Are there swarms/schools of tarantulas in Nevada?

i saw a swarm cross I 8 in Az in the middle of the night once ..... it was pretty amazing.. I lived in Vegas for a few years and never saw one tarantula in town... they are out in the desert but you dont have much to worry about....they are nocturnal and usually only come out at night and avoid ppl ... one year we can swarmed by crickets there