The two men are thought to be unknown to each other and acted independently.
They will be appearing in the Nelson District Court this week.
Detective Superintendent Peter Read stressed that these arrests are not to do with the main fires in the area and these are still under investigation by Police and FENZ.
Meanwhile, Read said NZDF staff also observed a civilian operating a drone from outside the cordoned area during overnight patrols of Wakefield.
"They were spoken to by Police and asked to stop operating the drone, and they did so without incident," he said.
"We would remind people that the safety of the public and their properties is the priority."
There were 170 properties visited by Police and NZDF in Wai-Iti last night where residents were advised they need to prepare to evacuate quickly when given the word to do so.
"We are also aware from our MPI colleagues of rumours that some people accessing rural properties in the evacuation zone - this is across farmland, not through cordons," Read said.
"We want farmers and residents to work with us, not against us, and please ask that they respect these evacuation areas as safety is our number one priority."