Montana Spiders: Identification, Pictures & Which Bite

Which spiders can hurt you

Official sources single out these spiders in Montana, in their own words:

• 

  Western Black Widow

  Venomous. “It is the only spider, to date, of medical importance in Montana.” Montana State University Extension

• 

  Northern Black Widow

  Neurotoxic bite per 2005 MSU guide. “The bite of both the western and northern black widow is a neurotoxin and is very painful.” Montana State University Extension

• 

  Hobo Spider

  MSU sources disagree. “There is no conclusive evidence that hobo spider venom causes necrosis in humans” Montana State University Extension

• 

  Southern Black Widow

  Venomous. “Venomous spiders found in the United States include the black widow and the brown recluse. These spiders can be dangerous to outdoor workers.” CDC / NIOSH

All 423 spiders and 3 other arachnids on the list

• Hobo Spider Eratigena agrestisNonnative
• Northern Black Widow Latrodectus variolus
• Southern Black Widow Latrodectus mactans
• Western Black Widow Spider Latrodectus hesperus
• A Cellar Spider Psilochorus imitatus
• A Cobweb Weaver Steatoda grandis
• A Crab Spider Mecaphesa californica
• A Dwarf Weaver Stemonyphantes lineatusNonnative
• A Dwarf Weaver Collinsia clypiella
• A Dwarf Weaver Erigone denticulata
• A Dwarf Weaver Pityohyphantes phrygianusNonnative
• A Dwarf Weaver Dismodicus modicus
• A Jumping Spider Phidippus apacheanus
• A Jumping Spider Phidippus octopunctatus
• A Jumping Spider Phidippus texanus
• A Jumping Spider Chalcoscirtus carbonarius
• A Jumping Spider Terralonus mylothrus
• A Jumping Spider Habronattus americanus
• A Jumping Spider Habronattus altanus
• A Jumping Spider Paraphidippus aurantius
• A Jumping Spider Attulus finschi
• A Jumping Spider Sittisax ranieri
• A Jumping Spider Habronattus hirsutus
• A Jumping Spider Habronattus jucundus
• A Jumping Spider Pelegrina insignis
• A Jumping Spider Pelegrina proterva
• A Jumping Spider Pelegrina aeneola
• A Jumping Spider Pelegrina arizonensis
• A Jumping Spider Pelegrina clemata
• A Jumping Spider Pellenes ignifrons
• A Jumping Spider Pelegrina flavipes
• A Jumping Spider Pelegrina montana
• A Leaf-curling Sac Spider Elaver kohlsi
• A Meshweaver Spider Emblyna uintana
• A Meshweaver Spider Mallos pallidus
• A Meshweaver Spider Cicurina gertschi
• A Meshweaver Spider Cicurina peckhami
• A Rock Spider Pimoa jellisoni
• A Running Crab Spider Apollophanes texanus
• A Running Crab Spider Philodromus rufus pacificus
• A Running Crab Spider Philodromus rufus vibrans
• A Running Crab Spider Philodromus aureolusNonnative
• A Sheetweb Weaver Bathyphantes nigrinusNonnative
• A Stealthy Ground Spider Callilepis mumai
• A Stealthy Ground Spider Zelotes subterraneusNonnative
• A Thin-legged Wolf Spider Pardosa ourayensis
• A Thin-legged Wolf Spider Pardosa tetonensis
• A Thin-legged Wolf Spider Pardosa uncata
• A Thin-legged Wolf Spider Pardosa utahensis
• A Thin-legged Wolf Spider Pardosa wasatchensis
• A Wolf Spider Tigrosa grandis
• Abbot's Sac Spider Clubiona abboti
• Aggressive Variegated Sheetweaver Acanthoneta aggressa
• Agile Running Crab Spider Philodromus cespitum
• Agile Running Crab Spider Philodromus pernix
• Alaska Thread Meshweaver Dictyna alaskae
• Alaskan Running Crab Spider Rhysodromus alascensis
• Alberta Backspined Meshweaver Lathys alberta
• Alpine Jumping Spider Chalcoscirtus alpicola
• Alpine Meshweaver Hackmania saphes
• Alpine Tiny Meshweaver Brommella monticola
