Pool closing · Nevada
When to Close Your Pool in Henderson, NV: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
In Henderson, the closing window runs from November 6 to November 16. Let the water cool out of the algae-growth range before covering — close too warm and you lift the cover onto a green surprise in spring — but finish ahead of the first freeze, which normals place around December 15. The live estimate below shows where Henderson's water sits today.
Henderson closing dates at a glance
| Closing window | November 6 – November 16 |
|---|---|
| Close by (deadline) | November 16 |
| First freeze, 50% probability | December 15 |
| 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) | 180 days |
| NOAA normals station | Las Vegas Mccarran Airport · 8.1 mi · 2131 ft |
Closing is close to optional here — many Henderson 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 Henderson's year in the model: mid-April at about 66°F, mid-June at 86°F, mid-August near the 92°F peak zone, and mid-October easing through 74°F. The dates in the table are where those numbers cross the thresholds that matter.
The 12-step Henderson winterizing checklist
Sequenced against Henderson's November 6–November 16 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
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
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
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
Dose the winter kit while the pump still runs — every product exactly per its label for your volume — so the chemistry is fully mixed before the system goes quiet.
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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
Give the skimmer something cheap to break: a guard bottle or rated plug absorbs the ice expansion that would otherwise split the housing.
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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
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
Pillow first, cover second, tension last. A properly centered pillow turns the winter ice sheet from a wall-pressing ram into a harmless dome.
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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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Note this year's dates
Jot down when Henderson's water actually cooled and when you closed. A two-line note beats memory next November 6 — your own yard runs a few days off any model, including ours.
What to buy before the rush
Every item below sells out somewhere in Nevada 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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Expansion plugs + skimmer guard
Seals blown-out lines and sacrifices itself to skimmer ice.
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Pool antifreeze
For lines you can't verify dry — pool-grade only, per label.
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Winter closing kit
The under-the-cover chemistry, measured for your gallons.
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Air pillow
A soft target for the ice sheet, centered under the cover.
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Winter cover
Measure with overlap; the winter workhorse over everything else.
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Cover pump
Keeps rain and melt off a solid cover all season.
How Henderson compares locally
Statewide context: across the 9 Nevada cities we model, Henderson's November 16 deadline sits in the earliest quarter. Nearby, Paradise (7 mi) closes around November 16 and Enterprise (11 mi) around November 13 — treat gaps under a week as microclimate noise, not strategy. Spring planning restarts at the opening guide; the Henderson pool season page keeps the whole year in one view.
Local means local: Henderson's dates come from Las Vegas Mccarran Airport, the nearest station with complete daily temperature normals — 8.1 miles northwest, about 2131 feet up. Between that station and a Clark County backyard there's always a degree or two of microclimate; the windows are built wide enough to carry it.
Field notes for Henderson owners
Salt cells overwinter indoors
Remove the cell at closing, inspect and clean per the manufacturer, and store it inside with the unions capped. A dummy cell or spacer keeps the plumbing sealed. Cells left in outdoor plumbing through freezes are a common — and completely avoidable — spring casualty.
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.
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.
The case for a shorter off-season
Henderson'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 16 for a reason. Closing late and cold beats closing early and warm in every spring-condition metric that matters.
Henderson 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. Henderson's cool-down lands near November 6 in the normals, which is why the window opens there.
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 Henderson's water cool through the mid-60s°F — around November 6 by our model — then close inside the window that ends November 16.
Do I need antifreeze in pool lines?
It depends entirely on your confidence in the blowout. Lines that blew fully dry need nothing; anything uncertain — low runs, water features, a stubborn cleaner line — gets pool-grade antifreeze at the label's rate per foot. With Henderson's freeze clock starting near December 15, uncertainty is the thing to eliminate.
How far should I drain my pool for winter?
Only to the line your cover manufacturer prints — a few inches below the skimmer for most solid covers, close to operating level for many mesh designs with the skimmer plugged. The water you leave in is structural: it holds the shell against groundwater all winter.
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 Henderson, normals put the first freeze near December 15; everything after that date is borrowed time for an unwinterized system.
When is the last safe date to close in Henderson?
November 16, by our model — the cool-down plus ten days (the freeze normal, December 15, leaves room to spare). Later closes happen, but they happen in gloves. The winterizing steps above take a weekend; leave yourself at least that much runway before Henderson's first freeze-risk stretch.
Email me when Henderson hits the closing window
Data: NOAA 1991–2020 climate normals via Las Vegas Mccarran Airport (8.1 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.