Pools generally open between late April and early June depending on location and type, with public pools sometimes opening later due to regulations. For example, in Washington DC, outdoor pools are open on weekends only before June 22, 2025, then switch to a six-day weekly schedule starting June 23, 2025. Some pools open as early as Memorial Day, May 26, 2025. Other cities like Philadelphia and Schenectady have pool openings mostly in late June or July 2025. Specific opening dates vary by pool and city, so it's best to check locally for the exact date in your area.