Pool closing · Texas
When to Close Your Pool in The Woodlands, TX: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Two dates decide a The Woodlands closing: November 14, when the 7-day mean drops back through 61°F and the water goes algae-quiet, and November 24, the model deadline set a safe week ahead of the December 3 first-freeze normal. Everything on this page — live water estimate, window, winterizing sequence — exists to land you between them.
The Woodlands closing dates at a glance
| Closing window | November 14 – November 24 |
|---|---|
| Close by (deadline) | November 24 |
| First freeze, 50% probability | December 3 |
| Open by (recommended) | February 19 |
| Opening window | February 12 – March 5 |
| 61°F crossing (7-day mean) | March 5 |
| Swim-season length (80°F+ days) | 189 days |
| NOAA normals station | Houston Hooks Memorial Airport · 7.8 mi · 152 ft |
Closing is close to optional here — many The Woodlands owners trade the cover for shorter pump hours and swim the shoulder seasons. If you do close, the late window above still applies.
Put dates aside and follow the water: the The Woodlands curve says roughly 68°F by mid-April, 82°F by mid-June, 85°F in mid-August, then back down through 74°F in mid-October. The summer ceiling sits near 85°F, and every window above is just a line drawn on this curve.
The 12-step The Woodlands 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
Three or four days before closing, adjust alkalinity and pH into label ranges. Balanced water is gentler on the liner, plaster, and equipment through the long covered months ahead.
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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
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
Take the level down only as far as the cover's manual says — usually just below the skimmer for solid covers, higher for many mesh systems. An empty pool is never the goal; shells crack and shift without water's weight.
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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
If any line can't be verified dry, add pool-grade antifreeze per its label. Use only pool antifreeze — automotive products don't belong in pool plumbing.
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Drain the equipment
Open the drains on everything that holds water and let the pad empty completely. Cartridges and small equipment overwinter far better on a garage shelf than outside.
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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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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 The Woodlands's window opens — nothing exotic, just the stuff everyone needs the same weekend.
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Expansion plugs + skimmer guard
Cheap rubber that stands between ice and your fittings.
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Pool antifreeze
Backup for unverifiable lines; label rate per foot of pipe.
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Winter closing kit
The under-the-cover chemistry, measured for your gallons.
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Air pillow
Centers under the cover so ice pushes inward, not outward.
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Winter cover
Measure with overlap; the winter workhorse over everything else.
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Cover pump
Solid covers collect rain all winter; this is the drainage plan.
How The Woodlands compares locally
The Woodlands closes in the earliest quarter of Texas's calendar. Neighbors run close: Conroe (11 mi away) models its deadline at November 25 (1 day later vs The Woodlands's November 24), while Spring (11 mi) shows November 28. The spring mirror of this page is the The Woodlands opening guide, and the season overview draws both windows on a single bar.
The measuring stick here is Houston Hooks Memorial Airport — 7.8 miles to the south, elevation about 152 feet. Its 1991–2020 record is what the model reads for The Woodlands; your backyard in Montgomery County will run a touch warmer or cooler with shade, wind, and pavement, which is exactly the slack the two-week lead absorbs.
Field notes for The Woodlands owners
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 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.
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.
The case for a shorter off-season
The Woodlands's climate leaves water usable well past most owners' patience. If the family still swims in November, don't rush the cover — the model window runs to November 24 for a reason. Closing late and cold beats closing early and warm in every spring-condition metric that matters.
The Woodlands 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 The Woodlands's actual water; the normals say the durable cool-down arrives near November 14, and anything inside the window to November 24 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 The Woodlands's water cool through the mid-60s°F — around November 14 by our model — then close inside the window that ends November 24.
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 The Woodlands sees them from about December 3.
How far should I drain my pool for winter?
As far as your cover manufacturer specifies and no farther — typically a few inches below the skimmer mouth for solid covers, near normal level for many mesh systems with skimmer plugs. Never drain fully: an empty shell can shift or crack under groundwater pressure.
What happens if you don't winterize a pool?
The freeze finds every shortcut. Ice in an unprotected pump or heater cracks castings from the inside; ice in underground lines splits fittings you can't see until spring. The Woodlands reaches freeze territory around December 3 — the checklist above is cheaper than any one of those repairs.
When is the last safe date to close in The Woodlands?
Our model's practical deadline is November 24 — set by the cool-down plus ten days (the freeze normal, December 3, 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 14–November 24 window, none of that drama applies.
Email me when The Woodlands hits the closing window
Data: NOAA 1991–2020 climate normals via Houston Hooks Memorial Airport (7.8 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.