In the first stranding, on Wednesday afternoon, locals discovered a pod of about 20 dolphins floundering at the northern end of Tokerau Beach. While the animals did not appear distressed they were in calf-depth water and the tide was going out.
Tokerau Beach resident Glenys Urlich said the dolphins were "milling around in the shallows" and seemed reluctant to return to deeper water.
A large group of locals kept them wet and upright - dolphins can drown from water entering their blowholes if they tip onto their sides - and tried to herd them out to sea.
Eventually locals got the pod together in slightly deeper water and they swam away about 3.30pm, just before a rescue team arrived from DoC's Kaitaia office.
Mrs Urlich said Tokerau Beach had had a run of whale strandings some years ago so locals were well versed in marine mammal rescues.