The association of spiders with witchcraft and evil was also helped by the way spiders live in general. As Pointe Pest Control states, autumn is one of the biggest seasons for spider activity. Spiders tend to propagate more as temperatures fall. Their main source of food, insects, will seek out people's homes and other buildings as shelter from the cold. Because of this, spiders will also end up in houses. Given that Halloween is an autumn holiday, there are probably more spiders present in homes and other buildings around that time of year. 

Aptive Environmental, a pest control company, explains that spiders also love to hide in dark places, such as basements or other nooks and crannies. Given that the habitats of spiders are typically those that humans would find scary or dangerous, this association is made much more naturally. Despite this creepy appearance, most spiders are still generally harmless to most humans, and usually only attack in defense. 

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