Brrrrr, It’s getting cold out there and the spiders are trying to find a warm spot to spend the winter. Most of the spiders are completely harmless, even beneficial, just creepy. Hobo spiders are the exception. Their bite causes a wound that takes a long time to heal. The bite of the Hobo spider (tegenaria agrestis) has been mistakenly identified as being a bite from the Brown Recluse, but that spider does not live in Idaho.