New Zealand's holiday parks are more popular than ever, but Kiwi holidaymakers should still be able to find room in all but the most popular destinations.

Holiday parks hosted a record 545,000 guest nights in October, up 77,000 (16.4 per cent) on the same month in 2016.

"This was a bigger increase for October than for hotels, motels or backpackers. Holiday parks have a growing appeal to a wide range of travellers – families, grey nomads and young road trippers," Holiday Parks New Zealand chief executive Fergus Brown says.

HPNZ has 300 member parks around New Zealand.

"The great weather we have been experiencing around the country offers perfect conditions for a New Zealand summer holiday. A few holiday parks are already booked out over the peak Christmas/New Year period but most have plenty of room to welcome more visitors," says Fergus.

"The annual occupancy rate for holiday parks is under 20 per cent, so there is seldom any problem finding sites for guests in campervans, motorhomes, caravans and tents in a holiday park."

The growth in guest nights is partly due to the increase in the range of accommodation and facilities available at holiday parks, which gives visitors plenty of options. Many parks have invested considerably in new motel apartments, cabins, communal facilities and leisure facilities such as swimming pools, says Fergus.