Off-duty border agent Dennis Dickey wanted to show friends the sex of his unborn child using an explosive device filled with coloured paint.
The video footage shows the moment the explosion started the Arizona wildfire as part of the gender reveal.
The blaze in April 2017 destroyed 47,000 acres and cost $8.2m.
The flames took 800 firefighters a week to get under control.
The gender reveal explosion released a blue powder before the grass caught on fire. Image: US Forest Service
Mr Dickey and his wife Rita planned to reveal the sex of their baby to their friends with the explosive device –filled with blue powder to show it was a boy.
The device was filled with Tannerite, a legal but potent explosive.
Due to the dry weather in the state, the grass around the device caught fire and spread to the Coronado National Forest.
Last month, Mr Dickey pleaded guilty to starting a fire without a permit and was sentenced to five years probation, a $100,000 fine and 4500 a month restitution for the next 20 years.