• American Cellar Spider Pholcophora americana
• American Rockweaver Titanoeca americana
• An Antmimic Spider Castianeira amoena
• An Antmimic Spider Phrurolithus connectus
• An Antmimic Spider Scotinella pelvicolens
• An Arachnid Eremobates scaber
• An Orbweaver Spider Parazygiella montana
• An Orbweaver Spider Cyclosa turbinata
• Angular Hitchhiking Ground Spider Drassyllus lamprus
• Ant Running Crab Spider Thanatus formicinus
• Ant-like Ground Hunter Micaria pulicaria
• Arabesque Orbweaver Neoscona arabesca
• Armoured Antmimic Corinne Spider Scotinella pugnata
• Ash Hahniid Spider Hahnia cinerea
• Asiatic Wall Jumping Spider Attulus fascigerNonnative
• Attractive Running Crab Spider Rhysodromus histrio
• Avid Split Wolf Spider Schizocosa avida
• Banded Garden Spider Argiope trifasciata
• Banded Running Crab Spider Philodromus imbecillus
• Bank Sac Spider Clubiona riparia
• Barn Funnel Weaver Tegenaria domestica
• Beautiful Money Spider Idionella formosa
• Beautiful Ornamented Jumping Spider Habronattus decorus
• Bicolored Armoured Money Spider Ceraticelus fissiceps
• Bident Sheet-web Weaver Diplocentria bidentata
• Bilobed Helmet Money Spider Pelecopsis sculpta
• Blackmarked Jumping Spider Dendryphantes nigromaculatus
• Blocky Preening Ground Spider Zelotes tuobus
• Bog Ground Hunter Gnaphosa parvula
• Bog Sheet-web Weaver Kaestneria pullata
• Bold Tufted Jumping Spider Phidippus audax
• Bordered Orbweaver Larinioides patagiatus
• Boreal Cobweb Weaver Steatoda borealis
• Boreal Ground Crab Spider Xysticus canadensis
• Boreal Jumping Spider Phidippus borealis
• Boreal Laceweaver Amaurobius borealis
• Boreal Long-jawed Orbweaver Tetragnatha extensa
• Boreal Ribbon Meshweaver Emblyna borealis
• Boreal Sac Spider Clubiona furcata
• Boreal Wolf Spider Pardosa uintana
• Bowl and Doily Spider Frontinella communis
• Broad-banded Wolf Spider Hogna frondicola
• Bronze Jumping Spider Eris militaris
• Brotherly Ground Crab Spider Xysticus fraternus
• Brown Dwarf Weaver Ceratinella brunnea
• Brown Ground Hunter Gnaphosa brumalis
• Brown-legged Crab Spider Coriarachne brunneipes
• Brownblack Cobweb Weaver Crustulina sticta
• Buckle's Thin-legged Wolf Spider Pardosa bucklei
• Bunge's Running Crab Spider Thanatus bungei
• Buttonhook Leafbeetle Jumping Spider Sassacus vitis
• California Flattened Jumping Spider Platycryptus californicus
• California Ground Spider Gnaphosa californica
• California Running Crab Spider Philodromus californicus
• Canada Sac Spider Clubiona canadensis
• Carolina Wolf Spider Hogna carolinensis
• Cat-faced Orbweaver Araneus gemmoides
• Chamberlin's Fine Sheetweaver Lepthyphantes chamberlini
• Chamberlin's Running Crab Spider Tibellus chamberlini
• Chamberlin's Simple Ground Spider Haplodrassus chamberlini
• Checkered False Black Widow Spider Steatoda triangulosa
• Colorado Antmimic Ground Spider Micaria coloradensis
• Colorado Running Crab Spider Thanatus coloradensis
• Colorado Thin-legged Wolf Spider Pardosa coloradensis
• Common Flower Crab Spider Mecaphesa celer
• Common Grass Funnelweaver Agelenopsis potteri
• Common Ground Crab Spider Xysticus ferox
• Common House Spider Parasteatoda tepidariorum
• Common Laceweaver Callobius nomeus
• Common Leafbeetle Jumping Spider Sassacus papenhoei
• Common Patterned Antmimic Ground Spider Sergiolus montanus
• Common Pirate Wolf Spider Pirata piraticus
• Common Ribbon Meshweaver Emblyna annulipes
• Common Rockweaver Titanoeca nigrella
