Lightning is getting the blame for starting the more than 20,000 acre blaze.
The fire is burning up desert grass and shrubs in the foothills of the Guadalupe Mountains.
In addition to the big blaze and the heat, firefighters are having to deal with rattlesnakes and prickly vegetation.
Almost 200 firefighters, two helicopters, and three air tankers are battling the blaze.
So far, a quarter of a million dollars has been spent trying to get this grassfire under control.
No injuries have been reported.