Pool closing · Nevada
When to Close Your Pool in Spring Valley, NV: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
Target November 13 as the practical closing deadline in Spring Valley. Our model of NOAA 1991–2020 normals keeps the 7-day mean above 61°F until November 3; after that, cooling water winds algae down while you work the checklist below. The hard stop is equipment freeze damage — normals put Spring Valley's first 32°F night near December 5.
Spring Valley closing dates at a glance
| Closing window | November 3 – November 13 |
|---|---|
| Close by (deadline) | November 13 |
| First freeze, 50% probability | December 5 |
| Open by (recommended) | March 7 |
| Opening window | February 28 – March 21 |
| 61°F crossing (7-day mean) | March 21 |
| Swim-season length (80°F+ days) | 186 days |
| NOAA normals station | Las Vegas Wfo · 5.5 mi · 2275 ft |
With 186 days of 80°F-plus highs, Spring Valley is keep-it-open country for plenty of owners; the closing dates above matter most if you'd rather not maintain water you won't swim in.
The same model in water terms: Spring Valley's estimated pool temperature runs about 65°F in mid-April, 85°F in mid-June, 92°F in mid-August, and 72°F in mid-October, peaking near 93°F. Those four checkpoints — not any calendar holiday — are what the windows above are protecting.
The 12-step Spring Valley winterizing checklist
A closing is a plumbing project with a chemistry warm-up. Start a few days ahead of your target date, keep every dose per its product label, and don't skip the photographs — spring-you reassembles from them.
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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
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
Clean media goes into storage, dirty media comes out worse: backwash the sand or DE, rinse the cartridges, all per the manual, before anything drains.
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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
Take the level down only as far as the cover's manual says — usually just below the skimmer for solid covers, higher for many mesh systems. An empty pool is never the goal; shells crack and shift without water's weight.
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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
Install a skimmer guard bottle (or a plug rated for your skimmer) so ice that forms there crushes the sacrificial piece instead of cracking the skimmer body.
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Add pool antifreeze where blowouts fall short
If any line can't be verified dry, add pool-grade antifreeze per its label. Use only pool antifreeze — automotive products don't belong in pool plumbing.
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Drain the equipment
Open the drains on everything that holds water and let the pad empty completely. Cartridges and small equipment overwinter far better on a garage shelf than outside.
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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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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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Store chemicals properly
Seal opened containers, keep oxidizers and acids separated, and store everything cool, dry, and locked away from kids and pets — exactly as each label describes.
What to buy before the rush
A small stack of supplies turns the checklist above into a single-weekend job. Buy before Spring Valley's November rush and the whole list ships at leisure instead of sprinting.
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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
For lines you can't verify dry — pool-grade only, per label.
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Winter closing kit
Closing chemistry in one box, dosed by pool volume.
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Air pillow
Gives ice somewhere to push besides your pool walls.
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Winter cover
Measure with overlap; the winter workhorse over everything else.
How Spring Valley compares locally
Statewide context: across the 9 Nevada cities we model, Spring Valley's November 13 deadline sits in the earlier half. Nearby, Enterprise (6 mi) closes around November 13 and Paradise (7 mi) around November 16 — treat gaps under a week as microclimate noise, not strategy. Spring planning restarts at the opening guide; the Spring Valley pool season page keeps the whole year in one view.
Every number on this page traces to one instrument cluster: Las Vegas Wfo, 5.5 miles southeast of Spring Valley's center at an elevation near 2275 feet. NOAA computed its 1991–2020 normals from roughly three decades of daily readings — long enough that one strange spring in Clark County barely moves the dates.
Field notes for Spring Valley owners
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.
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 skimmer is the most breakable part you own
Skimmer bodies crack because water freezes inside the throat with nowhere to push. A sacrificial bottle or spring-loaded guard absorbs that expansion for a few dollars. It's the highest-return item in the entire closing kit relative to what it protects.
Don't close a pool people are still using
With Spring Valley's long season, the question isn't "is it November?" but "has the water actually cooled?" The window running to November 13 exists because warm-water closings breed spring algae. If swimmers keep showing up through November, let them — patience here is free maintenance.
Spring Valley 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 Spring Valley's actual water; the normals say the durable cool-down arrives near November 3, and anything inside the window to November 13 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. Spring Valley's water isn't reliably out of that zone until about November 3 — 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 Spring Valley the freeze clock starts around December 5, 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. Spring Valley reaches freeze territory around December 5 — the checklist above is cheaper than any one of those repairs.
When is the last safe date to close in Spring Valley?
The model draws the line at November 13 for Spring Valley. It isn't arbitrary: the cool-down plus ten days (the freeze normal, December 5, leaves room to spare), and the whole closing sequence needs a working weekend of margin. The one exception that overrides any date — a hard freeze inside the 10-day forecast, which the widget above flags as urgent.
Email me when Spring Valley hits the closing window
Data: NOAA 1991–2020 climate normals via Las Vegas Wfo (5.5 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.