"The excessively wet ground conditions meant the contractors needed to wait for the silts and gravels to dry out before they could progress with the work, which unfortunately has impacted on the construction programme," he said.
"We were originally hoping to have the athletics track up and running in March next year but the delays to the earthworks programme mean work on the track is unlikely to be completed until May 2018.
"Provided we don't get excessive rain over the summer we hope to have the hockey pitches ready for use in July,'' Bailey said.
The outdoor tennis courts will be the next to open – in spring 2018 – followed by the rugby league fields – in the 2018/19 summer.
"We're working very closely with the sports codes in the development of Nga Puna Wai and they understand the reasons behind these delays.
"Both athletics and hockey have plans in place to ensure their sports' needs are met until their new facilities are ready for use,'' Bailey said.