But he wouldn't be drawn on whether Northland farmers needed to examine the merits of Brahman cattle or growing bananas and pineapples in the hotter times ahead.
Northland had a diverse economy including horticulture, pastoral farming, forestry, tourism, 116,000ha of Maori land and other undeveloped resources, the minister said.
"This region is an important part of New Zealand with massive potential," he said.
Regarding climate change, the Government had spent $90.34 million since 2010 on Global Research Alliance projects and planned to spend $400 million on water storage, including $80 million in this year's budget.
The Blackwells have 320 bulls, 20 wagyu steers, 600 Coopworth ewes and 170 lambs on their 345ha farm, which got 36mm of rain a couple of weeks ago and is green compared with coastal farms left grassless after drought since October.
Mr Blackwell said he had sold stock as feed declined and he would sell some bulls if rain didn't come soon.
Before leaving to inspect Waikato and Bay of Plenty drought areas, Mr Guy also said he hoped the drought would break soon.
Rain could be near. The MetService 10-day forecast predicts showers for Dargaville on Sunday, Tuesday, Wednesday and Thursday next week.
The Northland Rural Support Trust seeks grazing and supplementary feed for drought-hit farmers. To help, ring 0800 787 254.