Firefighters took more than an hour to bring the blaze under control, in temperatures close to the 28C high at midday.
The brigade members had to drag sections of hoses through fences and up to 100m at a time, in full protective gear, then wait in choking smoke for water to be connected.
The fencelines along the burning shelter belts were all live with electric fences, adding to the frustration.
Carterton's 13,000-litre tanker provided the difference, re-stocking in Featherston.
Crew from the Wairarapa Rural Fire Force remained on the scene to deal to smouldering stumps and determine the cause of the fire.
It was speculated an electric fence short might have been responsible.
Fire crews were called back yesterday about 11.30am after the fire "re-ignited" in a small spot which was doused quickly.
Meanwhile, sweltering temperatures caused tyres on the silage stack of a Maungahau Rd, Waingawa farm to ignite at about 3pm resulting in the call-out of a fire crew and water tanker. Thick smoke billowed across the area.