustained cool-down starting November 6; closing between then and November 16 means chemistry stays put and the spring reveal is a mild one.
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 Georgetown's water cool through the mid-60s°F — around November 6 by our model — then close inside the window that ends November 16.
Do I need antifreeze in pool lines?
Only for lines you can't verify dry — a proper blowout makes antifreeze unnecessary. Where doubt remains, use pool-grade product at its label rate, never automotive. No freeze-probability normal is published near Georgetown, so let the live forecast, not a calendar, tell you when freeze protection starts mattering.
How far should I drain my pool for winter?
Only to the line your cover manufacturer prints — a few inches below the skimmer for most solid covers, close to operating level for many mesh designs with the skimmer plugged. The water you leave in is structural: it holds the shell against groundwater all winter.
What happens if you don't winterize a pool?
Expect equipment damage first — cracked pump volutes, split filter tanks, ruptured heater exchangers — then plumbing leaks that surface at startup. In Georgetown, normals put the first freeze near November 24; everything after that date is borrowed time for an unwinterized system.
When is the last safe date to close in Georgetown?
Our model's practical deadline is November 16 — set by the cool-down plus ten days (the freeze normal, November 24, leaves room to spare). Push much past it and you're winterizing in freeze-warning weather, rushing the blowout, and hoping the cover goes on before the first hard night. Inside the November 6–November 16 window, none of that drama applies.
Email me when Georgetown hits the closing window
Data: NOAA 1991–2020 climate normals via Georgetown Lake (1.6 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.