• Common Six-spotted Cobweaver Rugathodes sexpunctatus
• Common Thread Meshweaver Dictyna major
• Common Threaded Sheetweaver Microlinyphia mandibulata
• Complicated Sheet-web Weaver Improphantes complicatus
• Conifer Sac Spider Clubiona trivialis
• Contrasted Long-jawed Spider Tetragnatha straminea
• Corkscrew Ribbon Meshweaver Emblyna completoides
• Cross Orbweaver Araneus diadematusNonnative
• Cryptic Tufted Jumping Spider Phidippus cryptus
• Curled Antmimic Ground Spider Micaria utahna
• Dark Armoured Money Spider Ceraticelus atriceps
• Dark-legged Long-jawed Jumping Spider Hentzia palmarum
• Deathstring Orb Weaver Cyclosa conica
• Denticulate Ground Spider Gnaphosa antipola
• Different Cobweb Weaver Theridion differens
• Dispersing Money Spider Collinsia ksenia
• Double-toothed Sheetweaver Saaristoa sammamish
• Dutton's Running Crab Spider Tibellus duttoni
• Dwarf Hairy-legged Money Spider Pocadicnemis pumila
• Dwarf Hitchhiking Ground Spider Drassyllus nannellus
• Earthy Ground Crab Spider Spiracme nigromaculata
• East Coast Antmimic Corinne Spider Scotinella divesta
• Eastern Running Crab Spider Philodromus vulgaris
• Eccentric Ground Crab Spider Xysticus ellipticus
• Elbowed Round-bulbed Jumping Spider Pellenattus shoshonensis
• Elegant Ground Crab Spider Xysticus elegans
• Elongated Long-jawed Spider Tetragnatha elongata
• Emerton's Ground Crab Spider Xysticus emertoni
• Emerton's Wolf Spider Arctosa emertoni
• Enlarged Ground Crab Spider Xysticus locuples
• Ensign Ground Hunter Haplodrassus signifer
• Eurasian Wolf Spider Arctosa perita
• Eurasian Yellowish Sac Spider Clubiona lutescens
• Evans's Running Crab Spider Ebo evansae
• Eye-browed Thick Long-jawed Spider Pachygnatha furcillata
• False Black Widow Steatoda grossaNonnative
• Feathered Money Spider Collinsia plumosa
• Fence Long-legged Cobweaver Theridion murarium
• Festive Ornamented Jumping Spider Habronattus festus
• Fierce Orbweaver Araneus saevus
• Filmy Dome Spider Neriene radiata
• Fine-fringed Ornamented Jumping Spider Habronattus amicus
• Finger Thread Meshweaver Dictyna terrestris
• Flared Thread Meshweaver Dictyna coloradensis
• Flower Jumping Spider Attulus floricola
• Foliage Sheet-web Weaver Microlinyphia pusilla
• Forceps Thin-legged Wolf Spider Pardosa sternalis
• Forest Cobweb Weaver Phylloneta impressa
• Forest Wolf Spider Pardosa xerampelina
• Forked Fine Sheetweaver Lepthyphantes furcillifer
• Fox's Antmimic Ground Spider Micaria foxi
• Fox's Backspined Meshweaver Lathys foxi
• Fox's Barrier Orbweaver Metepeira foxi
• Fratris Ground Hunter Zelotes fratris
• Furrow Orbweaver Larinioides cornutus
• Gaitred Thin-legged Wolf Spider Pardosa altamontis
• Gertsch's Ground Crab Spider Xysticus gertschi
• Gertsch's Triangleweaver Hyptiotes gertschi
• Giant House Spider Eratigena atricaNonnative
• Glacial Hahniid Spider Hahnia glacialis
• Glacier Wolf Spider Pardosa glacialis
• Goldenrod Crab Spider Misumena vatia
• Goshute Comb-tailed Spider Neoantistea gosiuta
• Gosiute Ground Crab Spider Xysticus gosiutus
• Graceful Thin-legged Wolf Spider Pardosa concinna
• Grassland Sac Spider Clubiona mutata
• Great Basin Eared Litter Weaver Cicurina intermedia
• Great Basin Short-legged Sheetweaver Agyneta fratrella
• Great Plains Ground Crab Spider Xysticus acquiescens
• Greater Antmimic Corinne Spider Phrurotimpus borealis
• Green Long-jawed Spider Tetragnatha viridis
• Greenland Wolf Spider Pardosa groenlandica
• Grey Ground Crab Spider Xysticus gulosus
