They have been battling the blaze since 7:30 a.m. when a passerby first reported it.
The New Jersey Forest Fire Service says the multi-acre fire broke out near the Atsion Ranger Station on Route 206.
Over 100 acres have burned as of 11:00 p.m. Monday.
Full containment is not expected until the end of the day tomorrow.
45 firefighters have been using dump trucks and Brush trucks to plow existing roads and build a perimeter. The fire is in a remote area of the Wharton State Forest, so no homes or businesses are threatened and at this point, there are no reported injuries.
"The roads were existing, so we prep them by getting those roads back down to mineral soil, cleaning up the pine needles and the brush that are around those roads, we do backfiring and burnout operations with torches. We actually fight fire with fire," Shawn Judy of the New Jersey Forest Fire Service told Action News.
By the time, the fire is fully contained, 170-acres is expected to be burned.
The cause is under investigation, though lightning may be the reason.
A similar fire at this same location earlier in the month was ignited by a lightning strike.
The fire site is in southern Burlington County, about 10 miles northeast of Hammonton.
The Associated Press contributed to this report.