However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing, kidney problems (such as change in the amount of urine). This is not a complete list of possible side effects.
They are more active when it is cooler, but they can and do come out of hiding at any time of the day. Here in the desert, Arizona Rattlesnakes can easily overheat and die if they cannot find a cool place to keep themselves cool.
Dangerous snakes appearing in southern Nevada - FOX5 Vegas - KVVU. Dangerous snakes appearing in southern Nevada. The weather is getting warmer. That means rattlesnake season has arrived in the Las Vegas valley. The morning, evening and during the night is when rattlesnakes are typically most active. A rattlesnake can strike fear well before it strikes with its fangs. Most definitely, because I'm petrified of snakes, said hiker Toni Sands.