Spiders Found in Montana: Montana spider identification


Montana is home to a diverse array of spider species, ranging from tiny jumping spiders to large orb-weaving spiders. Spider identification is an important skill for anyone interested in exploring Montana’s natural world, as spiders play important roles in the ecosystem and can also pose a risk to humans. In this blog, we will provide an overview of spider identification in Montana, including common spider families and species, dangerous spiders to be aware of, and tips for identifying spiders in different habitats. We will also cover spider behavior, photography, conservation, and debunking common spider myths and misconceptions. By the end of this blog, you will have a deeper understanding and appreciation for the Montana spider identification.

Identifying Montana Spiders

Identifying spiders in Montana can be challenging, but with some knowledge of their physical characteristics and common families, it can become easier. Spiders can vary greatly in size, color, and shape, but they all share some common features. Here are some key things to look for when identifying Montana spiders:

A. Physical characteristics of spiders:

  • Eight legs
  • Two main body parts: the cephalothorax and the abdomen
  • Usually have eight eyes, but some species have six or fewer
  • Fangs used for injecting venom
  • Silk-producing glands for spinning webs

B. Common spider families in Montana:

  • Orb-weavers (e.g. Araneidae)
  • Jumping spiders (e.g. Salticidae)
  • Wolf spiders (e.g. Lycosidae)
  • Crab spiders (e.g. Thomisidae)
  • Fishing spiders (e.g. Pisauridae)
  • Funnel weavers (e.g. Agelenidae)

C. Tips for identifying spiders:

  • Observe physical characteristics, such as leg length, body shape, and coloration
  • Look for distinctive markings, such as patterns on the abdomen or cephalothorax
  • Use a field guide or online resource for spider identification
  • Take note of the spider’s habitat and behavior, as this can also provide clues for the identification
  • Consider reaching out to a local expert or spider identification group for assistance in identifying difficult-to-identify species.

Dangerous Spiders in Montana

While most spiders in Montana are harmless to humans, there are a few venomous species to be aware of. Here is some information on dangerous spiders in Montana:

A. Overview of venomous spiders in Montana:

  • The black widow spider (Latrodectus hesperus) is the only venomous spider in Montana that poses a serious risk to humans.
  • Brown recluse spiders (Loxosceles reclusa) are not commonly found in Montana, but have been occasionally reported in the state.

B. Identification tips for dangerous spiders:

  • Black widow spiders are black or dark brown in color, with a round abdomen and a distinctive red or orange hourglass marking on the underside.
  • Brown recluse spiders are tan to dark brown in color, with a violin-shaped marking on their cephalothorax.

C. What to do if you are bitten by a dangerous spider:

  • Seek medical attention immediately if you suspect you have been bitten by a black widow or brown recluse spider.
  • Apply a cold compress or ice pack to the bite area to help reduce swelling and pain.
  • Avoid taking any medications without first consulting with a healthcare professional.
  • Try to capture the spider (if possible) and bring it with you to the hospital for identification. This can help determine the appropriate treatment plan.

Common Spiders in Montana

Montana is home to many different species of spiders, some of which are more commonly encountered than others. Here is some information on common spiders in Montana:


A. Overview of common spider species in Montana:

  • Orb-weavers are some of the most commonly encountered spiders in Montana, with several different species present in the state.
  • Jumping spiders are another common group, known for their distinctive eye patterns and active hunting behavior.
  • Wolf spiders are also commonly found in Montana and are known for their large size and hairy bodies.
  • Crab spiders, fishing spiders, and funnel weavers are other groups of spiders that are commonly found in Montana.

B. Identification tips for common spiders:

  • Orb-weavers typically have a round abdomen and spin distinctive orb-shaped webs.
  • Jumping spiders are small and compact, with large eyes and a distinctive pattern on their cephalothorax.
  • Wolf spiders are large and hairy, with long legs and a distinctive eye arrangement.
  • Crab spiders are small and flat, and are often found on flowers, where they blend in to ambush prey.
  • Fishing spiders are large and often found near water, where they hunt for aquatic prey.
  • Funnel weavers spin webs in the shape of a funnel, and typically wait for prey to come to them.

