Pool closing · Texas
When to Close Your Pool in College Station, TX: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Target November 23 as the practical closing deadline in College Station. Our model of NOAA 1991–2020 normals keeps the 7-day mean above 61°F until November 13; after that, cooling water winds algae down while you work the checklist below. The hard stop is equipment freeze damage — normals put College Station's first 32°F night near November 30.
College Station closing dates at a glance
| Closing window | November 13 – November 23 |
|---|---|
| Close by (deadline) | November 23 |
| First freeze, 50% probability | November 30 |
| Open by (recommended) | February 26 |
| Opening window | February 19 – March 12 |
| 61°F crossing (7-day mean) | March 12 |
| Swim-season length (80°F+ days) | 185 days |
| NOAA normals station | College Station · 4.1 mi · 305 ft |
With 185 days of 80°F-plus highs, College Station 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 College Station curve says roughly 67°F by mid-April, 82°F by mid-June, 86°F in mid-August, then back down through 74°F in mid-October. The summer ceiling sits near 86°F, and every window above is just a line drawn on this curve.
The 12-step College Station winterizing checklist
A closing is a plumbing project with a chemistry warm-up. Start a few days ahead of your target date, keep every dose per its product label, and don't skip the photographs — spring-you reassembles from them.
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Balance the water a few days ahead
Do the chemistry midweek, close on the weekend: alkalinity and pH into label ranges with days of circulation left to spread them. Winter locks in whatever state the water holds on closing day.
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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
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
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
Doubt is the criterion: any run you can't confirm dry gets pool-grade antifreeze at the label's per-foot rate. The automotive jug from the garage is for cars — it has no business 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
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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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.
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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.
What to buy before the rush
The November crowd empties shelves in a predictable order. This is the short list worth owning before College Station's window opens — nothing exotic, just the stuff everyone needs the same weekend.
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Winter cover
Sized to overlap; the cheapest insurance the pool wears all winter.
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Cover pump
Solid covers collect rain all winter; this is the drainage plan.
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Expansion plugs + skimmer guard
The blowout's finishing move — one per return, one for the skimmer.
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Pool antifreeze
Pool-rated glycol for the lines air couldn't clear.
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Winter closing kit
Season-length winter chemicals in one label-dosed box.
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Air pillow
Centers under the cover so ice pushes inward, not outward.
How College Station compares locally
Statewide context: across the 68 Texas cities we model, College Station's November 23 deadline sits in the earlier half. Nearby, Bryan (7 mi) closes around November 23 and Conroe (52 mi) around November 25 — treat gaps under a week as microclimate noise, not strategy. Spring planning restarts at the opening guide; the College Station pool season page keeps the whole year in one view.
The instrument behind this page is College Station, 4.1 miles west of College Station — the closest station publishing complete 1991–2020 daily temperature normals. Thirty years of its readings set every date above; your own yard adds or subtracts a degree with shade, wind, and pavement, which is what the window's width is for.
Field notes for College Station owners
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.
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 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.
Don't close a pool people are still using
With College Station's long season, the question isn't "is it November?" but "has the water actually cooled?" The window running to November 23 exists because warm-water closings breed spring algae. If swimmers keep showing up through November, let them — patience here is free maintenance.
College Station 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 College Station model has the sustained cool-down starting November 13; closing between then and November 23 means chemistry stays put and the spring reveal is a mild one.
Can you close a pool too early?
Absolutely. A pool closed warm is an algae incubator: no circulation, fading sanitizer, and weeks of growth-friendly temperatures. College Station's water doesn't settle below the risk zone until around November 13 — closing much before that trades a few weekends of maintenance for a rough spring.
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 College Station's freeze clock starting near November 30, uncertainty is the thing to eliminate.
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?
In a freeze climate, physics wins: water expands about 9% when it freezes, cracking pump housings, filter tanks, heat exchangers, and pipes. With College Station's first 32°F night arriving near November 30 in the normals, an unwinterized pad is a spring repair bill waiting to be discovered.
When is the last safe date to close in College Station?
November 23, by our model — a week of margin before the November 30 first-freeze normal. Later closes happen, but they happen in gloves. The winterizing steps above take a weekend; leave yourself at least that much runway before College Station's first freeze-risk stretch.
Email me when College Station hits the closing window
Data: NOAA 1991–2020 climate normals via College Station (4.1 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.