Yes – if you're driving up to ski fields in New Zealand, carrying snow chains is highly recommended, and sometimes legally required. Most ski areas like Coronet Peak, The Remarkables, Cardrona, Mount Hutt, and Turoa have alpine access roads that can be icy, snowy or steep – especially during winter (June to August).
Even if you're in a 4WD, ski field operators or road signs may still instruct you to fit chains before ascending, depending on conditions. It's common to see checkpoints or signs that say “Chains must be fitted beyond this point.” If you don’t comply, you can be turned around or fined.
Tip for Car Rentals: Hire cars often don’t come with snow chains by default – ask for them when booking and make sure you know how to fit them before you head up the mountain.