Outdoor electrical timers switch lights, fountains, pumps and holiday displays on and off at set times, and they split into mechanical dial timers with pins, digital timers with a screen, and smart timers controlled by an app. Some also include a light sensor that switches on at dusk. The first decision is how precise and flexible the schedule needs to be.
Mechanical timers are simple and easy to set by pushing pins around the dial, which suits a daily on and off pattern for porch lights or a fountain pump. The number of settings on this page describes how finely the day is divided; more segments allow shorter on and off periods. Digital and smart timers allow different schedules on different days, random modes for security, and countdowns, and smart timers can be changed from your phone. Among the 9 products that list item weight, most fall between 0.3 and 0.7 pounds, and 0.5 pounds is typical.
Weather and load ratings matter most outdoors. A timer for outside use should state that it is rated for wet or outdoor locations, ideally with a cover that closes over the plug, and it must be rated for the load you connect. Motors such as pumps and heaters draw more current at start up than their rated wattage suggests, so leave a margin.
Before buying, check the outdoor rating, the maximum load in amps or watts, how many outlets the timer has and whether they are controlled together or separately, and whether a single unit or a pack is listed. Mount the timer off the ground and away from sprinklers, and plug it into an outlet protected by a ground fault circuit interrupter. Smart outdoor plugs also need a strong home network signal at the outlet, which can be weak in a garden.
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