Volunteer Alison Ruhe said the turnout was "very, very good" with about 200 people already through the gates by noon on Saturday at Myrton's Folly in Opaki.
"They come in four or five at a time - it's been pretty busy."
At the McDonald garden volunteer Debbie van Zyl counted 250 people through the gates by lunchtime. "It's fantastic. It's such a good cause - I think people support it."
At the nearby Dungallan property, first-time Wairarapa garden tourists Claire and Martin Shearman, of Wellington, were impressed at the organisation and the beauty of the gardens on the tour.
Mr Shearman got nipped by an eager eel at the ponds at Dungallan, drawing blood, but that was part of the fun.
"What is surprising is how complex the gardens are," he said.
"What is very unassuming from the outside, there's so much to be seen inside."
Funds from the garden tour will be used to help keep Pukaha wildlife safe from predators.