Your outdoor outlet is dead. Here's the fast answer.
Most dead outdoor outlets come back to life with one press of a reset button. The trick is finding the right button.
By code, outdoor outlets need GFCI protection. That protection can live on the outlet itself, or on another outlet earlier in the circuit, or on a special breaker in your panel.
So when your outdoor outlet goes dead, the real question is which GFCI tripped and why. The why matters, because a GFCI usually trips for a reason.
Start at the outlet. Press RESET firmly. If it clicks and holds, you're done. If it doesn't, the controlling device is somewhere else, and we'll walk through where to look.
What's actually causing it
In typical service work, the order goes like this. First, a tripped GFCI on the outlet itself. Second, a tripped GFCI upstream that you didn't know controlled this outlet. Third, a breaker issue.
The upstream case fools people constantly. You'll have a perfectly fine-looking outdoor outlet with no power, and the actual reset button is in the guest bathroom nobody uses.
Water is the usual reason any of these trip. Outdoor boxes take a beating, and once a cover cracks or a gasket dries out, rain finds its way in.
Less often, it's a genuine wiring problem: a loose neutral, a corroded terminal, or a GFCI that's simply worn out after ten-plus years outdoors.
The good news is that the free fixes (resetting) are also the most common fixes. You only get into real money when there's a fault to chase or hardware to replace.