The event will take place over three days from Friday, October 22 to Monday, October 25 and is run by the Atlas of Life, a citizen science organisation.

This is the second time the event is running, after organisers were astounded by the huge participation rates across Australia last year.

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Atlas of Life chair Libby Hepburn said the GSB was born from a citizen scientist desire to have a springtime survey of the biodiversity on the South Coast.

"[It's] during a time of year we know is abounding with emerging life. Flowers are blooming, insects take wing, and birds call for mates," she said.

"Each time an observation is made, it will be identified and used as a data point for that species creating a valuable piece of scientific data which can be accessed for all sorts of important biological research."

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There will be several special focus activities during the three-day Bioblitz including a moth night, a parrot prize and a sea slug census.

"We hope to have a number of get together mini-blitzes at different places, and we are also promoting the idea of backyard biodiversity surveys," Ms Hepburn said.

"All you need is an iNaturalist account, a device to take photos of wildlife, and all the enthusiasm you can muster."

Atlas of Life moderators and identifiers will be available to help people identify the species they record.

To find out more information about this project, also visit the Bioblitz website, the Atlas Great Southern Bioblitz webpage or contact Ms Hepburn at libby@atlasoflife.org.au.