Pool Salt Calculator: How Much Salt Do I Add?
Answers: how much salt do I add?
Opening & closing
When to open your pool in spring and close it for winter, timed to your local climate, and what to protect from freezing nights.
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- Reviewed Oct 3, 2026
Set your ZIP to see dates for your area.
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Pool Volume Calculator: How Many Gallons Is My Pool?
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Pool & Spa Seasonal
Calculator
When to Open Your Pool: Estimated Dates for Your City and State
Open before the water warms past 60°F and after freezing nights end. Estimated opening dates for 49 cities from NOAA climate normals, and how the 70°F rule compares.
Pool & Spa Seasonal
When to Close Your Pool: Estimated Dates for Your City and State
Close once the water stays below 65°F, or 60°F to be safer, and before freezing nights. Estimated dates for 46 cities from NOAA climate normals.
Newsletter
Seasonal reminders for your ZIP
Get a short email when it’s time to overseed, start seeds, open the pool or service your furnace — timed to your climate.
Check your inbox to confirm. Your first reminder will arrive when it’s time.