Online alarm clock for 11:00 pm
Before covering the citrus trees, you are setting an alarm for 11:00 pm so the frost protection is not forgotten later. That leaves the evening free for other jobs while giving you a clear cue to take the covers, pegs and torch outside when the time arrives.
Because the citrus depends on hearing the signal, test the alarm now, while there is still time to adjust the volume and confirm the sound is noticeable from the next room. Keep the browser session active and the computer awake: otherwise the citrus reminder will not sound, and the coldest part of the night could arrive before the trees are covered. A separate phone alarm provides sensible backup if you may step away.
If the trees are at another property, allow for the road rather than treating 11:00 pm as your departure time. Late-evening traffic may be light, but rural roads, long driveways and an unfamiliar gate can still add minutes. Work backwards from the journey you actually expect, then leave enough time to park, carry the covers over and secure them before the alarm marks the planned covering time.
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