This page has not been updated since the DXpedition.
The table below shows the likely propagation to Niue from various parts of the world. It is available as a .pdf file here: Propagation summary chart
Also, courtesy of Stu, K6TU, here is a link to a VOACAP prediction model which has been pre-loaded with the E6GG location and will give you predictions from your location. Click here for a higher definition Propagation summary chart in pdf