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Environment day

World Horseshoe Crab Day is coming up.

Sunday, 20 June 2027

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About World Horseshoe Crab Day

World Horseshoe Crab Day is marked on 20 June each year. It’s one of the environmental days listed on Wikipedia.

In 2027 it falls on a Sunday; in 2028 it’s on Tuesday 20 June, and in 2029 on Wednesday 20 June. This time it falls at the weekend; some countries move the day off to a weekday when that happens. Also in June 2027: World Refugee Day (20 Jun), Father’s Day (20 Jun) and National Vanilla Milkshake Day (20 Jun). From this page you can add it to your calendar, get an email before it, share the countdown, or show it full screen.

How we work out the date
It’s on 20 June every year.
Sources

Page updated 5 November 2026. Report a wrong date

Dates

YearDate
2027Sunday, 20 June
2028Tuesday, 20 June
2029Wednesday, 20 June
2030Thursday, 20 June
2031Friday, 20 June
2032Sunday, 20 June
2033Monday, 20 June
2034Tuesday, 20 June
2035Wednesday, 20 June
2036Friday, 20 June

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