When to Close Your Pool in Midland, TX: Deadline, Window & Checklist

Midland closing dates at a glance

With 197 days of 80°F-plus highs, Midland 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.

Four water checkpoints anchor Midland's year in the model: mid-April at about 64°F, mid-June at 80°F, mid-August near the 82°F peak zone, and mid-October easing through 69°F. The dates in the table are where those numbers cross the thresholds that matter.

The 12-step Midland 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.

1. 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.

2. 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.

3. 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.

4. Apply winter chemicals per label

   Run the winter kit through moving water: dose each product per its label with the pump on, give it a few hours to distribute, then start the shutdown. Chemistry added to still water stays where it lands.

5. Lower the water level

   Drop the level as your cover manufacturer specifies — typically below the skimmer mouth for solid covers. Never drain a pool fully; groundwater pressure can damage the shell.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

11. 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.

12. 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.

What to buy before the rush

Every item below sells out somewhere in Texas 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.

• 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

  Season-length winter chemicals in one label-dosed box.

• Air pillow

  A soft target for the ice sheet, centered under the cover.

• Winter cover

  The one purchase every other closing step depends on.

• Cover pump

  Keeps rain and melt off a solid cover all season.

How Midland compares locally

Two nearby data points to triangulate with: Odessa, 17 miles from Midland, models its close at November 6 (about a week later); San Angelo, 106 miles out, at November 3. Midland's own window ends November 2. For the other half of the calendar see when to open in Midland, or scan the full year on the season page.

The measuring stick here is Midland 4 ENE — 5.2 miles to the east, elevation about 2776 feet. Its 1991–2020 record is what the model reads for Midland; your backyard in Midland 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 Midland owners

Cold water is the whole point

A pool closed at 55°F barely changes all winter: algae are dormant, chemicals hold, and spring opens with a light dusting instead of a bloom. A pool closed at 72°F runs its own quiet ecosystem under the cover for a month. The date matters less than the water temperature it represents.

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.

The case for a shorter off-season

Midland'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 2 for a reason. Closing late and cold beats closing early and warm in every spring-condition metric that matters.