Pool closing · Texas
When to Close Your Pool in Amarillo, TX: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
In Amarillo, the closing window runs from October 8 to October 18. Let the water cool out of the algae-growth range before covering — close too warm and you lift the cover onto a green surprise in spring — but finish ahead of the first freeze, which normals place around October 29. The live estimate below shows where Amarillo's water sits today.
Amarillo closing dates at a glance
| Closing window | October 8 – October 18 |
|---|---|
| Close by (deadline) | October 18 |
| First freeze, 50% probability | October 29 |
| Open by (recommended) | April 24 |
| Opening window | April 17 – May 8 |
| 61°F crossing (7-day mean) | May 8 |
| Swim-season length (80°F+ days) | 133 days |
| NOAA normals station | Amarillo 7ene · 7.3 mi · 3590 ft |
A classic four-season pool calendar: open early into cold water, close late into cold water, and Amarillo's 133 days of prime swimming sit safely in between.
At roughly 3590 ft, Amarillo 7ene runs cooler than lowland forecasts for the same region — trust these local numbers over metro-wide weather graphics.
Four water checkpoints anchor Amarillo's year in the model: mid-April at about 54°F, mid-June at 73°F, mid-August near the 78°F peak zone, and mid-October easing through 61°F. The dates in the table are where those numbers cross the thresholds that matter.
The 12-step Amarillo winterizing checklist
The order matters more than the date: balanced water first, verified-dry lines before anything else freezes-proofs, and the cover only after everything below it is done. Work the list inside the window above.
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Balance the water a few days ahead
Give the chemistry a head start — balance to label ranges several days out, while circulation can still mix corrections evenly. Closing-day dosing never distributes as well.
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Deep-clean the pool
Leave nothing organic behind: skim the surface, brush every wall and step, vacuum the floor slowly. What goes under the cover dirty comes out worse — winter only ever compounds what it's given.
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Service the filter one last time
One final filter service per the manual — cartridges rinsed and stored dry indoors, sand or DE backwashed. Winter turns trapped gunk into concrete.
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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
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
The blowout is the whole ballgame: drive air through each line until it runs dry, seat the plug against the airflow, move to the next. A dry line cannot burst, full stop.
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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
Open every drain plug on the pump, filter, heater, and chlorinator, and store the plugs in the pump basket so spring reassembly is a one-stop hunt. Move what you can 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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Note this year's dates
Jot down when Amarillo's water actually cooled and when you closed. A two-line note beats memory next October 8 — your own yard runs a few days off any model, including ours.
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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
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.
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Winter cover
Measure with overlap; the winter workhorse over everything else.
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Cover pump
Keeps rain and melt off a solid cover all season.
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Expansion plugs + skimmer guard
Seals blown-out lines and sacrifices itself to skimmer ice.
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Pool antifreeze
For lines you can't verify dry — pool-grade only, per label.
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Winter closing kit
Season-length winter chemicals in one label-dosed box.
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Air pillow
A soft target for the ice sheet, centered under the cover.
How Amarillo compares locally
Two nearby data points to triangulate with: Lubbock, 113 miles from Amarillo, models its close at October 30 (roughly two weeks later); Lawton, 197 miles out, at October 31. Amarillo's own window ends October 18. For the other half of the calendar see when to open in Amarillo, or scan the full year on the season page.
Every number on this page traces to one instrument cluster: Amarillo 7ene, 7.3 miles east of Amarillo's center at an elevation near 3590 feet. NOAA computed its 1991–2020 normals from roughly three decades of daily readings — long enough that one strange spring in Potter County barely moves the dates.
Field notes for Amarillo owners
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 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.
Gas heaters get the manual, not a guess
Every heater brand sequences its winterizing differently — drain plugs, blower considerations, gas supply, control settings. The generic advice (drain fully, close the valve) is right but incomplete; ten minutes with your model's manual protects the most expensive component you'll winterize.
Altitude closing notes
Elevation compresses Amarillo's closing window: at about 3590 ft, radiational cooling can drop a clear night below freezing while afternoons still feel like pool weather. Trust the first-freeze normal (October 29) over the vibe, stage the blowout gear early, and treat any clear-sky cold front in October as your cue.
Amarillo 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 Amarillo, the 7-day mean drops through the threshold around October 8, so the window between then and October 18 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. Amarillo's water doesn't settle below the risk zone until around October 8 — closing much before that trades a few weekends of maintenance for a rough spring.
Do I need antifreeze in pool lines?
Blown-out, plugged lines don't need it; doubtful lines do. Use only antifreeze labeled for pools, at the label's rate per foot of pipe — never automotive antifreeze. In Amarillo the freeze clock starts around October 29, so settle this during closing, not during the first cold snap.
How far should I drain my pool for winter?
Follow the cover's instructions first: solid covers usually want water a few inches below the skimmer; some mesh setups run higher with the skimmer sealed. The hard rule is never empty — hydrostatic pressure can lift or crack an empty pool, a far worse outcome than any freeze.
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 Amarillo's first 32°F night arriving near October 29 in the normals, an unwinterized pad is a spring repair bill waiting to be discovered.
When is the last safe date to close in Amarillo?
October 18, by our model — the cool-down plus ten days (the freeze normal, October 29, leaves room to spare). Later closes happen, but they happen in gloves. The winterizing steps above take a weekend; leave yourself at least that much runway before Amarillo's first freeze-risk stretch.
Email me when Amarillo hits the closing window
Data: NOAA 1991–2020 climate normals via Amarillo 7ene (7.3 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.