Common Spiders of Upstate New York: Identification & Risk Guide

Upstate New York's forests, fields, and homes host diverse spiders. Most are harmless; two are medically significant. Here's your field guide.

1. American House Spider (Parasteatoda tepidariorum)

• ID: 5–8 mm, mottled brown/tan, bulbous abdomen, messy cobwebs in corners.
• Habitat: Basements, garages, windows, sheds — everywhere human structures exist.
• Risk: None. Bite rare, mild (bee-sting level).

2. Black Widow (Latrodectus mactans, L. variolus)

• ID: Female 8–13 mm, shiny black, red hourglass on ventral abdomen. Male smaller, brown, harmless.
• Habitat: Woodpiles, stone walls, crawl spaces, under decks, outhouses — dark, undisturbed.
• Risk: Venomous. Neurotoxic (latrotoxin). Pain, cramping, nausea, hypertension. Rarely fatal (antivenom exists). Seek medical care if bitten.

3. Brown Recluse (Loxosceles reclusa) — NOT ESTABLISHED IN NY

• Critical: No breeding populations in New York. Range: Central/Southern US (Kansas to Georgia).
• Occasional hitchhikers in shipments — but cannot survive NY winters.
• Misidentification is rampant. Many "recluse" bites are MRSA, diabetic ulcers, or other spiders.

4. Common Garden Spider / Yellow Garden Spider (Argiope aurantia)

• ID: Large (females 19–28 mm), striking black/yellow abdomen, stabilimentum (zigzag) in orb web.
• Habitat: Gardens, fields, shrubs — webs at knee height.
• Risk: None. Beneficial pest control. Bite rare, mild.

5. Jumping Spiders (Family Salticidae — e.g., Phidippus audax)

• ID: Compact, fuzzy, huge anterior median eyes, jerky motion, curious.
• Habitat: Walls, fences, plants, windows — active hunters.
• Risk: None. Bite if crushed = mild pinch. Actually cute.

6. Wolf Spiders (Family Lycosidae — e.g., Hogna, Tigrosa)

• ID: Large (10–35 mm), brown/gray, striped, eyeshine at night, carry egg sac/spiderlings on back.
• Habitat: Ground hunters — leaf litter, gardens, basements.
• Risk: None. Bite if trapped = bee sting. Maternal care fascinating to watch.

Quick Safety

• Shake out shoes/clothing stored in garage/basement.
• Wear gloves moving firewood.
• If bitten by unknown spider: clean, ice, elevate, monitor. Seek ER if systemic symptoms (cramping, fever, necrosis).
• Black widow = only native medically significant spider in upstate NY.

Know them. Respect them. They eat the bugs you hate.