Pools generally close based on the season, local regulations, and whether they are indoor or outdoor pools. Outdoor pools often close at the end of summer or early autumn, while indoor pools may be open year-round or close for maintenance during certain times. For example, in specific locations like Littleton, CO, outdoor pools such as Harlow Pool have a season that ends around early August (closed for the season around August 10th). In cities like Munich, indoor pools have daily opening hours, closing in the evening, but specific closing seasons or maintenance periods depend on the pool.

In summary:

• Outdoor pools typically close at the end of summer, often late August or early September.
• Indoor pools usually operate year-round but may close temporarily for maintenance or specific hours in the evening.
• Exact closing dates vary widely based on location and pool type.

If a more specific location or pool type is needed, additional details could be provided.