Types of Spiders: Identifying Common Species in Your Home and Yard

Identifying the spider you have found is the first step toward deciding how to respond. Most of the roughly 3,000 spider species found in North America are harmless, but a few deserve caution. This guide covers the most common types of spiders you are likely to encounter in and around your home.

For a broader overview, see our complete guide to spiders.

How to Identify Spiders

Before diving into specific species, here are the key features to examine when identifying a spider:

• Size: Measure the body length, not including legs.
• Color and markings: Note any distinctive patterns, stripes, or spots.
• Eye arrangement: The number and layout of eyes vary by family. Most spiders have eight eyes, but the configuration helps narrow down the species.
• Web type: Orb webs, funnel webs, cobwebs, or no web at all — each points to a different spider family.
• Habitat: Where you found the spider provides important identification clues.

Common House Spiders

Common House Spider (Parasteatoda tepidariorum)

House spiders are the most frequently encountered indoor spiders. They are small, with body lengths of 5 to 8 mm, and typically yellowish-brown with darker markings. They build messy, tangled cobwebs in corners, window frames, and basements. House spiders are completely harmless and actually help control other indoor insects.

Cellar Spiders (Pholcidae)

Cellar spiders have extremely long, thin legs and small bodies. They build loose, irregular webs in dark, damp areas like basements, crawl spaces, and garages. When disturbed, they vibrate rapidly in their webs. Cellar spiders are harmless and consume significant numbers of other pests.

Jumping Spiders (Salticidae)

Jumping spiders are compact, active hunters with the best vision of any spider family. Their large, forward-facing eyes give them an almost curious appearance. They are typically small (6 to 13 mm) and often colorful. Rather than building webs, they stalk and pounce on prey. Jumping spiders are harmless and are often tolerated or even welcomed indoors.

Ground-Dwelling Spiders

Wolf Spiders (Lycosidae)

Wolf spiders are large (up to 35 mm body length), robust, and hairy. They are fast-running ground hunters that do not spin webs. They are often brown or gray with darker markings and have a distinctive eye arrangement with two large eyes on top and two large eyes facing forward. Wolf spiders frequently enter homes in fall. Their bites are not medically significant but can be painful.

Hobo Spiders (Eratigena agrestis)

Hobo spiders are brown, funnel-web builders found primarily in the Pacific Northwest. They are often confused with brown recluse spiders but lack the violin marking. Recent research has downgraded hobo spiders from medically significant to essentially harmless.

Garden and Yard Spiders

Garden Spiders (Argiope spp.)

Garden spiders are large, colorful orb weavers that build impressive circular webs in gardens, between shrubs, and around exterior structures. The black and yellow garden spider (Argiope aurantia) is the most recognizable species. They are harmless and excellent pest controllers.

Orb-Weaver Spiders (Araneidae)

Orb-weaver spiders are the architects behind the classic wheel-shaped webs. This family includes hundreds of species, many large and brightly colored. They are nocturnal web builders and harmless to humans.

Crab Spiders (Thomisidae)

Crab spiders are ambush predators that wait motionless on flowers for pollinating insects. Their front legs extend sideways like a crab. Some species can change color to match the flower they occupy. They are completely harmless to humans.

Banana Spiders (Nephila spp.)

Banana spiders, also called golden silk orb weavers, are large spiders known for their strong, golden-colored webs. They are found in the southeastern United States and are harmless despite their impressive size.

Joro Spiders (Trichonephila clavata)

Joro spiders are large, colorful orb weavers native to East Asia that have recently become established in the southeastern United States. They are spreading northward and can tolerate colder temperatures than many similar species. Despite their large size, they are not dangerous to humans.

Venomous Spiders

Black Widow Spiders (Latrodectus spp.)

Black widow spiders are shiny black with a distinctive red hourglass marking on the abdomen. They build irregular, tangled webs in dark, sheltered areas. Their venom is neurotoxic and bites require medical attention. They are found throughout North America but are most common in southern and western states.

Brown Recluse Spiders (Loxosceles reclusa)

Brown recluse spiders are tan to brown with a dark violin-shaped marking on the cephalothorax. They have only six eyes arranged in three pairs. Their range is limited to the south-central United States. Brown recluse bites can cause necrotic wounds that require medical treatment.

Large Spiders

Tarantulas (Theraphosidae)

Tarantulas are the largest spiders in North America. Native species are found in the southwestern United States. Despite their fearsome appearance, tarantulas are docile and their bites are rarely worse than a bee sting. They are popular as pets.

