Open and Modified Swim times vary throughout the week dependent on swimming lessons. Please visit this link for the current pool schedule: https://www.thorntonco.gov/recreation/facilities/Documents/2021%20TWRC%20Summer%20Pool%20Schedule.pdf
It closes at 5, but if you have a reservation I do believe if you have a reservation you can stay after hours, you can look into it on their website or call them
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