Seeing more snails than usual? Hawaiʻi’s warm climate, combined with recent rainy weather, creates the perfect conditions for snails to thrive, making them a more common sight across neighborhoods and businesses.
While many people see snails as harmless garden visitors, some species can damage landscaping, spread rapidly, and become difficult to manage. Here’s what Hawaiʻi property owners should know about the snails commonly found around the islands.
Why Are Snails So Active Right Now?
Snails thrive in damp, humid conditions. Rainfall keeps the ground moist, provides plenty of food sources, and allows them to travel without drying out. During wetter periods, you may notice snails:
- Crawling across sidewalks, patios, and driveways
- Feeding on flowers, vegetables, and ornamental plants
- Gathering under pots, rocks, mulch, and dense ground cover
Rain softens the ground, keeps snails from drying out, and creates conditions for feeding and reproducing. During wetter periods, populations can seem to increase almost overnight.
The same damp conditions that encourage snail activity can also increase activity from other moisture-loving pests, including slugs, cockroaches, centipedes, and mosquitoes. If you’ve noticed one pest becoming more active after heavy rain, there’s a good chance others are benefiting from the same conditions.
Common Snails Found in Hawaiʻi
Giant African Snail
One of the most concerning invasive snails found in Hawaiʻi is the Giant African Snail. Growing up to eight inches long, these snails are feed on many plant species, threatening gardens, landscaping, and agriculture.
What makes them especially challenging is how quickly they reproduce. A single Giant African Snail can lay hundreds of eggs several times throughout the year, allowing populations to grow rapidly when conditions are warm and wet.
Beyond damaging plants, Giant African Snails can also carry the parasite that causes rat lungworm disease. While people typically become infected by accidentally consuming infected snails, slugs, or contaminated produce—not simply by touching or seeing a snail—it’s still important to avoid handling them with bare hands and to thoroughly wash fresh fruits and vegetables from your garden.
Common Garden Snails
Smaller garden snails are a familiar sight throughout Hawaiʻi. While they may not cause the same level of damage as larger invasive species, they can still feed on young plants, flowers, herbs, and vegetables, especially when conditions are consistently wet.
Why Invasive Snails Matter
Beyond leaving behind slime trails, invasive snails can become a serious nuisance for both homeowners and businesses.
Large populations may:
- Damage landscaping and ornamental plants
- Feed on vegetable gardens
- Leave unsightly slime trails on walkways and entryways
- Reproduce quickly during wet weather
- Become difficult to control once established
How to Help Keep Snails Away
While no property is completely immune, a few simple maintenance practices can make your landscape much less inviting.
Reduce Excess Moisture
Avoid overwatering landscaping and repair leaking irrigation systems when possible. The less standing moisture available, the less attractive your property becomes to snails.
Remove Hiding Places
Snails love cool, protected spaces. Regularly remove piles of leaves, excess mulch, boards, unused pots, and other debris where they can hide during the day.
Maintain Your Landscape
Trim dense vegetation and ground cover to improve airflow and allow more sunlight to reach the soil. A drier landscape is less favorable for snail activity.
Check New Plants
Before bringing new plants home, inspect leaves, containers, and the surrounding soil for snails or eggs that could be introduced into your landscape.
Slow Moving, But Quick to Spread
They may not be the fastest pests you’ll encounter, but under the right conditions, snail populations can grow surprisingly quickly. While spotting an occasional snail after a rainy day is perfectly normal in Hawaiʻi, large numbers can become a nuisance for your landscape and outdoor spaces.
You can’t make your property completely immune to snails, but reducing excess moisture, maintaining your yard, and eliminating common hiding places can go a long way in making your landscape less inviting. A little preventative maintenance today can help keep snail activity under control tomorrow.










