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

New Braunfels closing dates at a glance

With 182 days of 80°F-plus highs, New Braunfels 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: New Braunfels's estimated pool temperature runs about 65°F in mid-April, 79°F in mid-June, 84°F in mid-August, and 71°F in mid-October, peaking near 84°F. Those four checkpoints — not any calendar holiday — are what the windows above are protecting.

The 12-step New Braunfels 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

   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.

3. 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.

4. 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.

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

   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.

7. 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.

8. 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.

9. 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.

10. 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.

11. Stage the cover pump

    Solid covers need drainage all winter: set a cover pump or siphon before the first storm, not after. Standing water strains seams and invites a mid-winter emergency.

12. Note this year's dates

    Jot down when New Braunfels'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

A small stack of supplies turns the checklist above into a single-weekend job. Buy before New Braunfels's November rush and the whole list ships at leisure instead of sprinting.

• Cover pump

  Solid covers collect rain all winter; this is the drainage plan.

• Expansion plugs + skimmer guard

  Cheap rubber that stands between ice and your fittings.

• Pool antifreeze

  Backup for unverifiable lines; label rate per foot of pipe.

• Winter closing kit

  Closing chemistry in one box, dosed by pool volume.

• Air pillow

  Gives ice somewhere to push besides your pool walls.

• Winter cover

  Measure with overlap; the winter workhorse over everything else.

How New Braunfels compares locally

Two nearby data points to triangulate with: San Marcos, 16 miles from New Braunfels, models its close at November 21 (about a week later); San Antonio, 30 miles out, at November 21. New Braunfels's own window ends November 11. For the other half of the calendar see when to open in New Braunfels, or scan the full year on the season page.

The measuring stick here is New Braunfels — 4.0 miles to the southwest, elevation about 720 feet. Its 1991–2020 record is what the model reads for New Braunfels; your backyard in Comal 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 New Braunfels 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.

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.

What comes indoors

Cartridges, the cover pump when idle, chemical containers, and anything with a small motor overwinter better in the garage. Cold cycling is hard on plastics and seals; shelf space is cheaper than replacements. Label a single bin now and spring assembly becomes a scavenger hunt with a map.

The case for a shorter off-season

New Braunfels'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 11 for a reason. Closing late and cold beats closing early and warm in every spring-condition metric that matters.