Should I Drain My Pool In The Winter?

When It Makes Sense

• Good fit: You need to perform structural repairs, resurfacing, acid washing, or major leak detection that requires the pool shell to be exposed. Draining in winter may make sense only when the work cannot wait and professionals confirm the ground conditions are safe.
• Good fit: You are permanently closing or decommissioning the pool, or local regulations require draining for certain conversion projects. In these cases, draining may be a necessary step toward demolition, backfilling, or repurposing the space.

When You Should Avoid It

• Warning sign: You have a vinyl liner or fiberglass pool and the surrounding soil is saturated or has a high water table. An empty pool can be pushed upward by hydrostatic pressure, which may crack the shell, warp the liner, or cause the pool to float out of position.
• Warning sign: You simply want to “save” the pool from freezing without a specific maintenance reason. Proper winterization usually involves lowering the water below the skimmer and returns, balancing chemistry, blowing out lines, and covering—not complete draining.

Pros and Cons

Pros

• Allows access to the pool surface, tile line, and fittings for inspection, cleaning, or renovation work that cannot be done when the pool is full.
• May reduce ongoing chemical and pumping costs if the pool is being permanently taken out of service or converted to another use.

Cons

• Risk of hydrostatic pressure damage, shell cracking, liner shrinkage, or the pool lifting from the ground, especially if groundwater is present or the pool is not designed to sit empty.
• Time, labor, and disposal costs for thousands of gallons of water, plus the expense of refilling, rebalancing chemicals, and possibly repairing winter weather effects to exposed surfaces.

Decision Checklist

• Do I have a specific, necessary reason to drain the pool, or am I trying to avoid normal winterizing maintenance?
• What type of pool do I have, and has a pool professional checked the groundwater level and hydrostatic pressure risk?
• Have I confirmed where the water will go and whether local regulations require permits or restrict discharge?

Alternatives to Consider

Most pools are better protected by standard winterization: lower the water to the manufacturer’s recommended level, balance the water chemistry, add winterizing chemicals, blow out and plug the plumbing lines, drain pumps and filters, and install a secure cover. For minor surface cleaning, a partial drain may expose the tile line without emptying the entire pool. If algae or water quality is the concern, a deep clean and proper chemical treatment before closing is often safer than draining.

Final Recommendation

Do not drain a pool in winter unless you have a clear maintenance, repair, or decommissioning reason and you have consulted a licensed pool professional. For routine seasonal closure, winterize the pool while leaving water in it. If draining is necessary, hire a pro to assess hydrostatic pressure, manage water disposal, and protect the shell from cold-weather damage. Pool structure repairs can be expensive, so expert guidance is usually worth the cost.