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Why Do I See So Many Spiders in Southern California in August?

Spiders are an important part of the ecosystem in every climate except the polar regions. They eat harmful insects and provide food for birds and small mammals. Because of the number of different species and their mating cycle, spiders seem to be everywhere in the summer. Thanks to the diverse climates of the region, Southern California is home to many of these spiders and, in August, from San Diego to Bakersfield to Needles, spiders are everywhere.

Native Vs. Invasive Spiders
- Before the arrival of settlers, there were many native spiders living throughout California. The Mojave desert is home to many species of desert recluses and tarantulas, while the woodlands and hills of Southern California were home to many other breeds of spiders, including the dangerous black widow. But with the arrival of settlers from the East and immigrants from all over the world, other breeds of spiders came to California and adapted well to the climate, living in the homes and gardens of the region. These invasive spiders coexist with the native spiders, making California a haven for the spiders of the world.
Climate
- The climate of Southern California played a major role in the spread of spiders throughout California. The native spiders were already adapted to the climate, while the freeloading invasive species that hitched a ride with settlers and immigrants found comfort in most areas of the state. As the suburban home-and-garden lifestyle evolved, spiders took to the yards and gardens and thrived.
Predator and Prey
- Without ample prey, spiders would not survive even in the most ideal climates. All spiders found in Southern California are predators, eating insects and any other edible being that can get trapped in their webs. The biodiversity of Southern California makes it a veritable cafeteria for spiders. But it is also very friendly for animals that prey on spiders. Without this population control, spiders would overrun the land and create problems by crowding out other species.
Life Cycle
- Spiders seem to be more prevalent in the late summer due to their life cycle. Spiders hatch from their egg sac as winter turns to spring, but they stay in the comfort of the sac until they become tiny spiderlings and can spin a web and move away from the sac. They grow during the spring and summer; by August, they are fully grown and looking for mates. During this time, many female spiders stray outside their web looking to lure males for mating. With the great population and diversity of spiders in Southern California, there is no surprise why spiders seem to be everywhere in August in the region.

Animals & Science