As Portland’s rainy season takes hold, many pool owners face a yearly dilemma: Should I drain my pool for the winter or just keep it covered? With cooler temperatures and months of wet weather ahead, the choice can significantly affect your pool’s long-term health and maintenance costs. While it may seem logical to drain the pool and forget about it until spring, doing so can actually cause more harm than good in the Pacific Northwest climate. Here’s how to decide what’s best for your pool.
The Risks of Draining Your Pool in Portland
Portland’s unique climate makes draining your pool during winter a risky move. Unlike areas with dry, freezing winters, the Pacific Northwest’s heavy rain and high groundwater levels create several hazards for drained pools:
- Structural Damage: An empty or partially drained pool can “float” or lift out of the ground if groundwater pressure builds beneath it. This can cause cracking and structural failure.
- Liner Shrinkage or Cracking: Vinyl liners can dry out and shrink, while plaster or fiberglass surfaces may crack when exposed to cold, damp air.
- Erosion and Water Table Problems: Constant rainfall can saturate the soil around an empty pool, increasing erosion and putting pressure on the walls.
- Unnecessary Repairs in Spring: Re-filling and re-balancing water chemistry in the spring can be more labor-intensive — and costly — than maintaining a properly covered pool.
Unless you have a specific maintenance reason (like major pool and spa repair), draining your pool completely isn’t recommended.
Why Keeping It Covered Is the Better Choice
For most Portland homeowners, covering your pool for winter is the best long-term option. With the right cover and ongoing care, you can protect your pool’s structure, maintain balanced water, and simplify spring opening.
1. Prevents Debris Build-Up
Falling leaves, branches, and rainwater can introduce organic waste that clogs filters and stains surfaces. A quality safety or winter cover keeps out most debris and reduces your cleaning workload.
2. Maintains Structural Integrity
Keeping your pool filled helps balance pressure between the water inside and the soil around it. This prevents cracks, bulging, or shifting caused by groundwater buildup.
3. Reduces Algae and Bacteria Growth
By maintaining proper water chemistry and a tight-fitting cover, you limit sunlight and prevent algae from blooming — even during Portland’s gray months.
4. Protects Equipment
Covered pools experience less exposure to falling debris and cold air, reducing strain on your pump and heater. Seasonal pool service ensures your system is properly winterized.
When Draining Might Be Necessary
There are a few exceptions when draining your pool may be unavoidable:
- You’re completing resurfacing, tile replacement, or other pool and spa repair.
- Your water chemistry is severely unbalanced or contaminated beyond recovery.
- There’s been storm damage requiring debris removal or a full clean-out.
Even in these cases, it’s best to work with professionals like Rose City Pool & Spa who understand Portland’s soil and weather conditions. They’ll drain safely, prevent structural lift, and manage refilling properly.
Tips for Maintaining a Covered Pool All Winter
If you choose to keep your pool covered (and you should), here’s how to maintain it throughout the rainy months:
- Inspect the Cover Regularly — Remove standing water and tighten straps to maintain tension.
- Check Water Levels — Keep water halfway up the skimmer opening to maintain proper circulation.
- Balance Chemistry Monthly — Even with a cover, test water periodically to prevent scaling or corrosion.
- Clean Surrounding Areas — Sweep debris away from the pool edge to prevent runoff contamination.
- Schedule a Mid-Winter Service — A quick visit from Rose City Pool & Spa ensures your system stays protected through the coldest months.
Protect Your Pool the Portland Way
Portland’s wet winters demand a thoughtful approach to pool care. While draining might seem like an easy solution, it can create costly structural and chemical challenges. Keeping your pool covered and well-maintained is the safest, most cost-effective option.
For expert pool service or pool and spa repair, contact Rose City Pool & Spa today. Our team helps Portland homeowners prepare their pools for winter so you can enjoy a stress-free spring opening.