How long can spiders live without food?


Could a spider outlast you in a starvation showdown? This peculiar question unveils the remarkable survival strategies of these ubiquitous creatures. 

In this exploration, we delve into the extraordinary endurance of spiders, investigating the limits of their survival without food. From the common house spider lurking in your basement to the exotic tarantulas of the wild, each species provides a unique window into the world of arachnid resilience.

Survival span of different spider species


Spiders demonstrate impressive resilience to food scarcity. On average, spiders can survive without food for 30 to 60 days. This ability varies significantly between different species, especially when considering the size of the spider. Larger species like the tarantula can live longer without food compared to smaller house spiders. This is due in part to their larger reserves of body fat and their slower metabolism, which allows them to manage their energy reserves more efficiently over time. 

Fun fact: Tarantulas sometimes refuse food before molting, a behavior that highlights their unique physiological adaptations to their environments.

Baby spiders, surprisingly, also exhibit a strong survival rate without food. Newly hatched spiders are often equipped to survive without immediate feeding, nearly matching the starvation endurance of their adult counterparts. 

Dietary habits and water availability

Understanding a spider’s diet is crucial for comprehending its survival tactics. Spiders are primarily carnivorous, relying on live prey or recently killed insects. Their typical diet in domestic settings includes insects like flies, mosquitos, gnats, ants and moths. However, they are opportunistic feeders and may consume a variety of other insects caught in their webs, such as earwigs, crickets, cockroaches, centipedes and even other spiders.

Beyond their dietary needs, water plays an essential role in spider survival, particularly during periods without food. Access to water can significantly extend a spider's lifespan without food by maintaining physiological processes such as digestion and nutrient management. Efficient metabolism of their reserves is critical for maintaining energy levels and supporting essential functions, (especially when prey is scarce).

Understanding spider hydration mechanisms


Spiders have sophisticated mechanisms for managing hydration that are vital for their survival. They possess an exoskeleton, which while protective, also challenges their ability to retain water. To mitigate this, spiders exhibit remarkable adaptations:

  • Spiracles and setae: Spiders breathe through spiracles on their abdomen, which also regulate water loss. Their bodies are covered with tiny hydrophobic hairs known as setae, which repel water and reduce moisture loss.
  • Oily cuticle layer: Some spider species have an oily layer on their cuticle that further minimizes water evaporation, aiding in hydration retention.

These adaptations prevent dehydration and allow spiders to thrive in diverse environments. Spiders also adjust their behavior to conserve water—staying hidden during hot periods, seeking cooler microenvironments with higher moisture levels and reducing activity during droughts.

Hydration's role in spider physiology

Hydration is not merely about survival; it’s integral to a spider's physiological health. Water plays  three crucial roles: 

  • Facilitates metabolic reactions: Water is crucial for carrying out vital metabolic reactions that are essential for a spider’s survival.
  • Aids in nutrient absorption: Adequate hydration helps spiders absorb nutrients effectively, which is vital for their health and energy.
  • Supports waste elimination: Water plays a key role in waste elimination, preventing the buildup of toxins in the spider's body.

In their natural habitats, spiders utilize various hydration sources like rainwater, dew and moisture from their prey. 

Cannibalism as a survival strategy


In extreme cases of food scarcity, some species of spiders exhibit cannibalistic behavior. Female spiders may consume their offspring, and siblings might eat each other. This grim reality is a survival mechanism, allowing spiders to reduce the number of mouths to feed and ensuring that some can survive to adulthood. 

Research conducted by Susquehanna University suggests that older spiders are less likely to engage in cannibalism compared to their younger counterparts, indicating that age and maturity may play roles in using cannibalism as a survival strategy. 

Fun fact: In a fascinating display of survival, male orb-weaving spiders (from the species Philoponella prominens) can catapult themselves off their mates to avoid being eaten after mating. 

Learn about your local spiders

For those curious about the types of spiders that might be cohabiting in their space, identifying local species can be fascinating and useful. Each species has unique characteristics and behaviors that can impact their interaction with humans. 

Managing spiders in the home

While understanding spiders can lead to a greater appreciation of these creatures, many prefer to keep their homes spider-free. For those looking for a humane and safe method to manage spider populations indoors, consider using non-toxic sprays that are effective yet safe for both humans and pets. 

Taking action

Spiders are remarkable survivors, capable of enduring long periods without food. They are not only masters of survival but also crucial in controlling pest populations. However, we understand that despite their ecological benefits, the presence of spiders in the home is not always desirable.


If you are seeking effective and humane ways to manage these arachnids, Dr. Killigan’s has the perfect solutions. Our Insect Buster Bulb Duster, Dust to Dust Plant-Powered Insect Powder, and Six Feet Under Plant-Powered Insect Spray offer safe and effective options to maintain a spider-free home. We encourage you to visit our website to explore these innovative solutions and equip yourself with the right tools to ensure your living space remains comfortable and free of unwanted guests.

For those intrigued by the fascinating world of spiders and wishing to delve deeper, explore these articles: 

Together, we can appreciate spiders for their roles while keeping our homes serene and secure.

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