Pool closing · Texas
When to Close Your Pool in Arlington, TX: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Two dates decide a Arlington closing: November 2, when the 7-day mean drops back through 61°F and the water goes algae-quiet, and November 12, the model deadline set a safe week ahead of the November 21 first-freeze normal. Everything on this page — live water estimate, window, winterizing sequence — exists to land you between them.
Arlington closing dates at a glance
| Closing window | November 2 – November 12 |
|---|---|
| Close by (deadline) | November 12 |
| First freeze, 50% probability | November 21 |
| Open by (recommended) | March 10 |
| Opening window | March 3 – March 24 |
| 61°F crossing (7-day mean) | March 24 |
| Swim-season length (80°F+ days) | 166 days |
| NOAA normals station | Arlington Municipal Airport · 3.1 mi · 630 ft |
A classic four-season pool calendar: open early into cold water, close late into cold water, and Arlington's 166 days of prime swimming sit safely in between.
Put dates aside and follow the water: the Arlington curve says roughly 65°F by mid-April, 81°F by mid-June, 86°F in mid-August, then back down through 71°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 Arlington 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
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
Brush, skim, and vacuum like company's coming. A pool that goes under the cover spotless comes out needing a rinse; one that goes under dirty comes out needing a project.
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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
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
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.
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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.
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Protect the skimmer
The skimmer throat is where trapped water has no escape — park a guard bottle or rated plug in it and let ice crush the cheap part.
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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
Float a centered air pillow, then land the cover and secure it the way its design intends — bags, cable, or straps. Ice sheets need somewhere to collapse inward, and the pillow is that somewhere.
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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 Arlington's window opens — nothing exotic, just the stuff everyone needs the same weekend.
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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.
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Winter cover
Sized to overlap; the cheapest insurance the pool wears all winter.
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Cover pump
Keeps rain and melt off a solid cover all season.
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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
Backup for unverifiable lines; label rate per foot of pipe.
How Arlington compares locally
Arlington closes in the later half of Texas's calendar. Neighbors run close: Grand Prairie (6 mi away) models its deadline at November 6 (about a week earlier vs Arlington's November 12), while Mansfield (9 mi) shows November 12. The spring mirror of this page is the Arlington opening guide, and the season overview draws both windows on a single bar.
Local means local: Arlington's dates come from Arlington Municipal Airport, the nearest station with complete daily temperature normals — 3.1 miles southeast, about 630 feet up. Between that station and a Tarrant County backyard there's always a degree or two of microclimate; the windows are built wide enough to carry it.
Field notes for Arlington owners
Blowout first, antifreeze second
Air is the only guaranteed freeze protection: a line that's verifiably dry cannot burst. Antifreeze (pool-grade, per label) is the fallback for lines you can't confirm — long runs, low spots, water-feature plumbing. Doing antifreeze instead of a blowout, rather than in addition, is how most cracked returns happen.
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.
What comes indoors
Cartridges, the cover pump when idle, chemical containers, and anything with a small motor overwinter better in the garage. Cold cycling is hard on plastics and seals; shelf space is cheaper than replacements. Label a single bin now and spring assembly becomes a scavenger hunt with a map.
Arlington 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 Arlington, the 7-day mean drops through the threshold around November 2, so the window between then and November 12 is the sweet spot for a clean, stable close.
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. Arlington's water doesn't settle below the risk zone until around November 2 — closing much before that trades a few weekends of maintenance for a rough spring.
Do I need antifreeze in pool lines?
Treat antifreeze as a backup, not a substitute: the real protection is air in dry lines. Where a full blowout isn't possible, pool-grade antifreeze per label is cheap insurance against a cracked pipe — worth it anywhere freezes are routine, and Arlington sees them from about November 21.
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 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 Arlington 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 Arlington?
Our model's practical deadline is November 12 — set by the cool-down plus ten days (the freeze normal, November 21, 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 2–November 12 window, none of that drama applies.
Email me when Arlington hits the closing window
Data: NOAA 1991–2020 climate normals via Arlington Municipal Airport (3.1 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.