Pool closing · Texas
When to Close Your Pool in Richardson, TX: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Two dates decide a Richardson closing: October 30, when the 7-day mean drops back through 61°F and the water goes algae-quiet, and November 9, 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.
Richardson closing dates at a glance
| Closing window | October 30 – November 9 |
|---|---|
| Close by (deadline) | November 9 |
| First freeze, 50% probability | November 21 |
| Open by (recommended) | March 12 |
| Opening window | March 5 – March 26 |
| 61°F crossing (7-day mean) | March 26 |
| Swim-season length (80°F+ days) | 154 days |
| NOAA normals station | Richardson · 2.6 mi · 678 ft |
A classic four-season pool calendar: open early into cold water, close late into cold water, and Richardson's 154 days of prime swimming sit safely in between.
Four water checkpoints anchor Richardson's year in the model: mid-April at about 64°F, mid-June at 80°F, mid-August near the 86°F peak zone, and mid-October easing through 70°F. The dates in the table are where those numbers cross the thresholds that matter.
The 12-step Richardson 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
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
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
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
Seat a skimmer guard or bottle in the throat — ice that forms there needs a sacrifice, and a two-dollar bottle beats a plumbing repair under the deck.
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Add pool antifreeze where blowouts fall short
Any line you can't prove is dry gets pool-grade antifreeze at the label's rate per foot. Automotive antifreeze is toxic in this context — pool-rated only, always.
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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
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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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.
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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
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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Air pillow
A soft target for the ice sheet, centered under the cover.
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Winter cover
The one purchase every other closing step depends on.
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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.
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Winter closing kit
Closing chemistry in one box, dosed by pool volume.
How Richardson compares locally
Richardson closes in the later half of Texas's calendar. Neighbors run close: Plano (6 mi away) models its deadline at November 9 (the same day vs Richardson's November 9), while Garland (6 mi) shows November 9. The spring mirror of this page is the Richardson opening guide, and the season overview draws both windows on a single bar.
Local means local: Richardson's dates come from Richardson, the nearest station with complete daily temperature normals — 2.6 miles northwest, about 678 feet up. Between that station and a Dallas County backyard there's always a degree or two of microclimate; the windows are built wide enough to carry it.
Field notes for Richardson 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.
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.
The warm spell after you closed
A 78°F week in October doesn't mean reopening. Water under an opaque cover warms far less than air suggests, and a closed, balanced pool tolerates a warm stretch fine. Check the cover pump has somewhere to send rain, enjoy the weather, and leave the plumbing sealed.
Richardson pool closing FAQ
What temperature should water be to close a pool?
Cold enough that biology has clocked out — below 65°F and falling, ideally low 60s. The widget above tracks Richardson's actual water; the normals say the durable cool-down arrives near October 30, and anything inside the window to November 9 closes clean.
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 Richardson's water cool through the mid-60s°F — around October 30 by our model — then close inside the window that ends November 9.
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 Richardson the freeze clock starts around November 21, so settle this during closing, not during the first cold snap.
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 Richardson's first 32°F night arriving near November 21 in the normals, an unwinterized pad is a spring repair bill waiting to be discovered.
When is the last safe date to close in Richardson?
Treat November 9 as the deadline in Richardson. It's derived from the 1991–2020 normals: the cool-down plus ten days (the freeze normal, November 21, leaves room to spare). Weather varies year to year, so watch the 10-day forecast in late November — an early cold snap moves the real deadline, and the widget above flags exactly that.
Email me when Richardson hits the closing window
Data: NOAA 1991–2020 climate normals via Richardson (2.6 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.