Are There Black Widows in Hawaii?
Black widows are present on some Hawaiian Islands, particularly the larger islands such as Oahu and the Big Island. The western black widow is established in warm, sheltered outdoor locations across these islands. Bites remain uncommon because these spiders are non-aggressive and avoid contact. Prompt medical attention makes black widow bite injury manageable.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
Northern Black Widow · Joseph McPhail CC BY
Western Black Widow · Rebecca Ray CC BY
Western Black Widow · Michael Eisen CC BY
- 2
- species recorded
- 38
- GBIF records
- March, July, August
- peak months
Yes, black widows are in Hawaii. Next you'll want:
Verified species, source iNaturalist
2 types of black widows recorded in Hawaii
2 black widow species have a verified observation record in Hawaii, each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
1 of the 2 shown is recorded as introduced to Hawaii rather than native.
- No openly licensed photo yet1
- No openly licensed photo yet2
Counts from verified iNaturalist observations.
Real sighting data, source iNaturalist
45 verified observations on iNaturalist of black widow have been recorded in Hawaii, most often in March, July, August.
When black widow are recorded in Hawaii
Black widows are present on some Hawaiian Islands, particularly the larger islands such as Oahu and the Big Island. The western black widow is established in warm, sheltered outdoor locations across these islands. Bites remain uncommon because these spiders are non-aggressive and avoid contact. Prompt medical attention makes black widow bite injury manageable.
Are they in Hawaii?
Yes, black widows are present in Hawaii, though their distribution varies by island. The western black widow is established primarily on the larger islands including Oahu, the Big Island, Maui, and Kauai. They are less commonly reported on smaller islands, though records suggest their presence on multiple islands. Black widows arrived in Hawaii through maritime trade and have adapted to the islands' warm climate. They thrive in sheltered outdoor locations such as dry areas around structures, under eaves, in storage buildings, and in dense vegetation. They are also found indoors in basements, garages, and storage areas. Black widows are more common in drier regions of the islands than in wet regions. Most Hawaiian residents rarely encounter black widows despite their presence. UnderstandingHawaii wildlifehelps you prepare for possible encounters with island species.
How dangerous is it?
A black widow bite is medically significant and should be taken seriously, but it is rarely life-threatening in healthy adults with prompt medical treatment. The western black widow venom affects the nervous system and causes muscle pain, cramping, and discomfort. Symptoms typically develop within 15 to 60 minutes of a bite. The severity of symptoms varies; some bites deliver minimal venom while others cause considerable pain lasting several hours to days. Children, elderly individuals, and people with heart or respiratory conditions face increased risk of severe reactions. Medical professionals in Hawaii are experienced with black widow bites and can provide effective treatment. Anti-venom and supportive medications are available and highly effective. Most people bitten by black widows recover completely within a few days. Deaths from black widow bites are extraordinarily rare in areas with access to modern emergency medical care. For more on black widow in Hawaii, see ourHawaii black widow guide.
How to recognize one
Black widows are distinctive and easily identified by their appearance. Adult females are glossy jet black with round, swollen abdomens. The defining feature is a bright red, orange, or yellow hourglass mark on the underside of the abdomen. Males are smaller and may be lighter colored, sometimes with red or yellow stripes on the abdomen. The western black widow in Hawaii may occasionally appear slightly smaller or with different coloration variations, but the hourglass mark is always present in adult females. These spiders hide in warm, dark, protected locations such as under eaves, in storage sheds, around dry brush, and in enclosed outdoor structures. They build irregular, sticky webs that serve as both shelters and prey traps. Black widows are non-aggressive and will only bite if accidentally crushed or pressed directly against skin. They do not chase or attack; they hide. You can also browseHawaii wildlife.
What to do if you are bitten or stung
If you suspect a black widow bite in Hawaii, stay calm and act quickly. Gently wash the bitten area with soap and water. Remove any rings or tight bracelets from the affected limb, as swelling may develop. Apply a cold compress to reduce pain and swelling, but do not place ice directly on skin. Elevate the bitten area if possible. Seek medical attention as soon as you can, even if symptoms seem mild initially. Hawaii has good access to medical care and hospitals equipped to handle black widow bites. This is general information, not medical advice; if you are bitten, call Poison Control at 1-800-222-1222, or 911 if symptoms are severe. Medical professionals can provide appropriate medication and support to manage symptoms. Do not attempt home treatment such as cutting the bite, applying tourniquets, or using untested remedies.
How to prevent encounters
Preventing black widow encounters in Hawaii means making your home and yard less attractive to spiders. Clear brush and dense vegetation from around your home, particularly in dry areas. Organize garages, storage sheds, basements, and storage areas to minimize dark corners and undisturbed spaces. Inspect dark areas periodically, particularly under eaves and in corners of structures. Shake out shoes, gloves, and clothing before putting them on or using them, especially items stored in garages or sheds. Wear gloves when handling firewood or working in areas you cannot see clearly. Seal cracks and gaps in building foundations, window frames, and door frames. Reduce outdoor lighting at night or use yellow lights, as regular lights attract insects that serve as prey for spiders. When gardening or working in brushy areas, wear long sleeves and closed-toe shoes. Check your body for spiders after spending time outdoors.
