Crews remained on scene Tuesday night to secure the scene and make sure the fire doesn't flare up once again.
Just before 12:30 a.m., someone passing by called in the fire.
After departments from four counties fought a fire for most of the day, Clay County Sheriff Jeff Franklin said Oregon Trail Equipment is likely a total loss.
"It only worked because of a lot of mutual aid and a lot of good people that volunteered a lot of time out there and worked very hard," said Franklin.
The sheriff estimates 20 departments were on the scene at 1134 Highway 74 in dangerous heat.
"We had a lot of them that were fatigued from the heat. They're wearing bunker gear and they're in a very hot scene and wear multiple air packs too," said Franklin.
No injuries have been reported.
Now the investigation into the cause begins.
The state fire marshal and an insurance investigator have been on scene.
But, officials said, because of the chemicals in the building, dangers do remain.
"There's still a few hot spots. They had to wait for the fire to be out to start their investigation so that could be going on for days," said Franklin.
At the Fairfield Co-op, thoughts are already on the impact going into fall.
"It's going to be huge, especially with harvest coming on,” said Greg Brockman, an employee at the co-op. “They're pretty much the hub of this area for all kinds of equipment sales and service and parts. Now you're going to have to drive to Hastings or to one of their other stores."
Brockman said Oregon Trail Equipment is a major employer in the area.
"It's an important part of the community here so they're going to try to get up and running temporarily. They're bringing in a double wide and going to try to run out of a small shop along with some shops local farmers are going to loan them so they can get us through harvest," said Franklin.
He said the building was valued at more than $2 million. Multiple combines inside the dealership were also destroyed, according to Franklin.