Pool closing · Louisiana
When to Close Your Pool in New Orleans, LA: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Plan to close your New Orleans pool by December 2. The local 7-day mean temperature drops out of the algae-risk zone around November 22, 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.
New Orleans closing dates at a glance
| Closing window | November 22 – December 2 |
|---|---|
| Close by (deadline) | December 2 |
| First freeze, 50% probability | January 5 |
| Open by (recommended) | February 15 |
| Opening window | February 8 – March 1 |
| 61°F crossing (7-day mean) | March 1 |
| Swim-season length (80°F+ days) | 171 days |
| NOAA normals station | New Orleans Lakefront Airport · 6.2 mi · 9 ft |
New Orleans's 171-day warm season leaves comfortable margins on both ends — the windows above aim you at the cheap-chemistry versions of each transition.
Put dates aside and follow the water: the New Orleans curve says roughly 69°F by mid-April, 82°F by mid-June, 85°F in mid-August, then back down through 75°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 New Orleans winterizing checklist
Sequenced against New Orleans's November 22–December 2 window: chemistry while the pump still runs, blowouts before the equipment drains, cover last. Labels dictate every dose.
-
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.
-
Deep-clean the pool
Skim, brush walls and steps, and vacuum carefully. Any leaves or algae you seal under the cover become spring's chemistry problem, so closing day cleanliness pays twice.
-
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.
-
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.
-
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.
-
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.
-
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.
-
Add pool antifreeze where blowouts fall short
Antifreeze is the insurance policy for doubtful lines, not a replacement for the blowout: pool-grade product, label dosing, and only where air couldn't finish the job.
-
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.
-
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.
-
Note this year's dates
Jot down when New Orleans's water actually cooled and when you closed. A two-line note beats memory next November 22 — your own yard runs a few days off any model, including ours.
-
Winterize the water features
Waterfalls, slides, and spillover spas hold water in places gravity won't clear — blow those lines separately and plug them, or they'll be the one crack you find in spring.
What to buy before the rush
The November crowd empties shelves in a predictable order. This is the short list worth owning before New Orleans's window opens — nothing exotic, just the stuff everyone needs the same weekend.
-
Air pillow
Centers under the cover so ice pushes inward, not outward.
-
Winter cover
The one purchase every other closing step depends on.
-
Cover pump
Solid covers collect rain all winter; this is the drainage plan.
-
Expansion plugs + skimmer guard
The blowout's finishing move — one per return, one for the skimmer.
-
Pool antifreeze
Backup for unverifiable lines; label rate per foot of pipe.
-
Winter closing kit
The under-the-cover chemistry, measured for your gallons.
How New Orleans compares locally
New Orleans closes in the earliest quarter of Louisiana's calendar. Neighbors run close: Metairie (16 mi away) models its deadline at November 30 (2 days earlier vs New Orleans's December 2), while Slidell (18 mi) shows November 19. The spring mirror of this page is the New Orleans opening guide, and the season overview draws both windows on a single bar.
The measuring stick here is New Orleans Lakefront Airport — 6.2 miles to the west, elevation about 9 feet. Its 1991–2020 record is what the model reads for New Orleans; your backyard in Orleans 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 New Orleans owners
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.
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.
New Orleans 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 New Orleans, the 7-day mean drops through the threshold around November 22, so the window between then and December 2 is the sweet spot for a clean, stable close.
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 New Orleans, hold off until the cool-down near November 22 before covering.
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 New Orleans sees them from about January 5.
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 New Orleans's first 32°F night arriving near January 5 in the normals, an unwinterized pad is a spring repair bill waiting to be discovered.
When is the last safe date to close in New Orleans?
Treat December 2 as the deadline in New Orleans. It's derived from the 1991–2020 normals: the cool-down plus ten days (the freeze normal, January 5, leaves room to spare). Weather varies year to year, so watch the 10-day forecast in late December — an early cold snap moves the real deadline, and the widget above flags exactly that.
Email me when New Orleans hits the closing window
Data: NOAA 1991–2020 climate normals via New Orleans Lakefront Airport (6.2 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.