Pool closing · Alabama
When to Close Your Pool in Montgomery, AL: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Two dates decide a Montgomery closing: November 4, when the 7-day mean drops back through 61°F and the water goes algae-quiet, and November 11, the model deadline set a safe week ahead of the November 18 first-freeze normal. Everything on this page — live water estimate, window, winterizing sequence — exists to land you between them.
Montgomery closing dates at a glance
| Closing window | November 4 – November 11 |
|---|---|
| Close by (deadline) | November 11 |
| First freeze, 50% probability | November 18 |
| Open by (recommended) | March 3 |
| Opening window | February 24 – March 17 |
| 61°F crossing (7-day mean) | March 17 |
| Swim-season length (80°F+ days) | 181 days |
| NOAA normals station | Montgomery 6sw · 6.7 mi · 225 ft |
Closing is close to optional here — many Montgomery owners trade the cover for shorter pump hours and swim the shoulder seasons. If you do close, the late window above still applies.
Four water checkpoints anchor Montgomery's year in the model: mid-April at about 66°F, mid-June at 81°F, mid-August near the 84°F peak zone, and mid-October easing through 71°F. The dates in the table are where those numbers cross the thresholds that matter.
The 12-step Montgomery winterizing checklist
Sequenced against Montgomery's November 4–November 11 window: chemistry while the pump still runs, blowouts before the equipment drains, cover last. Labels dictate every dose.
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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
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
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
Add a winterizing kit or your usual closing chemicals exactly as their labels direct for your volume, with the pump still circulating so everything distributes before shutdown.
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Lower the water level
Check the cover manufacturer's spec before touching the hose: solid covers typically want water below the skimmer mouth, mesh often barely lower than normal. Full draining is off the table entirely.
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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
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
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
Inflate the pillow to about two-thirds, center it, then bring the cover over and secure it per its design. Under ice, that soft dome is the difference between inward compression and outward wall pressure.
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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.
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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
Every item below sells out somewhere in Alabama every November. 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 closing kit
Closing chemistry in one box, dosed by pool volume.
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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
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 Montgomery compares locally
Two nearby data points to triangulate with: Auburn, 49 miles from Montgomery, models its close at November 3 (about a week earlier); Hoover, 78 miles out, at November 1. Montgomery's own window ends November 11. For the other half of the calendar see when to open in Montgomery, or scan the full year on the season page.
Every number on this page traces to one instrument cluster: Montgomery 6sw, 6.7 miles southeast of Montgomery's center at an elevation near 225 feet. NOAA computed its 1991–2020 normals from roughly three decades of daily readings — long enough that one strange spring in Montgomery County barely moves the dates.
Field notes for Montgomery owners
Cover pumps die in the cold — plan for it
A cover pump left running into a hard freeze can lock in ice and burn out. On freezing forecasts, pull it, let the storm pass, and put it back for the melt. Automatic models with freeze protection earn their price in exactly one forgotten weekend.
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 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.
Don't close a pool people are still using
With Montgomery's long season, the question isn't "is it November?" but "has the water actually cooled?" The window running to November 11 exists because warm-water closings breed spring algae. If swimmers keep showing up through November, let them — patience here is free maintenance.
Montgomery pool closing FAQ
What temperature should water be to close a pool?
Below roughly 65°F, and trending down. Water closed warm keeps feeding algae under the cover for weeks; water closed in the 50s goes dormant almost immediately. Montgomery's cool-down lands near November 4 in the normals, which is why the window opens there.
Can you close a pool too early?
Yes — it's the most common closing mistake. Seal 70°F water under a cover and algae keep growing in the dark all autumn; the spring opening turns green and expensive. In Montgomery, hold off until the cool-down near November 4 before covering.
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 Montgomery, so let the live forecast, not a calendar, tell you when freeze protection starts mattering.
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?
Expect equipment damage first — cracked pump volutes, split filter tanks, ruptured heater exchangers — then plumbing leaks that surface at startup. In Montgomery, normals put the first freeze near November 18; everything after that date is borrowed time for an unwinterized system.
When is the last safe date to close in Montgomery?
Our model's practical deadline is November 11 — set by a week of margin before the November 18 first-freeze normal. 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 4–November 11 window, none of that drama applies.
Email me when Montgomery hits the closing window
Data: NOAA 1991–2020 climate normals via Montgomery 6sw (6.7 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.