• Grey Sheetweb Weaver Bathyphantes brevipes
• Grooved Ribbon Meshweaver Emblyna phylax
• Hacklemesh Weaver Spider Callobius bennetti
• Hagen's Foldingdoor Tarantula Antrodiaetus hageni
• Hammock Spider Pityohyphantes costatus
• Helpful Ground Crab Spider Xysticus benefactor
• High-headed Hammock Sheetweaver Pityohyphantes alticeps
• Highland Knob-jawed Money Spider Frederickus wilburi
• Hilltop Wolf Spider Arctosa alpigena
• Holarctic Long-legged Cobweaver Theridion hemerobium
• Holm's Whiskered Money Spider Islandiana holmi
• Hooded Hitchhiking Ground Spider Drassyllus niger
• Hook-toothed Money Spider Erigone dentosa
• Hooked Ground Crab Spider Xysticus cunctator
• Hooked Long-legged Cobweaver Theridion petraeum
• Household Fine Sheetweaver Lepthyphantes leprosus
• Hoy's Knobbed Jumping Spider Evarcha hoyi
• Hump-backed Orbweaver Eustala anastera
• Idaho Meshweaver Cicurina idahoana
• Intrepid Cobweb Weaver Enoplognatha intrepida
• Irregular Thin-legged Wolf Spider Pardosa anomala
• Island Sheet-web Weaver Islandiana falsifica
• Johnson's Tufted Jumping Spider Phidippus johnsoni
• Jones's Ribbon Meshweaver Emblyna jonesae
• Kaston's Sac Spider Clubiona kastoni
• Keyserling's Running Crab Spider Philodromus keyserlingi
• Kinsman Patterned Money Spider Grammonota gentilis
• Knobbed Ground Crab Spider Xysticus montanensis
• Koch's Wolf Spider Alopecosa kochi
• Kulczynski's Sac Spider Clubiona kulczynskii
• La Sal Preening Ground Spider Zelotes lasalanus
• Labrador Thin-legged Wolf Spider Pardosa labradorensis
• Lake Pepin Running Crab Spider Ebo pepinensis
• Lapland Jumping Spider Pellenes lapponicus
• Leech's Long-legged Cobweaver Theridion leechi
• Lesser Antmimic Corinne Spider Phrurotimpus certus
• Lesser Joyful Armoured Money Spider Ceraticelus laetabilis
• Lesser Thick Long-jawed Spider Pachygnatha xanthostoma
• Levi's Round-bulbed Jumping Spider Pellenattus levii
• Little Banded Wolf Spider Pardosa modica
• Lobe-toothed Ground Spider Callilepis eremella
• Lonely Wolf Spider Piratula insularis
• Long-bodied Cellar Spider Pholcus phalangioides
• Long-palped Antmimic Corinne Spider Castianeira longipalpa
• Mackenzie's Wolf Spider Pardosa mackenziana
• Majestic Money Spider Scotinotylus majesticus
• Malkin's Highbrowed Cobweaver Dipoena malkini
• Manitoba Ribbon Meshweaver Emblyna manitoba
• Marbled Cobweb Spider Enoplognatha marmorata
• Marbled Orbweaver Araneus marmoreus
• Margaret's Running Crab Spider Apollophanes margareta
• Maria's Ribbon Meshweaver Emblyna mariae
• Maritime Running Crab Spider Tibellus maritimus
• Marked Sheet-web Weaver Helophora insignis
• Marked Wolf Spider Arctosa insignita
• Marvelous Ground Hunter Drassodes mirus
• Mccook's Split Wolf Spider Schizocosa mccooki
• Meadow Dark-eyed Orbweaver Hypsosinga funebris
• Metlakatla Thin-legged Wolf Spider Pardosa metlakatla
• Middling Ground Spider Gnaphosa clara
• Minnesota Split Wolf Spider Schizocosa minnesotensis
• Minute Jumping Spider Talavera minuta
• Missouri Burrowing Wolf Spider Geolycosa missouriensis
• Misty Ground-weaver Spider Megalepthyphantes nebulosus
• Montane Cobweaver Canalidion montanum
• Moss Ground Hunter Gnaphosa muscorum
• Mountain Leopard Spider Pardosa dorsalis
• Mountain Running Crab Spider Thanatus altimontis
• Mountain Sheet-web Weaver Scotinotylus alpinus
• Mournful Ground Crab Spider Xysticus luctuosus
• Mournful Sac Spider Clubiona moesta
• Mulaik's Thin-legged Wolf Spider Pardosa mulaiki
