The regular season began on Friday 16 April and ended on Saturday 14 August.
The 2021 NBL1 season was scheduled to include a National Finals in Melbourne featuring the West champions but the event was cancelled due to the uncertainty surrounding border control restrictions across Australia.
[1] In October 2020, Basketball Western Australia and the National Basketball League (NBL) announced a new partnership to bring NBL1 to Western Australia in 2021, with NBL1 replacing the SBL.
[2][3][4] Seventeen rounds of competition was scheduled, with the regular season beginning on Friday 16 April.
The finals began on Friday 20 August and consisted of four rounds.