Identifying Spiders by Their Webs

Spider webs can help you identify species even without seeing the spider itself:

• Orb webs (circular, spoke-and-spiral): Orb weavers, garden spiders
• Cobwebs (tangled, irregular): House spiders, black widows
• Funnel webs (sheet with a funnel retreat): Hobo spiders
• Sheet webs (horizontal, hammock-like): Various sheet-web weavers
• No web: Wolf spiders, jumping spiders, crab spiders

When to Worry

The vast majority of spiders you encounter are beneficial and harmless. Concern is warranted only when you positively identify venomous species inside your home or in areas where you and your family spend time. If you are unsure about identification, capture the spider in a clear container and consult a local extension service, or see our guides on black widow spiders and brown recluse spiders for detailed identification help.

For information on dealing with spiders once you have identified them, read our guide on how to get rid of spiders.

Expert Insights

Spider identification is the cornerstone of my IPM practice. In 15 years as a Board Certified Entomologist, I have identified thousands of spiders for concerned homeowners and pest management technicians. The most common misidentification I correct is homeowners mistaking harmless wolf spiders or grass spiders for brown recluses. Learning to recognize a few key features — eye arrangement, body markings, web type, and geographic range — can help anyone make a basic identification and determine whether professional attention is needed. — Sarah Mitchell, BCE

Sources and References

• University of California Riverside Spider Research
• Burke Museum of Natural History and Culture
• National Pest Management Association (NPMA)
• Ohio State University Extension

Main Causes

Indoor spiders activity reflects two drivers — a hospitable indoor environment and a sufficient supply of insect prey. Spiders enter through gaps under doors, around windows, utility penetrations, and any opening leading to attics, basements, garages, or crawl spaces. Once inside they settle wherever undisturbed corners, low light, and easy prey access converge. Cooler weather pushes outdoor species inside in late summer and fall as they seek mating sites or shelter. The most important upstream driver is the indoor insect population — homes with active fly, gnat, moth, or other pest activity sustain larger spider populations than homes without prey. Cluttered storage areas, accumulated webbing, and outdoor lighting that draws nocturnal insects all amplify the indoor pressure.

Risk and Severity

Most spiders found in and around North American homes pose no medical risk to humans and provide net benefit by reducing other pest populations. Two species warrant medical caution: the black widow, whose venom can produce systemic symptoms including muscle cramping, abdominal pain, and elevated blood pressure; and the brown recluse, whose bite can produce a slowly developing necrotic lesion in a minority of cases. Bites from either species generally respond well to medical care, and fatalities are extremely rare. The far more common spider-related problem is aesthetic — webs, egg sacs, and visible spiders cause distress without medical significance. Risk concentrates in undisturbed storage areas, garages, basements, and outbuildings.

Solutions and Actions

For most spider species the goal is removing webs and reducing prey rather than chemical treatment. Vacuum or sweep down all visible webs weekly, including egg sacs, in garages, basements, attics, eaves, and exterior corners. Reduce indoor insect populations by maintaining screens, sealing entry points, and addressing any active pest issue — fewer insects means fewer spiders. Apply a residual insecticide barrier to the foundation perimeter, around windows and doors, and in eaves to deter newly arriving spiders. For confirmed black widow or brown recluse populations in storage areas, use professional pest control, wear long sleeves and gloves when handling stored items, and shake out shoes and clothing left in garages or basements. Single sightings indoors without webs are usually transient and need no chemical response.

Prevention

Prevention works by reducing indoor prey and limiting entry. Vacuum corners, ceiling angles, undisturbed storage, and basement and garage areas weekly to remove webs, egg sacs, and the dust that supports prey populations. Seal gaps around doors, windows, utility penetrations, and foundation cracks. Address active insect pests promptly because indoor spider populations track prey availability. Switch exterior lights to yellow or warm LED bulbs that attract fewer flying insects, and position outdoor lighting away from doors and windows. Inspect and shake out shoes, gloves, and clothing left in garages, basements, sheds, and storage areas. Trim shrubs and ground cover away from the foundation, and keep firewood and debris stacks at least twenty feet from the structure.

Frequently Asked Questions

How many types of spiders are there?

There are over 48,000 described spider species worldwide, belonging to more than 120 families. In North America alone, approximately 3,000 species have been identified. However, most homeowners encounter only a handful of common species, including house spiders, cellar spiders, wolf spiders, jumping spiders, and orb weavers.

How do I identify a spider I found?

Start by noting the spider's size, color, markings, web type (if any), and where you found it. Check the number and arrangement of eyes if possible. Consider your geographic location, as many species have specific ranges. Online resources, university extension services, and pest management professionals can help with identification.

What are the most common spiders found in homes?

The most common indoor spiders in North America include the common house spider, cellar spider (daddy longlegs), cobweb spider, yellow sac spider, and jumping spiders. In certain regions, brown recluses and black widows may also be found indoors. Most indoor spiders are completely harmless.

What spider has a violin shape on its back?

The violin-shaped marking is the most well-known identifying feature of the brown recluse spider. The violin marking appears on the cephalothorax (head region) with the 'neck' of the violin pointing toward the abdomen. However, other spiders can have similar markings, so violin shape alone is not sufficient for identification — also check for six eyes arranged in three pairs.