About 15 minutes earlier in Lismore, near Ashburton, a man in his 30s was shot in the wrist and flown by helicopter to Christchurch Hospital.
Police around the country also received numerous complaints about gunshots being heard close to people's properties.
In one incident, a house in Waipara, north of Christchurch, was hit on the roof and windows, Inspector Mike Coleman said.
Firearms Safety Specialists NZ spokeswoman Nicole McKee was "bitterly disappointed" that the season had kicked off with such serious incidents.
McKee urged hunters to be mindful of their legal responsibilities, including for unlicensed shooters to be supervised by a licence-holder.