Pool closing · Texas
When to Close Your Pool in Laredo, TX: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Target December 10 as the practical closing deadline in Laredo. Our model of NOAA 1991–2020 normals keeps the 7-day mean above 61°F until December 2; after that, cooling water winds algae down while you work the checklist below. The hard stop is equipment freeze damage — normals put Laredo's first 32°F night near December 17.
Laredo closing dates at a glance
| Closing window | December 2 – December 10 |
|---|---|
| Close by (deadline) | December 10 |
| First freeze, 50% probability | December 17 |
| Open by (recommended) | January 24 |
| Opening window | January 17 – February 7 |
| 61°F crossing (7-day mean) | February 7 |
| Swim-season length (80°F+ days) | 237 days |
| NOAA normals station | Laredo 2 · 0.8 mi · 430 ft |
With 237 days of 80°F-plus highs, Laredo 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 Laredo curve says roughly 76°F by mid-April, 87°F by mid-June, 90°F in mid-August, then back down through 79°F in mid-October. The summer ceiling sits near 90°F, and every window above is just a line drawn on this curve.
The 12-step Laredo 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
Send the filter into winter clean: backwash the sand or DE, rinse and dry the cartridges indoors. Media stored dirty over winter hardens into a spring problem no backwash fixes.
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Apply winter chemicals per label
Run the winter kit through moving water: dose each product per its label with the pump on, give it a few hours to distribute, then start the shutdown. Chemistry added to still water stays where it lands.
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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
Push air through skimmer, return, and cleaner lines until they run dry mist, then seat expansion plugs at each return while air still flows. This is the single most important freeze-protection step.
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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
Every vessel on the pad — pump, filter, heater, chlorinator — gets its drain plugs pulled. Drop all the plugs in the pump basket; that's the one place everyone looks first in spring.
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Set the air pillow and cover
Center an inflated air pillow, then fit the cover and secure it with water bags, cable, or straps as designed. The pillow gives ice a place to push besides your walls.
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Winterize the water features
Waterfalls, slides, and spillover spas hold water in places gravity won't clear — blow those lines separately and plug them, or they'll be the one crack you find in spring.
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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
The December crowd empties shelves in a predictable order. This is the short list worth owning before Laredo's window opens — nothing exotic, just the stuff everyone needs the same weekend.
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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
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.
How Laredo compares locally
Statewide context: across the 68 Texas cities we model, Laredo's December 10 deadline sits in the earliest quarter. Nearby, Edinburg (119 mi) closes around December 26 and McAllen (120 mi) around December 25 — treat gaps under a week as microclimate noise, not strategy. Spring planning restarts at the opening guide; the Laredo pool season page keeps the whole year in one view.
The instrument behind this page is Laredo 2, 0.8 miles northwest of Laredo — 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 Laredo owners
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.
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.
Match the drainage plan to the cover
Solid covers shed nothing — they need a cover pump staged before the first storm and checked after each one. Mesh covers drain themselves but pass silt that settles all winter. Either way, the plan is decided in October, not improvised in January when the cover is an ice sheet.
The case for a shorter off-season
Laredo's climate leaves water usable well past most owners' patience. If the family still swims in December, don't rush the cover — the model window runs to December 10 for a reason. Closing late and cold beats closing early and warm in every spring-condition metric that matters.
Laredo 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 Laredo, the 7-day mean drops through the threshold around December 2, so the window between then and December 10 is the sweet spot for a clean, stable close.
Can you close a pool too early?
Early closing is the mistake the whole model is built to prevent from the other direction. A cover installed over 70°F water is a terrarium: sanitizer decays, algae compound, nobody looks for months. Laredo's water isn't reliably out of that zone until about December 2 — the calendar's first cold weekend doesn't change that.
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 Laredo, so let the live forecast, not a calendar, tell you when freeze protection starts mattering.
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?
Expect equipment damage first — cracked pump volutes, split filter tanks, ruptured heater exchangers — then plumbing leaks that surface at startup. In Laredo, normals put the first freeze near December 17; everything after that date is borrowed time for an unwinterized system.
When is the last safe date to close in Laredo?
December 10, by our model — a week of margin before the December 17 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 Laredo's first freeze-risk stretch.
Email me when Laredo hits the closing window
Data: NOAA 1991–2020 climate normals via Laredo 2 (0.8 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.