Slugs Return From Capistrano Day

Slugs Return From Capistrano Day is a humorous, unofficial observance. Since many places celebrate birds returning from warmer climates, this day playfully imagines a “return” of slugs to gardens. It is observed each year on May 28.

History of Slugs Return From Capistrano Day

Slugs Return From Capistrano Day was created by Tom and Ruth Roy of Wellcat. The couple is known for inventing quirky, lighthearted observances for fun.

According to a popular belief, swallows return on March 19 to Mission San Juan Capistrano in California. Before that date, slugs may be eaten by the birds. After the swallows leave again, slugs gradually reappear in gardens. Since slugs move slowly, the “return” is humorously said to take about two months, which is why May 28, roughly two months after March 19, was chosen.

Interesting Facts About Slugs Return From Capistrano Day

• A small number of slugs can be part of a garden ecosystem, but large populations can seriously damage plants.
• Slugs have existed on Earth for a very long time, based on fossil evidence of their ancient relatives.
• A slug can eat a surprising amount relative to its size.
• Some species can grow quite large, especially in wetter climates.
• Depending on the species and conditions, slugs may live for several years.

How to Take Part in Slugs Return From Capistrano Day

This day is a fun excuse to learn more about slugs and their role in nature. It can also be a practical time to inspect your garden and, if needed, use safe, responsible methods to protect plants from slug damage.

When Is Slugs Return From Capistrano Day in 2026?

Slugs Return From Capistrano Day is observed every year on May 28.

Observations