Can You Run a Generator in the Rain?

Red portable backup generator set up outdoors on a lawn

Short answer: not directly, and not under a tarp either. Here’s the safe way to run a generator during a storm without risking electrocution or a fire.

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Storms are exactly when you need a generator most, and exactly when running one is riskiest. Water and electrical equipment don’t mix, and a generator’s outlets, cord connections, and internal electronics are not designed to get wet directly. The good news: there are proper, inexpensive ways to run a generator safely in the rain.

Never do this: run a generator inside a garage or shed with the door open, cover a running generator with a tarp draped directly over it, or run it under a structure with poor ventilation. Both carbon monoxide buildup and fire risk from heat trapped against a tarp are real dangers, not theoretical ones.

The Right Way to Run a Generator in Rain

Solution Why It Works
Open-sided generator canopy/tent Purpose-built for this exact scenario — allows airflow while blocking direct rain
Generator cover with a stand-off frame Keeps fabric from contacting hot engine parts while shedding water
Placement At least 20 feet from the house, doors, and windows, on a dry, level, elevated surface
GFCI protection Use a GFCI-protected outlet or extension cord, especially in wet conditions

The key feature of a proper generator canopy or tent is open sides — it blocks rain falling from directly above while still allowing the airflow the engine needs for cooling and safe exhaust dispersal. A draped tarp, by contrast, traps heat and exhaust against the unit, which is both a fire risk and a carbon monoxide risk.

Pros

  • A dedicated generator tent or canopy is inexpensive and solves the problem completely
  • Elevating the generator on a stand or platform keeps it out of ground-level puddles and runoff
  • GFCI-protected cords add a real layer of protection against shock in wet conditions
  • Keeping the generator well away from the house reduces both noise and exhaust intrusion during a storm

Cons

  • Draping a tarp directly over a running generator is a common but genuinely dangerous mistake
  • Running a generator under a covered porch or carport with poor airflow still risks carbon monoxide buildup
  • Plugging in with wet hands or on wet ground without GFCI protection increases shock risk significantly

Check Generator Tent Canopy Rain on Amazon →   Check GFCI Extension Cord Outdoor on Amazon →

FAQ

Can I run a generator under a covered patio?Only if it’s genuinely open on multiple sides with good airflow. A covered patio that’s substantially enclosed can trap carbon monoxide just like a garage, even with the generator technically “outdoors.”
Is it safe to touch a generator when it's wet?Avoid it if the unit has any exposed wet electrical components. Let it dry, or use a proper canopy going forward so this isn’t a recurring issue.
Do I need a special cover, or will any tarp work?A purpose-built generator canopy or tent is designed with the airflow and clearance a draped tarp doesn’t provide. The small cost difference is worth avoiding the fire and carbon monoxide risks of improvising with a tarp.
How far from the house should a generator be during a storm?At least 20 feet from windows, doors, and vents, same as in dry conditions — rain doesn’t change the carbon monoxide safety distance, it just adds the water exposure risk on top.

Read next: Generator Won't Start After Sitting (Carb Fix) · What Size Generator Runs a Fridge AND Freezer

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The Brofessionals Editors

We research generators, solar, garden gear, and DIY tools, then cross-check every pick against manufacturer specs and real-world discussion. No pay-to-play placements — just gear we would run ourselves. How we test.

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