Quick Answer
December to March for summer activities (hiking, beaches, road trips). January-February is peak season — best weather but busiest and priciest. March is the sweet spot: warm, fewer crowds, autumn colours starting in the south. June-September for skiing in Queenstown, Wanaka, and Ruapehu.
Summer (December–February)
Long days (light until 9:30pm), warmest temperatures (20-28°C in the north, 15-22°C in the south). Great Walks are open and bookable. Beaches are swimmable in the north. Road trip conditions are ideal. Downsides: Christmas/New Year is peak domestic holiday — accommodation doubles in price and campgrounds fill up. Book DOC huts 6+ months ahead for Great Walks.
Autumn (March–May)
March is arguably the best month: warm days, stable weather, crowds gone, and autumn colours beginning in Queenstown/Wanaka (late March-April). April sees the first snow on mountain peaks — dramatic photography. May is getting cold in the south but the North Island stays mild. Great Walks close mid-April to late October (huts close for winter).
Winter (June–August)
Ski season! Queenstown (Coronet Peak, The Remarkables), Wanaka (Cardrona, Treble Cone), and Ruapehu (North Island). Southern Alps get reliable snow. Milford Sound in winter is hauntingly beautiful — fewer tourists, waterfalls everywhere, snow-capped peaks. Roads can close temporarily (Milford Road, Crown Range) — check conditions.
Campervan Tips by Season
Peak campervan season: December-February — book 3-6 months ahead. Freedom camping at designated sites is legal but regulated (check CamperMate app). Shoulder season (March, October-November) offers better rental rates (30-40% cheaper). Winter campervanning is cold but doable with a self-contained van. DOC campgrounds ($8-15/night) are the best value in summer.