Maine has no native spiders considered dangerous to humans. The two species most people worry about, the southern black widow and the brown recluse, are not established in the state. That said, one relative of the black widow does occasionally turn up in parts of Maine, and several common species can deliver bites that cause discomfort.
The Northern Black Widow: Maine’s Only Concern
The northern black widow is the closest thing Maine has to a medically significant spider. According to the University of Maine Cooperative Extension, it may be an infrequent inhabitant as far north as central Maine and into southern Canada. Its range spans much of the eastern United States, from Florida north through New England.
You can distinguish the northern black widow from its more famous southern cousin by the red hourglass on its underside. On the northern species, the hourglass has a visible gap between its top and bottom halves, rather than forming one connected shape. These spiders prefer undisturbed outdoor spots: old stumps, hollow logs, fallen fence posts, abandoned animal burrows, brush piles, and the corners of sheds and crawlspaces.
Encounters are rare. Northern black widows are not aggressive, and bites typically happen when someone accidentally presses against one while reaching into a dark space. A bite can cause significant pain and, in uncommon cases, more serious symptoms that require medical attention.
Brown Recluse Spiders Are Not in Maine
The brown recluse is one of the most frequently misidentified spiders in the northeastern United States. Many people who find a brown spider in their home assume the worst, but the brown recluse’s established range is in the south-central U.S., nowhere near New England. The University of Maine Cooperative Extension notes that misdiagnoses of brown recluse bites are “very common” in the state.
What people typically find are other brown-colored species that look superficially similar but lack the brown recluse’s characteristic violin-shaped marking on its back. If you’re in Maine and you think you’ve spotted a brown recluse, you almost certainly haven’t.
Common Spiders That Bite
Several spiders found throughout Maine can bite if provoked, even though none are truly dangerous. Wolf spiders, fishing spiders, and yellow sac spiders are the most common culprits. These bites usually produce mild, localized reactions: redness, minor swelling, and some pain that resolves within a day or two.
Individual sensitivity varies. Most people experience nothing more than a mosquito-bite-level reaction, but in rare cases, someone with a highly sensitive or weakened immune system can have a more significant response to a bite from an otherwise harmless spider. This variability is part of why spider bites get blamed for all sorts of skin reactions that may actually be caused by something else entirely.
What to Do if You’re Bitten
For any spider bite in Maine, start with basic wound care:
- Clean the area with mild soap and water.
- Apply a cool compress for about 15 minutes each hour to reduce pain and swelling. A clean cloth dampened with cold water or wrapped around ice works well.
- Elevate the area if possible, especially if the bite is on a hand or foot.
- Use over-the-counter pain relief if needed. An antihistamine can help with itching.
Watch the bite over the next few days. If the redness spreads, the wound opens, or you develop signs of infection like increasing warmth or pus, you may need antibiotics. Severe pain, muscle cramping, or symptoms that feel like they’re affecting your whole body (rather than just the bite site) warrant a call to your doctor or a visit to urgent care, particularly if you suspect a black widow was involved.
Keeping Spiders Out of Your Home
Spiders follow their food. If insects are getting into your house, spiders will come in after them. The most effective long-term strategy is reducing both access points and the insect population that draws spiders indoors.
Start with the exterior. Clear woodpiles, rock piles, old boards, and compost away from your foundation. Trim trees and shrubs back far enough to let sunlight and airflow reach the base of your home, since spiders prefer damp, sheltered areas. If you have exterior lights mounted directly on the building, consider switching to post-mounted lights aimed at the house instead. Building-mounted lights attract insects right to your walls, and spiders set up camp nearby. Swapping mercury bulbs for sodium vapor lamps also reduces the insect draw.
Seal cracks and crevices in your foundation and siding. Make sure window and door screens are intact and tight-fitting. Control moisture in basements, crawlspaces, and porches, since dampness attracts both insects and the spiders that hunt them.
Indoors, the vacuum is your best tool. Regular vacuuming of corners, window frames, registers, and vents removes spiders, their webs, and the insects they eat. Don’t let boxes and stored items sit undisturbed for long stretches. Any cluttered, quiet area becomes prime spider habitat. Moving things around periodically and keeping storage areas tidy makes your home far less appealing.
Wear Gloves Around Stored Materials
Most spider bites happen when someone reaches into a space where a spider has been resting undisturbed. Woodpiles, garden sheds, boxes in the basement, and old tarps are classic spots. Wearing work gloves when handling materials that have been sitting for a while is one of the simplest ways to avoid a bite. Shake out shoes, gloves, and clothing that have been stored in garages or sheds before putting them on, especially in warmer months when spiders are most active.