Pool closing · California
When to Close Your Pool in Long Beach, CA: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Plan to close your Long Beach pool by November 29. The local 7-day mean temperature drops out of the algae-risk zone around November 19, and NOAA normals put the first 32°F freeze near January 5 — winterize between those dates and the water goes under the cover cold, clean, and easy to reopen. Below: today's water estimate, the full closing window, and a step-by-step winterizing checklist.
Long Beach closing dates at a glance
| Closing window | November 19 – November 29 |
|---|---|
| Close by (deadline) | November 29 |
| First freeze, 50% probability | January 5 |
| Open by (recommended) | March 16 |
| Opening window | March 9 – March 30 |
| 61°F crossing (7-day mean) | March 30 |
| Swim-season length (80°F+ days) | 89 days |
| NOAA normals station | Long Beach Daugherty Field · 1.6 mi · 31 ft |
A short season cuts both ways: every week opened before March 30 is a real slice of Long Beach's roughly 89-day warm-swim budget.
Put dates aside and follow the water: the Long Beach curve says roughly 62°F by mid-April, 68°F by mid-June, 74°F in mid-August, then back down through 70°F in mid-October. The summer ceiling sits near 74°F, and every window above is just a line drawn on this curve.
The 12-step Long Beach 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
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
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
Winter chemicals go in before shutdown, not after: label-dosed, circulated for a few hours, distributed evenly. A floater dropped on still water protects one corner.
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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
Work line by line: push air until the return spits dry mist, plug it against the flowing air, move on. Skimmer, returns, cleaner line, in whatever order your plumbing prefers — dry pipes are the entire point of closing.
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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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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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Stage the cover pump
Solid covers need drainage all winter: set a cover pump or siphon before the first storm, not after. Standing water strains seams and invites a mid-winter emergency.
What to buy before the rush
A small stack of supplies turns the checklist above into a single-weekend job. Buy before Long Beach's November rush and the whole list ships at leisure instead of sprinting.
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Winter cover
The one purchase every other closing step depends on.
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Cover pump
Keeps rain and melt off a solid cover all season.
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Expansion plugs + skimmer guard
Cheap rubber that stands between ice and your fittings.
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Pool antifreeze
Pool-rated glycol for the lines air couldn't clear.
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Winter closing kit
Season-length winter chemicals in one label-dosed box.
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Air pillow
Centers under the cover so ice pushes inward, not outward.
How Long Beach compares locally
Long Beach closes in the earliest quarter of California's calendar. Neighbors run close: Lakewood (4 mi away) models its deadline at November 29 (the same day vs Long Beach's November 29), while Carson (6 mi) shows November 24. The spring mirror of this page is the Long Beach opening guide, and the season overview draws both windows on a single bar.
Every number on this page traces to one instrument cluster: Long Beach Daugherty Field, 1.6 miles northeast of Long Beach's center at an elevation near 31 feet. NOAA computed its 1991–2020 normals from roughly three decades of daily readings — long enough that one strange spring in Los Angeles County barely moves the dates.
Field notes for Long Beach 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.
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.
Hard-winter homework
Where winter is long — Long Beach banks only about 89 warm-swim days — the closing carries months of load. Bury the effort where it counts: verified-dry lines, fully drained equipment, a skimmer guard, and a cover secured for real wind. A short season forgives a late opening; it never forgives a cracked pump.
Long Beach 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 Long Beach's actual water; the normals say the durable cool-down arrives near November 19, and anything inside the window to November 29 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 Long Beach's water cool through the mid-60s°F — around November 19 by our model — then close inside the window that ends November 29.
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 Long Beach the freeze clock starts around January 5, so settle this during closing, not during the first cold snap.
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. Long Beach reaches freeze territory around January 5 — the checklist above is cheaper than any one of those repairs.
When is the last safe date to close in Long Beach?
Our model's practical deadline is November 29 — set by the cool-down plus ten days (the freeze normal, January 5, 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 19–November 29 window, none of that drama applies.
Email me when Long Beach hits the closing window
Data: NOAA 1991–2020 climate normals via Long Beach Daugherty Field (1.6 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.