Chaco Golden Knee Tarantula Care Guide
- Scientific name: Grammostola pulchripes
- Common name: Chaco Golden Knee Tarantula
- Adult leg span: 7–8 inches
- Lifespan: Females 20–30+ years; males 5–7 years
- Origin: Gran Chaco region of Argentina, Paraguay, and Bolivia
- Type: Terrestrial, New World
- Difficulty: Beginner
The Chaco Golden Knee (Grammostola pulchripes) is one of the most beginner-friendly tarantulas available. Known for its docile temperament, striking golden-banded legs, and exceptionally slow growth rate, it is a long-lived species that rewards patient keepers with decades of companionship.
Species Overview
Grammostola pulchripes originates from the dry grasslands and scrublands of the Gran Chaco region spanning Argentina, Paraguay, and Bolivia. It is a terrestrial, fossorial species that may use or modify existing burrows rather than digging extensively. Adults reach a leg span of 7–8 inches and are among the largest New World tarantulas. Females routinely live 20–30+ years; males typically 5–7 years.
Its calm disposition and generally relaxed temperament make it one of the most recommended first tarantulas, and its striking appearance makes it a standout display species at any experience level.
Quick Reference
| Parameter | Recommended Range |
|---|---|
| Adult Size | 7–8 inches (leg span) |
| Lifespan (Female) | 20–30+ years |
| Lifespan (Male) | 5–7 years |
| Temperature | 72–80°F (22–27°C) |
| Humidity | Mostly dry with moisture gradient |
| Feeding (Adult) | Every 7–14 days |
| Enclosure Type | Terrestrial |
| Experience Level | Beginner |
Enclosure
Use a terrestrial enclosure with more floor space than height. Juveniles do well in small deli cups or 2–5 gallon setups; adults need at least a 10-gallon equivalent (roughly 18" × 12" footprint). Cross-ventilation — side and top vents — prevents stagnant air without drying the enclosure too aggressively. Avoid tall enclosures, as a fall from height can be fatal.
See our guide to the best tarantula enclosures for specific product picks.
Temperature
Maintain ambient temperatures between 72–80°F (22–27°C). Room temperature in most homes is sufficient year-round. Supplemental heating is rarely needed unless your home drops below 68°F. Avoid heat mats placed under the enclosure, as they can overheat the substrate and drive the spider to the surface. A reliable thermometer helps you monitor conditions. See our best tarantula thermometers guide.
Humidity
Like many Grammostola species, the Chaco Golden Knee does well in a mostly dry enclosure with access to a slight moisture gradient rather than a specific humidity percentage. Overflow one corner of the water dish every couple of weeks and allow the rest of the substrate to remain dry. This gives the spider the choice to seek moisture without creating a damp environment that promotes mold or bacterial growth.
Substrate
Use 4–6 inches of substrate to allow burrowing behavior. A mix of coconut fiber (coco coir) and organic topsoil works well, with optional additions of peat moss for texture. The substrate should hold a burrow shape when compressed but remain dry at the surface. See our picks for the best tarantula substrate.
Hides & Decor
Provide at least one hide — cork bark flats or half-logs work well. Individuals vary in whether they use it, but it should always be available. Decor should be stable and not prone to collapse if the spider burrows underneath. Avoid anything with sharp edges. Browse our recommendations for best tarantula hides and best tarantula decor.
Feeding
Feed juveniles every 7–10 days and adults every 7–14 days. Offer prey no larger than the spider's abdomen — crickets, dubia roaches, and mealworms are all accepted. Remove uneaten prey within 24 hours to reduce stress and prevent complications during molting. Long fasting periods are normal for this species, especially before molts. Healthy Chaco Golden Knees may refuse food for weeks or even months without cause for concern — this is one of the defining characteristics of Grammostola. For feeding tools, see our best tarantula feeding tongs.
Water
Provide a shallow water dish at all times. Use a dish no deeper than the spider's abdomen to allow easy access for drinking. Change water every 2–3 days to prevent bacterial growth. See our best tarantula water dishes for size and material options.
Handling
The Chaco Golden Knee is widely regarded as one of the calmest tarantula species. Most individuals tolerate handling well, though all tarantulas are individuals — always read body language before and during any interaction. Avoid handling during pre-molt or within 2 weeks post-molt while the exoskeleton hardens. Keep sessions short and stay close to the ground or a flat surface.
Molting
Chaco Golden Knees molt infrequently — sometimes only once per year as adults. Signs include reduced appetite, lethargy, and a darkening abdomen. Remove all live prey before a molt begins. Leave the water dish in place so the spider has access to hydration throughout the process. Do not disturb the spider for at least 2 weeks post-molt. See our full tarantula molting guide for details.
Lifespan
Females are among the longest-lived tarantulas in the hobby, routinely reaching 20–30+ years in captivity with proper care. Males have a significantly shorter lifespan of 5–7 years and will typically decline after reaching sexual maturity. Because females live dramatically longer, captive-bred females typically command higher prices than males or unsexed juveniles. Sexing via a shed molt is the most reliable method when purchasing unsexed animals.
Common Health Issues
This species is hardy and rarely ill when kept correctly. The most common issues are dehydration (indicated by a shriveled or sunken abdomen) and failed molts, both usually linked to insufficient moisture access or disturbance during the molt cycle. A shriveled abdomen is a sign to offer water immediately. Long fasting periods are normal and should not be confused with illness. Consult our tarantula diseases & health guide for more.
Is the Chaco Golden Knee Right for You?
The Chaco Golden Knee is an excellent choice if you want a large, striking, long-lived tarantula that is forgiving of beginner mistakes and rarely defensive. Its slow pace and calm nature make it one of the best display tarantulas in the hobby. The tradeoff is patience — this species grows slowly and may go months without eating, which can be unsettling for new keepers. If you enjoy watching active webbing behavior, consider the Green Bottle Blue instead. If you prefer an arboreal species, the Pink Toe is a better fit.
New to tarantulas? Start with our tarantula care guide and are tarantulas good for beginners? overview.
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