C. Ecological importance of common spiders:

  • Spiders play important roles in Montana’s ecosystems, serving as predators of insects and other small animals.
  • Some spider species are important pollinators, as they feed on nectar and pollen.
  • Spiders also play a role in the food chain, serving as prey for larger animals such as birds and mammals.
  • Overall, spiders are an important part of Montana’s biodiversity and contribute to the overall health and functioning of the ecosystem.

Spiders in Montana Habitats

Spiders in Montana can be found in a variety of habitats, from forests and grasslands to wetlands and deserts. Here is some information on spiders in Montana habitats:


A. Overview of spider habitats in Montana:

  • Spiders in Montana are adapted to a range of different environmental conditions, including temperature, humidity, and substrate type.
  • Different spider species are found in different habitats, with some species being more adapted to dry, arid conditions and others being more adapted to moist, wet environments.

B. Identifying spiders in different habitats:

  • Forest-dwelling spiders in Montana include species such as orb-weavers, wolf spiders, and jumping spiders.
  • Grassland spiders in Montana include species such as crab spiders, wolf spiders, and jumping spiders.
  • Wetland spiders in Montana include species such as fishing spiders, wolf spiders, and orb-weavers.

C. Role of spiders in Montana ecosystems:

  • Spiders play an important role in Montana’s ecosystems, serving as predators of insects and other small animals.
  • In forest habitats, spiders may help to control populations of defoliating insects and other pests.
  • In grassland habitats, spiders may help to control populations of crop pests and other insects.
  • In wetland habitats, spiders may help to control populations of aquatic insects and other small animals.
  • Overall, spiders are an important part of Montana’s biodiversity and contribute to the overall health and functioning of the ecosystem.

Spider Behavior in Montana

Spiders in Montana exhibit a wide range of behaviors, from hunting and foraging to reproduction and social behavior. Here is some information on spider behavior in Montana:

A. Overview of spider behavior in Montana:

  • Spiders in Montana are active hunters, using a variety of strategies to catch prey.
  • Some spiders in Montana are social, living in communal webs and sharing prey.
  • Many spider species in Montana exhibit complex courtship and mating behaviors.
  • Spiders in Montana are also adapted to environmental conditions, such as cold temperatures and high altitudes.

B. Hunting strategies of Montana spiders:

Montana spider identification
  • Jumping spiders in Montana are active hunters that use their keen eyesight to stalk and ambush prey.
  • Wolf spiders in Montana are ground hunters that use their speed and agility to capture prey.
  • Orb-weavers in Montana spin distinctive webs and wait for prey to become ensnared.

C. Spider reproduction and lifecycle in Montana:

  • Montana spiders exhibit a wide range of reproductive strategies, including sexual and asexual reproduction.
  • Male spiders in Montana may engage in elaborate courtship displays to attract mates.
  • After mating, female spiders in Montana may lay their eggs in distinctive sacs or webs.
  • Spider young in Montana may undergo a series of molts before reaching adulthood.

Overall, spiders in Montana exhibit a range of fascinating behaviors and adaptations that make them an important and fascinating part of the state’s ecosystems.


What type of spiders are in Montana?

Montana is home to a diverse range of spider species, including wolf spiders, orb-weavers, jumping spiders, crab spiders, and ground spiders, among others.

Are spiders in Montana poisonous?

While some spiders in Montana have venom, only two species – the black widow and the hobo spider – are considered potentially harmful to humans. However, their bites are rare and typically not lethal.

What is the most common house spider in Montana?

The most common house spider in Montana is the hobo spider. It is often found indoors, particularly in dark and damp areas, but it is not an aggressive spider.


In conclusion, Montana is home to a diverse range of spider species, each with unique physical characteristics, behaviors, and ecological roles. Understanding and identifying these spiders is crucial to appreciate their value in Montana’s ecosystems and protecting them from threats such as habitat loss and pesticide use. Overall, spider identification and appreciation are a vital part of Montana’s natural history and an important aspect of promoting biodiversity conservation.

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