• Mundane Short-legged Sheetweaver Agyneta ordinaria
• Nearby Ground Spider Herpyllus propinquus
• Neglected Ground Hunter Drassodes neglectus
• Nordmann's Orbweaver Araneus nordmanni
• Northern Flower Crab Spider Mecaphesa asperata
• Northern Long-toothed Sheetweaver Drapetisca alteranda
• Northern Orbweaver Aculepeira packardii
• Northern Wolf Spider Pardosa tesquorum
• Oblong Running Crab Spider Tibellus oblongus
• Ohlert's Cobweb Weaver Ohlertidion ohlerti
• Oklahoma Grass Funnelweaver Agelenopsis oklahoma
• Ontario Thin-legged Wolf Spider Pardosa ontariensis
• Orange Orbweaver Araneus iviei
• Ornated Spiny-legged Spider Agroeca ornata
• Painted Cobweb Weaver Theridion pictum
• Pale Money Spider Scotinotylus pallidus
• Pale Thin-legged Wolf Spider Pardosa distincta
• Pale Windscorpion Eremobates docolora
• Pallipes Windscorpion Eremobates pallipes
• Parson Spider Herpyllus ecclesiasticus
• Peatland Sheetweb Weaver Hypselistes florens
• Peppered White-cheeked Jumping Spider Pelegrina galathea
• Pluto Ground Hunter Callilepis pluto
• Polymorphic Long-jawed Cobweaver Enoplognatha ovata
• Post Dwarf Weaver Erigone atra
• Prairie Antmimic Corinne Spider Castianeira alteranda
• Prairie Ornamented Jumping Spider Habronattus cuspidatus
• Prairie Thread Meshweaver Dictyna sancta
• Proszynski's Jumping Spider Evarcha proszynskii
• Protrudent Long-legged Cobweaver Theridion neomexicanum
• Protruding Antmimic Ground Spider Micaria porta
• Punctated Ground Crab Spider Xysticus punctatus
• Puritan Ground Hunter Zelotes puritanus
• Radiantly Sinful Sheetweaver Incestophantes lamprus
• Rainier Fine Sheetweaver Lepthyphantes rainieri
• Raptor Wolf Spider Arctosa raptor
• Rare Ground Crab Spider Xysticus fervidus
• Recumbent Ground Crab Spider Xysticus auctificus
• Red Running Crab Spider Philodromus rufus
• Red-spotted Antmimic Corinne Spider Castianeira descripta
• Redbrown Ground Crab Spider Xysticus pellax
• Reddish Ground Hunter Micaria rossica
• Reddish Running Crab Spider Thanatus rubicellus
• Redlined Wolf Spider Arctosa rubicunda
• Resplendant Running Crab Spider Philodromus praelustris
• Robust Meshweaver Cicurina robusta
• Rock Orbweaver Aculepeira carbonarioides
• Rodeck's Running Crab Spider Philodromus rodecki
• Rowensis Dwarf Weaver Ceraticelus rowensis
• Saccate Notched Ground Spider Drassodes saccatus
• Sad Ground Crab Spider Xysticus funestus
• Sad-faced Hitchhiking Ground Spider Drassyllus saphes
• Saint Money Spider Scotinotylus sanctus
• Sanson's Ornamented Jumping Spider Habronattus sansoni
• Shamrock Orbweaver Araneus trifolium
• Shiny Wolf Spider Pardosa moesta
• Shoreline Wolf Spider Arctosa littoralis
• Short-heeled Thread Meshweaver Dictyna brevitarsa
• Short-scaped Hammock Sheetweaver Pityohyphantes brachygynus
• Short-tongued Ribbon Meshweaver Emblyna peragrata
• Showy Running Crab Spider Philodromus spectabilis
• Sierra Dome Sheetweaver Neriene litigiosa
• Silver Long-jawed Orbweaver Tetragnatha laboriosa
• Sincere Crab Spider Ozyptila sincera
• Sinuous Notched Ground Spider Drassodes gosiutus
• Six-spotted Fishing Spider Dolomedes triton
• Six-spotted Yellow Orbweaver Araniella displicata
• Slender Spiny-legged Spider Agroeca pratensis
• Slow Running Crab Spider Philodromus placidus
• Small Barrier Orbweaver Metepeira grandiosa
• Small Orbweaver Hypsosinga pygmaea
• Small Sheet-web Weaver Microneta viaria
• Small-footed Unloved Money Spider Aphileta microtarsa
• Small-spined Preening Ground Spider Zelotes exiguoides
