The best time to close your swimming pool after its season is when the warm weather season ends and before it turns freezing. Algae growth is minimal during this time, which makes for an ideal and seamless pool closing process.
Pool services typically involved in a pool closing include draining of water to proper winterization levels, blowing out the plumbing lines, winterizing filtration equipment, adding pool chemicals, swimming pool cover installation and disassembling all pool accessories including ladders, diving boards and lights.
Read more about winterizing your pool here.