The Complete Pool Opening Checklist for Denver Homeowners

Wait until nighttime temperatures are consistently above 40°F — typically late April to mid-May in the Denver metro. Opening too early risks a late freeze damaging your newly filled plumbing. Opening too late gives algae a head start in warming water.

• Pump any standing water off the cover before removing it
• Have a second person help — a wet cover is heavy and awkward
• Rinse the cover with a garden hose, let it dry completely
• Fold and store in a bag or bin to prevent mold and rodent damage
• Inspect the cover for tears or damage — repair or replace before next fall

• Walk the pool perimeter and look for cracks in the deck or coping
• Check the waterline tile for cracking or popping (freeze damage)
• Inspect all visible plumbing fittings and unions for cracks
• Look for any shifting or heaving in the pool shell (rare but possible)
• Note any damage before starting equipment — running water through cracked plumbing can cause flooding

• Reinstall drain plugs in the pump, filter, and heater (these were removed for winterizing)
• Reconnect any unions or fittings that were disconnected
• Reinstall return jet fittings and skimmer baskets
• Reconnect the heater if it was disconnected
• Replace any O-rings that look cracked or compressed — now is the time

• The water level should be at the midpoint of the skimmer opening
• If the pool lost significant water over winter, use a garden hose — this may take several hours
• Do not run the pump until the water is at the correct level
• Check for any leaks as the water rises

• Turn on the pump and check for leaks at all fittings immediately
• Check the filter pressure gauge — note the starting pressure as your 'clean' baseline
• Run the pump for at least 30 minutes before testing water chemistry
• Check that all return jets are flowing and skimmers are pulling water
• If you have a heater, test it at low heat first — don't run it at full temperature immediately
• If you have a salt system, inspect the cell for calcium buildup and clean if needed

• Take a water sample to a pool store or use a professional test kit (not just test strips)
• Adjust pH to 7.4–7.6
• Adjust total alkalinity to 80–120 ppm
• Adjust calcium hardness to 200–400 ppm
• Add stabilizer (cyanuric acid) to 30–50 ppm if needed
• Shock the pool with a full dose of chlorine shock
• Run the pump for 24 hours after shocking before swimming

• Brush all walls, steps, and the floor to loosen any algae or debris
• Vacuum the pool — use a manual vacuum for heavy debris rather than an automatic cleaner
• Clean the skimmer baskets and pump basket
• Backwash or clean the filter after vacuuming
• Run the pump continuously for 48–72 hours after opening to fully circulate and filter the water

Let 360 Pool Pros Handle Your Pool Opening

Our professional pool opening service covers every step on this checklist — equipment inspection, startup, water balancing, and a full clean — so your pool is swim-ready from day one. We serve Denver, Aurora, Littleton, Centennial, Highlands Ranch, Parker, and surrounding areas.

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