• Snow Titanoecid Spider Titanoeca nivalis
• Snowbank Wolf Spider Pardosa fuscula
• Solitary Prickly Wolf Spider Acantholycosa solituda
• Spiny-legged Pirate Wolf Spider Pirata sedentarius
• Spinyrib Wolf Spider Alopecosa aculeata
• Spiraled Thread Meshweaver Dictyna arundinacea
• Spiraling Sheet-web Weaver Walckenaeria spiralis
• Spruce-fir Moss Tarantula Microhexura idahoana
• Spurred Variegated Sheetweaver Poeciloneta calcaratus
• Stoned Thin-legged Wolf Spider Pardosa lapidicina
• Striped Orbweaver Larinia borealis
• Striped Patterned Antmimic Ground Spider Sergiolus angustus
• Striped Running Crab Spider Thanatus striatus
• Striped Tufted Jumping Spider Phidippus clarus
• Subarctic Ground Crab Spider Psammitis labradorensis
• Sula Ground Hunter Zelotes sula
• Sundevall's Sheet-web Weaver Maso sundevalli
• Swollen Meshweaver Cicurina simplex
• Talus Tufted Jumping Spider Phidippus purpuratus
• Tenspotted Sheet-web Weaver Dismodicus decemoculatus
• Terrestrial Wide-eyed Sheetweaver Porrhomma terrestre
• Thick-headed Dwarf Weaver Ceraticelus crassiceps
• Thick-spined Jumping Spider Tutelina similis
• Thin-hooked Comb-tailed Spider Neoantistea agilis
• Thin-scaped Hammock Sheetweaver Pityohyphantes kamela
• Three-banded Ground Crab Spider Xysticus triguttatus
• Three-toothed Thread Meshweaver Dictyna tridentata
• Toadstool Thin-legged Wolf Spider Pardosa steva
• Tough Ground Crab Spider Spiracme dura
• Treeline Wolf Spider Pardosa furcifera
• Truncated Thread Meshweaver Dictyna volucripes
• Tuberculated Crab Spider Tmarus angulatus
• Tuffed Dwarf Weaver Erigone cristatopalpus
• Tundra Ground Hunter Micaria constricta
• Turf Wolf Spider Trochosa terricola
• Twister Corkscrew Money Spider Spirembolus spirotubus
• Two-toothed Ground Crab Spider Xysticus bicuspis
• Tyrell's Tufted Jumping Spider Phidippus tyrrelli
• Undergrowth Sheet-web Weaver Oreonetides vaginatus
• Unmarked Comb-tailed Spider Hahnia ononidum
• Unmarked Ground Spider Herpyllus hesperolus
• Utah Crab Spider Bassaniana utahensis
• Utah Funnel-web Spider Agelenopsis utahana
• Versicolor Long-jawed Orbweaver Tetragnatha versicolor
• Victorious Ground Hunter Haplodrassus eunis
• Vigilax Sheet-web Weaver Walckenaeria vigilax
• Walsingham's Antmimic Corinne Spider Castianeira walsinghami
• Wandering Ground Crab Spider Xysticus discursans
• Waneta Shield Sheetweaver Bathyphantes waneta
• West Coast Orbweaver Araneus gemma
• West Coast Running Crab Spider Philodromus insperatus
• Western False Black Widow Spider Steatoda hespera
• Western Ghost Spider Anyphaena pacifica
• Western Hammock Sheetweaver Pityohyphantes cristatus
• Western Immaculate Cobweaver Robertus vigerens
• Western Leopard Spider Pardosa dorsuncata
• Western Long-jawed Cobweaver Enoplognatha joshua
• Western Lynx Spider Oxyopes scalaris
• Western Mountain Ground Spider Orodrassus coloradensis
• Western Patterned Antmimic Ground Spider Sergiolus columbianus
• Western Ribbon Meshweaver Emblyna reticulata
• Western Spiralled Meshweaver Tricholathys spiralis
• Western Triangular Cobweaver Euryopis scriptipes
• White-banded Crab Spider Misumenoides formosipes
• Whitemarked Cobweb Weaver Steatoda albomaculata
• Woodlouse Spider Dysdera crocata
• Woods Sheet-web Weaver Walckenaeria atrotibialis
• Wyuta Long-jawed Cobweaver Enoplognatha wyuta
• Wyuta Thin-legged Wolf Spider Pardosa wyuta
• Yellow Garden Spider Argiope aurantia
• Yellow-striped Laceweaver Arctobius agelenoides
• Zebra Jumper Salticus scenicus

