Pool closing · Louisiana
When to Close Your Pool in Mandeville, LA: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Two dates decide a Mandeville closing: November 5, 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.
Mandeville closing dates at a glance
| Closing window | November 5 – November 11 |
|---|---|
| Close by (deadline) | November 11 |
| First freeze, 50% probability | November 18 |
| Open by (recommended) | March 4 |
| Opening window | February 25 – March 18 |
| 61°F crossing (7-day mean) | March 18 |
| Swim-season length (80°F+ days) | 171 days |
| NOAA normals station | Covington 4 NNW · 10.6 mi · 40 ft |
A classic four-season pool calendar: open early into cold water, close late into cold water, and Mandeville's 171 days of prime swimming sit safely in between.
Four water checkpoints anchor Mandeville's year in the model: mid-April at about 65°F, mid-June at 78°F, mid-August near the 81°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 Mandeville winterizing checklist
Sequenced against Mandeville's November 5–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
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
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
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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Note this year's dates
Jot down when Mandeville's water actually cooled and when you closed. A two-line note beats memory next November 5 — your own yard runs a few days off any model, including ours.
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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 Mandeville's window opens — nothing exotic, just the stuff everyone needs the same weekend.
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Cover pump
Solid covers collect rain all winter; this is the drainage plan.
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Expansion plugs + skimmer guard
Seals blown-out lines and sacrifices itself to skimmer ice.
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Pool antifreeze
Backup for unverifiable lines; label rate per foot of pipe.
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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.
How Mandeville compares locally
Two nearby data points to triangulate with: Slidell, 19 miles from Mandeville, models its close at November 19 (about a week later); New Orleans, 23 miles out, at December 2. Mandeville's own window ends November 11. For the other half of the calendar see when to open in Mandeville, or scan the full year on the season page.
The instrument behind this page is Covington 4 NNW, 10.6 miles north of Mandeville — the closest station publishing complete 1991–2020 daily temperature normals. Thirty years of its readings set every date above; your own yard adds or subtracts a degree with shade, wind, and pavement, which is what the window's width is for.
Field notes for Mandeville 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.
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.
Leaf season vs closing day
If your yard drops serious leaves, the cheap trick is a leaf net over the main cover through the drop, then one bulk removal before snow. Leaves that winter on (or worse, under) the cover steep like tea and hand you stained water and clogged pumps in spring.
Mandeville 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 Mandeville's actual water; the normals say the durable cool-down arrives near November 5, and anything inside the window to November 11 closes clean.
Can you close a pool too early?
Early closing is the mistake the whole model is built to prevent from the other direction. A cover installed over 70°F water is a terrarium: sanitizer decays, algae compound, nobody looks for months. Mandeville's water isn't reliably out of that zone until about November 5 — the calendar's first cold weekend doesn't change that.
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 Mandeville the freeze clock starts around November 18, so settle this during closing, not during the first cold snap.
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?
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. Mandeville reaches freeze territory around November 18 — the checklist above is cheaper than any one of those repairs.
When is the last safe date to close in Mandeville?
Treat November 11 as the deadline in Mandeville. It's derived from the 1991–2020 normals: a week of margin before the November 18 first-freeze normal. 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 Mandeville hits the closing window
Data: NOAA 1991–2020 climate normals via Covington 4 NNW (10.6 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.