Thousands are expected to line the streets of the Old Town for the popular event.
Hastings Jack in the Green website reveals its origins.
It says: "It is thought that the Jack-in-the-Green custom originated around the 17th century from the milkmaids and chimney sweeps of London. As part of the May Day processions milkmaids would carry milk pails decorated with flowers and silverware. Over time the pails were replaced with decorated headdresses.
"Not to be outdone, chimney sweeps began creating garlands, which became bigger and bigger until the frameworks of greenery and flowers covered an entire man, a Jack-in-the-Green."
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5. Jack in the Green 2023. Photo by Frank Copper
Jack in the Green 2023. Photo by Frank Copper Photo: Frank Copper
6. Jack in the Green 2023. Photo by Frank Copper
Jack in the Green 2023. Photo by Frank Copper Photo: Frank Copper
7. Jack in the Green 2023. Photo by Frank Copper
Jack in the Green 2023. Photo by Frank Copper Photo: Frank Copper
8. Jack in the Green 2023. Photo by Frank Copper
Jack in the Green 2023. Photo by Frank Copper Photo: Frank Copper