Black Widow Spider Eggs

Black widow spider eggs can be found in dark crevices beneath stones and in natural debris such as woodpiles. Barns and other secondary buildings are likely to host these spiders, as well. Black widow spider eggs may also be deposited within neglected materials or animal and rodent nests.

A female black widow spider is capable of accumulating and storing enough sperm within one mating session to last throughout her lifetime. Black widow spider eggs are laid onto small, silken webs shaped like cups. Females seal these cups with more silk, forming egg sacs or cases. These egg sacs are pale gray-white in color and measure 12 to 15 mm in diameter. Each egg sac contains hundreds of eggs and is guarded carefully by the female. Black widow spiderlings, also known as juveniles, emerge within approximately one month.