Due to high to extreme fire danger, Carlsbad Caverns National Park will implement the following preventative measures beginning on June 24: 

• Fire, charcoal, and propane grills are prohibited
• Smoking is prohibited, except inside personal vehicles 
• Open flames and cooking stoves are prohibited in the backcountry

The increased fire danger is due to prolonged hot, dry, and windy weather. These factors result in extremely dry vegetation that is highly susceptible to even the smallest spark. These measures will be in effect until the fire danger subsides. 

Original source can be found here.