Spiders people confuse

Hobo Spider or Domestic house spider (barn funnel weaver)?

Hobo Spider Venomous

No confirmed photo of Domestic house spider (barn funnel weaver)

Domestic house spider (barn funnel weaver) Not stated

Very similar in color; an arachnologist is needed. Males have one palp prong (hobo: two).

Yellow garden spider or Banded garden spider (banded orb weaver)?

Yellow garden spider Not stated

Banded garden spider (banded orb weaver) Not stated

Missouri Department of Conservation: the banded garden spider is slightly smaller than the black-and-yellow garden spider, with a pointier hind end, and its abdomen has many thin silver and yellow crosswise lines and thicker black, spotty lines.

Photos show typical adults; individuals vary. Never get close to compare.

When spiders are active in Montana

Records of spiders in Montana peak in June to July and September. They show when people record spiders, not how many there are (about month bars).

• Hobo spiders enter homes August to November. Montana State University Extension

If you are bitten or stung

Call 911 or Poison Help at 1-800-222-1222 right away. Poison Help connects you to your local poison center, any time of day.

Official advice from Montana State University Extension:

• Suspected black widow bite: get medical attention. Montana State University Extension

About this list

The species list comes from Montana Field Guide: Spiders, class Arachnida (order Araneae, plus Solifugae) (Montana Natural Heritage Program (Montana State Library) with Montana Fish, Wildlife & Parks: Montana Field Guide, Internet Archive captures 2021-12-03 to 2026-06-16, one per family page (each listed below)). 1 more entry comes from other official sources named on each card.

Venom labels come only from official sources and link to them; "Not stated" never means harmless. How labels work.

"Nonnative" and "Invasive" follow the wording of the source list. See invasive species in Montana.