Online alarm clock for 10:21 pm
Before handing the watering over to someone else, set the alarm for 10:21 pm and make clear which tap, valve or controller they need to switch off. That gives the next person a definite cue instead of relying on a message remembered later. If they are also checking the garden before 11:00 pm, agree whether the alarm means stop immediately or inspect the soil first.
While the watering continues, this alarm page may be pushed behind another browser page as messages or weather information are checked. Leave the browser running and return to the alarm page before 10:21 pm so the alert remains easy to notice. The watering reminder cannot sound after its browser session has ended or the phone has gone to sleep, so the person taking over should also use their phone’s built-in alarm if missing the shut-off could leave the sprinklers running overnight.
For a late-evening handover, ask the other person to step outside briefly rather than judge conditions from indoors. At 10:21 pm, cooler air can make the garden feel damp even when exposed soil still needs checking. They can feel the soil near a sprinkler edge, look for pooling around paths, and note whether humid air is slowing evaporation before switching the watering off.
Common questions
Why use a browser alarm instead of my phone's built-in one?
Mainly for reliability against silent mode, do-not-disturb, or a phone left charging out of earshot. It's a useful backup or a desk-based alternative, though it depends on this tab staying open rather than running in the background of your phone.
Is there a cost to use this?
No, it's free, with no sign-up and no limit on how many times you set it. It just needs the tab left open until the time you've chosen arrives.
Will the alarm still ring if I close the browser tab?
No. The alarm only runs while this tab stays open — closing it, or closing the browser entirely, stops the countdown before it can ring. Keep the tab open in the background if you need it to go off later.
Does the alarm work if my laptop goes to sleep?
Not reliably. If the device sleeps or the screen locks, the browser tab pauses along with it, so the alarm may not fire on time or at all. Adjust your power settings if you're relying on this over a longer stretch.
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