Where in Hawaii and when
Black widows in Hawaii are most established on the larger islands such as Oahu, the Big Island, Maui, and Kauai, particularly in drier regions and lower elevations. They are less common on smaller islands but records indicate their presence. Urban areas and areas with human structures support larger populations because buildings and sheds provide shelter. Hawaii's warm climate allows black widows to be active year-round, unlike populations in colder regions. Activity tends to peak during the warmest months from spring through fall. They remain active during winter months but may retreat into more protected shelter when conditions are less favorable. Elevation affects their presence; higher elevations with cooler temperatures support fewer populations. Coastal and central regions of the larger islands are more likely to have black widow populations than remote or highly elevated areas. Learn more aboutHawaii wildlifeand species distribution.
Harmless lookalikes
Many spiders found in Hawaii are mistaken for black widows, but most are harmless and beneficial. Several native Hawaiian spider species resemble black widows but lack the distinctive hourglass mark and pose no medical threat. Huntsman spiders found in Hawaii can be large and intimidating but are harmless and eat unwanted pests. Common house spiders create dusty webs and are entirely benign. Introduced spiders of various kinds inhabit Hawaiian homes and yards. The most important distinguishing feature is the hourglass mark on the underside of a genuine black widow's abdomen. If you see a black spider without this specific marking, it is almost certainly harmless. Hawaii's native spiders are mostly harmless and provide beneficial predation of unwanted insects. Taking time to identify spiders correctly before assuming danger reduces unnecessary concern.
Frequently Asked Questions
Are black widows deadly? Black widow bites are serious medical concerns requiring professional treatment, but deaths are very rare in healthy adults with prompt care. Modern medicine effectively manages symptoms, and most people recover completely within days. How common are black widow bites in Hawaii? Bites are uncommon despite the presence of black widows because these spiders are non-aggressive and bites occur only from accidental contact. Most encounters result in no bite. What attracts black widows to a house? Black widows seek warm shelter in garages, sheds, and storage areas. They are attracted to the insects they hunt, not to food or water sources. What should I do if I see one? Leave it alone if possible. If removal is necessary, gently sweep it into a container and release it outdoors, or call a pest control professional. Black widows prefer to hide and will not approach you. For more information, exploreHawaii wildlifeguides andour wildlife information.
Plan your trip
Best time to see black widow in Hawaii: March, July, August
See the month-by-month sighting calendar.
Plan your black widow sighting in Hawaii
38 verified black widow records have been logged in Hawaii, most recently in 2026. See the GBIF records.
Where to look in Hawaii
- Ala Kahakai National Historic Trail · Wildlife Watching, Birdwatching · Find hotels
- Hawaiʻi Volcanoes National Park · Wildlife Watching, Birdwatching · Find hotels
- Kaloko-Honokōhau National Historical Park · Wildlife Watching, Birdwatching · Find hotels
- Puʻuhonua o Hōnaunau National Historical Park · Wildlife Watching, Birdwatching · Find hotels
- Puʻukoholā Heiau National Historic Site · Wildlife Watching · Find hotels
- Haleakalā National Park · Find hotels
Frequently asked questions
Are they in Hawaii?+
Yes, black widows are present in Hawaii, though their distribution varies by island. The western black widow is established primarily on the larger islands including Oahu, the Big Island, Maui, and Kauai. They are less commonly reported on smaller islands, though records suggest their presence on multiple islands. Black widows arrived in Hawaii through maritime trade and have adapted to the islands' warm climate. They thrive in sheltered outdoor locations such as dry areas around structures, under eaves, in storage buildings, and in dense vegetation. They are also found indoors in basements, garages, and storage areas. Black widows are more common in drier regions of the islands than in wet regions. Most Hawaiian residents rarely encounter black widows despite their presence. UnderstandingHawaii wildlifehelps you prepare for possible encounters with island species.
How dangerous is it?+
A black widow bite is medically significant and should be taken seriously, but it is rarely life-threatening in healthy adults with prompt medical treatment. The western black widow venom affects the nervous system and causes muscle pain, cramping, and discomfort. Symptoms typically develop within 15 to 60 minutes of a bite. The severity of symptoms varies; some bites deliver minimal venom while others cause considerable pain lasting several hours to days. Children, elderly individuals, and people with heart or respiratory conditions face increased risk of severe reactions. Medical professionals in Hawaii are experienced with black widow bites and can provide effective treatment. Anti-venom and supportive medications are available and highly effective. Most people bitten by black widows recover completely within a few days. Deaths from black widow bites are extraordinarily rare in areas with access to modern emergency medical care. For more on black widow in Hawaii, see ourHawaii black widow guide.