The first units on the scene reported the attached garage was fully engulfed, and the fire had spread to two vehicles in the driveway.
Fire crews battled the blaze in near-zero temperatures.
"The firefighters made an aggressive attack on the fire and were able to contain most the fire damage to the garage and vehicles," Harlem-Roscoe Fire Chief Don Shoevlin said.
A call was put out on the Mutual Aid Box Alarm Systme for tankers because the area has no hydrants.
Smoke detectors had alerted the family where the escaped safely outside when units arrived.
The fire is believed to be caused by a portable heater in the garage.