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.
Colorado Division of Wildlife spokeswoman Jennifer Churchill said rattlesnake reports remain about the same in the state every spring and summer, and the division hasnât seen a spike in activity or reports this year. The snakes like to bask in the open when temperatures are between 50 and 80 degrees.