From May to November 2019, over 30,000 humpback whales will migrate from the cold waters of Antarctica to the warmer waters off north east Australia to mate and give birth before heading south again.
Vantage spots for whale watching include national parks with lookouts, headlands and foreshores.
Southern right and minke whales may also be spotted off the NSW coast during migration season.
Keen whale-watchers can download the free Wild About Whales mobile app, which helps users find the best locations for spotting whales, get real-time notifications of nearby sightings, and record their sightings.
Environment Minister Matt Kean said the app is a great tool for the whole family to learn more about whales, while also contributing to a citizen science project.
“Citizen science volunteers and other organisations such as ORRCA do an amazing job of monitoring the number of whales migrating along the NSW coast each season,” Mr Kean said.