New Zealand's calendar runs backwards from the Northern Hemisphere

Harvest: February to April

Grape harvest, or "vintage," runs through late summer into autumn — roughly February through April, with exact timing shifting year to year based on the season. This is when both regions are at their most active: pickers in the vineyards, wineries running at full capacity, and the countryside turning gold and red as the vines change colour after fruit is picked.

Summer: December to February

The warmest, driest stretch in both regions, and the most popular with visitors generally. Expect the longest cellar-door hours and the biggest crowds at well-known producers — book ahead more than any other season.

Winter: June to August

Marlborough stays mild by comparison; Central Otago does not. Queenstown and Wānaka become ski destinations through winter, which brings a different kind of crowd into the region and can shorten cellar-door hours at smaller, seasonal producers — check ahead rather than assuming summer hours apply.

Shoulder seasons: spring and autumn outside harvest

Spring (September–November) and the quieter parts of autumn are the best trade-off in both regions: fewer visitors, easier bookings, and — outside the exact harvest weeks — a landscape that's often more photogenic than the summer crowds.