Brown recluse spiders do not live in New Hampshire. Their native range is limited to the central Midwest through the Gulf states, and New Hampshire falls well outside that territory. Despite this, brown recluse “bites” are diagnosed in New Hampshire and across New England with surprising frequency, almost always incorrectly.
Why Brown Recluses Don’t Live in New Hampshire
The brown recluse occupies a well-defined range stretching from roughly Nebraska and Iowa south through Texas and east to Georgia. New Hampshire’s climate and geography sit far outside this zone. While a single spider can occasionally hitchhike into a non-native state inside a shipping box, piece of furniture, or luggage, these lone travelers almost never establish breeding populations. The University of Kentucky’s entomology department notes that infestations “seldom become established” when individual spiders are transported outside their home territory.
So if you’ve moved to New Hampshire from Missouri and you’re worried about bringing one along, the odds of it surviving and reproducing in your new home are extremely low. A stray spider is not an infestation.
Spiders You’re Actually Seeing
Several spiders native to New England get regularly mistaken for brown recluses. The most common lookalikes are long-bodied cellar spiders (the thin, gangly spiders you find in basements and garages), woodlouse spiders (reddish with oversized fangs, found under rocks and logs), and wolf spiders (bulky, fast-moving ground hunters). None of these are medically dangerous in the way a brown recluse is.
If you want to rule out a brown recluse with confidence, look for three features. First, brown recluses have six eyes arranged in three pairs, not the typical eight eyes most spiders have. Second, they carry a dark violin-shaped marking on the front body segment, with the “neck” of the violin pointing toward the back. Third, their legs are uniformly light-colored with no stripes or bands, covered only in fine hairs rather than spines. The body is small, roughly 3/8 of an inch long. Most spiders people suspect are brown recluses fail at least one of these checks.
What’s Really Behind “Brown Recluse Bites” in New England
Thousands of brown recluse bites have been diagnosed in states far outside the spider’s range, from California to New Hampshire, according to UNH researchers. The problem isn’t spiders. It’s misdiagnosis. A range of skin conditions look remarkably similar to a necrotic spider bite, and without actually seeing the spider, even clinicians can get it wrong.
The most common culprit is MRSA, a staph infection that creates red, swollen, painful skin lesions that can blister and break down, closely mimicking what a recluse bite looks like. Boils, furuncles, tick bites, and reactions to topical medications can all produce similar-looking wounds. When a patient shows up with a painful, darkening skin lesion and mentions they saw a spider recently, it’s easy to connect dots that don’t actually connect. The American Academy of Family Physicians has flagged brown recluse bite diagnosis as significantly overused, particularly in regions where the spider simply doesn’t exist.
This matters because the treatment for MRSA is antibiotics, and the treatment for a spider bite is not. A misdiagnosis can delay the right care.
What an Actual Brown Recluse Bite Looks Like
For context, even in states where brown recluses are common, the vast majority of bites are mild. The initial bite is usually painless or causes a mild burning sensation. A small red bump forms, sometimes with a pale center, and in most cases it resolves on its own within about a week.
Skin necrosis, the dramatic tissue death most people associate with brown recluse bites, happens in only 10 to 20 percent of confirmed cases. When it does occur, the lesion darkens over several days, forms a scab-like crust, and eventually opens into an ulcer. Healing takes weeks to months. Severe systemic reactions, including fever, nausea, and anemia, are possible but uncommon, and they develop gradually over days rather than hours.
What to Do if You Suspect a Bite
If you’re in New Hampshire and you think you’ve been bitten by a spider, the most important step is to consider what else it might be. If you didn’t see and capture the spider, a brown recluse bite is statistically almost impossible in your state. Clean the area with soap and water, apply a cool compress for 15 minutes at a time to reduce swelling, and keep the area elevated if you can. An over-the-counter antihistamine or hydrocortisone cream can help with itching.
Seek medical attention if the wound is growing larger, if the surrounding skin turns dark red, purple, or brown, if you develop streaks radiating from the site, or if you notice fever, nausea, or significant swelling. These signs could point to an infection like MRSA that needs prompt treatment. Bringing the spider with you (if you caught it) gives your provider the best chance of an accurate diagnosis.