As Colorado feels its coldest temperatures since May, many are wondering when they should winterize their sprinklers.

Close any open drain valves or test cocks. Open the sprinkler water supply valve. Do this slowly to avoid pressure spikes. Turn the controller back on and run each zone manually to check for leaks, ...

Water until the grass stops growing because, as long as this happens, even if the turf is growing slowly, it is still using water. How long grasses grow in cool weather depends on the type.