As fall arrives in Winnipeg and temperatures start dropping toward freezing, it’s time to think about closing your pool for the winter. Manitoba’s harsh winters demand thorough winterization to protect your investment from freeze damage, cracked pipes, and costly spring repairs. Whether you’re tackling this yourself or planning ahead, this comprehensive checklist will walk you through every essential step to properly close your pool before the first hard freeze.
Timing Your Pool Closing in Winnipeg
The ideal time to close your pool in Winnipeg is typically mid-to-late September, when daytime temperatures consistently stay below 15°C (59°F). Closing too early while the water is still warm encourages algae growth under the cover, but waiting too long risks freeze damage if an early cold snap hits. Watch the forecast closely in September — you want to complete the process before overnight temperatures approach 0°C. Most Winnipeg pool owners aim to have their pools closed by the end of September or the first week of October at the latest.
Chemical Balancing and Shocking
Start by testing and balancing your water chemistry 3-5 days before your planned closing date. Your pH should be between 7.2-7.6, alkalinity between 80-120 ppm, and calcium hardness between 180-220 ppm. These balanced levels prevent corrosion and scale buildup during the long Manitoba winter.
Next, shock your pool with a chlorine shock treatment, using 2-3 times the normal amount. This heavy dose kills bacteria and algae that could multiply under your winter cover. Run your filter for 24 hours after shocking to circulate the chemicals thoroughly. Add a quality winterizing chemical kit, which typically includes algaecide and stain preventer formulated specifically for winter conditions. These products provide months of protection when your pool sits dormant.
Cleaning and Equipment Preparation
Give your pool a thorough cleaning before closing. Skim all debris from the surface, vacuum the bottom completely, and brush the walls and floor. Any organic matter left behind will decompose over winter and create a mess come spring. Clean your skimmer baskets and pump strainer basket one final time.
Lower your water level to approximately 15-20 cm (6-8 inches) below the skimmer opening — this prevents freeze damage to the skimmer and allows for ice expansion. For pools with tile lines, keep water below the tile. Never drain your pool completely, as ground pressure can cause structural damage, especially during Manitoba’s freeze-thaw cycles.
Protecting Your Equipment
Blow out all plumbing lines using a shop vacuum or air compressor to remove standing water that could freeze and crack pipes. This is the most critical step for Winnipeg pools. Add non-toxic pool antifreeze (not automotive antifreeze) to lines, skimmers, and any equipment that can’t be fully drained. Remove and store your pump, filter, heater, and any removable fittings in a dry location where they won’t freeze. Drain and clean your filter thoroughly — sand filters should be set to “winterize” position if applicable.
Final Steps and Cover Installation
Install winter plugs in all return lines and skimmer openings to prevent water from entering the plumbing system. Remove ladders, diving boards, and any removable accessories, storing them indoors or in a shed. If you have an automatic pool cleaner, clean it thoroughly, drain all water, and store it indoors.
Finally, install your winter cover securely. In Winnipeg, a safety cover or solid winter cover with a proper water bag or cable system is essential to handle heavy snow loads and ice. Ensure the cover is tight and secure — Manitoba winds can be fierce in winter. Consider using a cover pump to remove excess water and snow melt throughout the season, preventing sagging and damage.
If you’d rather leave this detailed process to experienced professionals, Swim & Spas offers complete pool closing services throughout Winnipeg. Our technicians handle every step of winterization properly, giving you peace of mind that your pool is protected through Manitoba’s toughest months. Check our pool services pricing or contact us to schedule your fall closing before the rush.