Do Coffee Grounds Really Repel Mosquitoes?

If you’ve ever heard someone say “Just burn some coffee grounds to keep mosquitoes away,” you’re not alone. It’s one of the most-shared backyard hacks out there. But does it actually work? And if so, why? We’re breaking down the science, the myth and how Southern Ground turned this idea into a cleaner, more effective solution.

The Myth

Burning used coffee grounds has long been a DIY trick passed around by campers, gardeners and outdoor lovers. The smoke from burning coffee is said to deter mosquitoes and other flying insects, and while there’s some anecdotal support, the real story is more complex.

What Actually Works

Coffee grounds on their own produce a lot of smoke and not much else. The scent is inconsistent, the burn is hard to control and not everyone loves the smell of burnt coffee. While smoke can help move mosquitoes away temporarily, it doesn't provide long-lasting protection on its own.

That’s where essential oils come in. Research shows that oils like citronella, cedarwood, cinnamon and lemongrass are far more effective at repelling mosquitoes. When these oils are blended with a slow-burning base, they release scents that bugs avoid—without the harsh chemicals found in most sprays.

Our Approach

At Southern Ground, we started by experimenting with used coffee grounds and quickly ran into all the common issues: mold, messy burns and inconsistent results. So we kept tweaking the formula.

Today, our products use recycled coffee grounds blended with sawdust and infused with natural oils. The result is a clean-burning incense that smells great and actually helps keep mosquitoes away. No chemicals. No harsh smoke. Just a better outdoor experience.

So, do coffee grounds repel mosquitoes? Not on their own. But when blended with the right materials and oils, they become part of a natural, sustainable solution that really works.