Pool closing · Maryland
When to Close Your Pool in Salisbury, MD: Deadline, Window & Checklist
Last updated: July 15, 2026 · Model window year: 2026 · dates · checklist · FAQ
In Salisbury, the closing window runs from October 14 to October 24. 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 November 7. The live estimate below shows where Salisbury's water sits today.
Salisbury closing dates at a glance
| Closing window | October 14 – October 24 |
|---|---|
| Close by (deadline) | October 24 |
| First freeze, 50% probability | November 7 |
| Open by (recommended) | April 13 |
| Opening window | April 6 – April 27 |
| 61°F crossing (7-day mean) | April 27 |
| Swim-season length (80°F+ days) | 113 days |
| NOAA normals station | Salisbury · 0.7 mi · 10 ft |
A classic four-season pool calendar: open early into cold water, close late into cold water, and Salisbury's 113 days of prime swimming sit safely in between.
Four water checkpoints anchor Salisbury's year in the model: mid-April at about 56°F, mid-June at 73°F, mid-August near the 78°F peak zone, and mid-October easing through 63°F. The dates in the table are where those numbers cross the thresholds that matter.
The 12-step Salisbury winterizing checklist
Sequenced against Salisbury's October 14–October 24 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
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.
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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
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
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
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.
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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
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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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.
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Calendar the off-season checks
Set a monthly reminder from October 24 to spring: check cover tension, pump off standing water, and glance at the water level. Fifteen minutes a month protects the whole closing job.
What to buy before the rush
Every item below sells out somewhere in Maryland every October. 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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Cover pump
Standing water is a cover killer; this is the counter.
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Expansion plugs + skimmer guard
Cheap rubber that stands between ice and your fittings.
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Pool antifreeze
Backup for unverifiable lines; label rate per foot of pipe.
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Winter closing kit
Season-length winter chemicals in one label-dosed box.
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Air pillow
A soft target for the ice sheet, centered under the cover.
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Winter cover
Sized to overlap; the cheapest insurance the pool wears all winter.
How Salisbury compares locally
Statewide context: across the 9 Maryland cities we model, Salisbury's October 24 deadline sits in the earliest quarter. Nearby, Dover (54 mi) closes around October 21 and Waldorf (74 mi) around October 12 — treat gaps under a week as microclimate noise, not strategy. Spring planning restarts at the opening guide; the Salisbury pool season page keeps the whole year in one view.
Every number on this page traces to one instrument cluster: Salisbury, 0.7 miles south of Salisbury's center at an elevation near 10 feet. NOAA computed its 1991–2020 normals from roughly three decades of daily readings — long enough that one strange spring in Wicomico County barely moves the dates.
Field notes for Salisbury 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 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.
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.
Salisbury pool closing FAQ
What temperature should water be to close a pool?
The practical target is water in the low 60s°F or below at closing day. Our Salisbury model has the sustained cool-down starting October 14; closing between then and October 24 means chemistry stays put and the spring reveal is a mild one.
Can you close a pool too early?
Absolutely. A pool closed warm is an algae incubator: no circulation, fading sanitizer, and weeks of growth-friendly temperatures. Salisbury's water doesn't settle below the risk zone until around October 14 — closing much before that trades a few weekends of maintenance for a rough spring.
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 Salisbury the freeze clock starts around November 7, 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?
Expect equipment damage first — cracked pump volutes, split filter tanks, ruptured heater exchangers — then plumbing leaks that surface at startup. In Salisbury, normals put the first freeze near November 7; everything after that date is borrowed time for an unwinterized system.
When is the last safe date to close in Salisbury?
Treat October 24 as the deadline in Salisbury. It's derived from the 1991–2020 normals: the cool-down plus ten days (the freeze normal, November 7, leaves room to spare). Weather varies year to year, so watch the 10-day forecast in late October — an early cold snap moves the real deadline, and the widget above flags exactly that.
Email me when Salisbury hits the closing window
Data: NOAA 1991–2020 climate normals via Salisbury (0.7 mi); live outlook by Open-Meteo. Full attribution on the sources page. Model assumptions and error bars on methodology.