Permit is needed

Apply online or on premise to a permit lotery. Note there's a quite low chance of winning the permit. Only minority of people get it: by drawing lots. The lots can be bought online in advance or early morning at the information office. 

In the winter the chance is a bit higher. 

May to October are the most bussy/crowded months. 

Limiting the visitor counts is an attempt to prottect the area. There are big fines for accessing without the permit. Rangers watch the area. 

Extreme temperatures

There are tripple digits in Fahrenheit (37 °C or more) during the summer and no shade. 

Two gallons of water recommended. You will get thirsty and dehydrated very quickly. 

GPS is recommended. 

No GSM signal in the area. 

About climate and which month to choose.