If you’re wondering “how long does it take a jumping spider to molt?” you’re not alone. Whether you’re a first-time jumping spider owner noticing your pet has disappeared into their hammock, or an experienced keeper preparing for the molting process, understanding the timeline and what to expect is crucial for your spider’s survival. This comprehensive guide covers everything you need to know about jumping spider molting—from the exact duration of each stage to emergency care if something goes wrong.
What Is Molting? (Why Do Jumping Spiders Molt?)
Molting, also called ecdysis, is the process where a jumping spider sheds its old exoskeleton to reveal a new, larger one underneath. Unlike humans who have an internal skeleton, jumping spiders have an external skeleton (exoskeleton) that doesn’t grow with them. To increase in size, they must periodically break free from this rigid outer shell.
Why molting is essential for your jumping spider:
- Growth: The primary reason spiders molt is to grow larger. Without molting, they would be trapped in their current size forever
- Limb regeneration: If your jumping spider has lost a leg or pedipalp (the small appendages near the mouth), they can regrow it during a molt
- Sense hair replacement: Molting allows spiders to replace sense hairs used for detecting vibrations, sounds, and smelling
- Color and marking changes: Many jumping spiders change their appearance after molting—some dramatically, some slightly, and some barely at all
- Repairing damage: Small injuries and deformities can be corrected during the molting process
How many times do jumping spiders molt?
Jumping spiders typically molt approximately 9 times throughout their lives, with each molt representing a new instar (growth stage). Once they reach maturity (usually around the 8th or 9th instar), they stop molting entirely. This is why adult spiders cannot regrow lost limbs or grow any larger.
How Often Do Jumping Spiders Molt? (Timeline by Species and Age)
The frequency of molting depends on the species, age, and feeding schedule of your jumping spider.
Regal jumping spiders (Phidippus regius) – one of the most popular pet species – typically molt every 3 to 4 weeks when young. However, as they age and approach maturity, the gaps between molts become longer and more unpredictable. Some females have been known to stay in their hammock for an entire month during later instars.
Other jumping spider species have varying molt frequencies:
- Bold jumping spiders (Phidippus audax): Every 2-4 weeks depending on size
- Zebra jumping spiders (Salticus scenicus): Every 3-4 weeks
- Lucas’s jumping spiders (Hentzia mitrata): Every 3-4 weeks
Important: Overfeeding can trigger molts sooner than normal, while underfeeding can delay molting. Neither affects the spider’s overall lifespan, but using your spider’s abdomen size as a feeding guide helps maintain natural molt progression. A plump abdomen suggests your spider is ready to molt, while a skinny abdomen means feeding more frequently.
The Three Stages of Jumping Spider Molting
Understanding the molting process happens in three distinct stages helps you know what to expect and how to care for your spider during this vulnerable time.
Stage 1: Pre-Molt (Duration: 3 Days to 3+ Weeks)
Pre-molt is when your jumping spider is preparing for the molt but hasn’t started the physical shedding yet. During this stage, your spider’s body is building up internal fluid pressure and separating the new exoskeleton from the old one—a process that requires significant energy and water.
Signs your jumping spider is in pre-molt:
- Staying in the hammock for 48+ hours consecutively – This is the biggest indicator. While some spiders naturally hide more than others, a sudden retreat into the web that lasts multiple days usually signals pre-molt
- Rubbing their legs and itching – You may see the spider grooming themselves excessively, scratching at their legs and body
- Acting skittish or fearful – Your normally confident spider becomes nervous and jumps at the slightest disturbance
- Refusing prey – The spider ignores or backs away from food, even their favorite insects
- Plump abdomen – Their rear end looks noticeably fuller than usual
- Working on the hammock – The spider may strengthen and thicken their web, making it denser
- Occasional exits to drink – The spider leaves the hammock briefly to drink water, which they need extra amounts of during pre-molt
What to do if your spider is in pre-molt:
- Remove all feeders immediately. Do not place crickets, mealworms, or other prey in the enclosure. A soft, molting spider makes easy prey, and predators can kill them during this vulnerable period
- Flies can stay. Fruit flies and bottle flies can be left in the enclosure because removing them causes more disturbance than leaving them. The spider is unlikely to hunt them during pre-molt anyway
- Mist daily. Continue misting the enclosure sides 1-2 times per day, aiming as close to the hammock as possible. Morning misting is best because jumping spiders are diurnal (active during the day), and they may have already gone to bed by evening and won’t have a chance to drink the water droplets
- Do not handle. Avoid any unnecessary contact or disturbance
- Continue water availability. Ensure the enclosure has a water droplet or damp surface they can drink from
- Monitor humidity. Humidity should be between 70-80% during pre-molt. Use a hygrometer suspended high in the enclosure, away from substrate and decor, to measure the actual air humidity
Pre-molt timing: Pre-molt can last as little as a few days or as long as several weeks, depending on the individual spider. This is completely normal. Some spiders spend 3 weeks in pre-molt, especially as they approach maturity.
Stage 2: Physical Molt (Duration: 1-4 Hours, But Can Appear Longer)
At some point while hidden in their hammock, your jumping spider will begin the actual molting process. This is the most critical and dangerous stage.
What happens during physical molt:
- The spider cracks its exoskeleton – Starting at the back of the head/carapace, the old exoskeleton develops a crack or split line
- Backward extraction – The spider slowly and carefully eases its body out backward through this crack, gathering its legs beneath them
- The death curl – Once free from the old exoskeleton, the newly-molted spider contracts into a tight ball, almost like a coil or comma shape. This is completely normal and not a sign of death or failure. It looks terrifying if you’ve never seen it, but it’s a vital part of the process
- Expansion with fluid – After a few hours, the spider fills with hemolymph (spider blood) and slowly expands, stretching out all eight legs to their full length and hardening their new exoskeleton
Do I need to do anything if I see my spider molting?
No. Do nothing. This is the most important rule. Your molting spider is as fragile as wet tissue paper. One accidental touch, vibration, or disturbance could be fatal. The spider needs this time to extract themselves completely and expand to full size. Even removing a feeder that wandered too close can stress the spider dangerously.
If you’ve accidentally discovered your spider mid-molt, close the enclosure and walk away. The best thing you can do is observe from a distance and let nature take its course.
Stage 3: Post-Molt (Duration: 3 Days to 2+ Weeks)
After the physical molt is complete, your spider enters the critical post-molt hardening phase. During this time, their new exoskeleton is still soft and vulnerable.
What happens during post-molt:
- Hardening of the exoskeleton – The new outer shell gradually hardens and darkens over several days to a week
- Mouthpart maturation – The spider’s mouthparts (chelicerae) remain soft and cannot function for eating or drinking immediately after molt
- Abdomen expansion – The spider’s rear end continues to swell and stretch as the new exoskeleton hardens
- Resting period – The spider will remain in or very close to their hammock, moving minimally
Timeline for post-molt:
- Days 1-3 after emergence: The spider is still very soft. Some sources suggest waiting a full week before attempting to feed, while experienced keepers sometimes offer small prey after 3-4 days
- End of week 1: The exoskeleton begins hardening noticeably
- Days 7-14: The spider typically hardens fully and is ready to hunt
- Total post-molt duration: Can range from as little as 3-4 days to as long as 2+ weeks, depending on the individual spider and environmental conditions
What to do during post-molt:
- Do not feed until the spider has fully hardened and left the hammock on their own
- Continue misting 1-2 times daily to maintain humidity at 70-80%
- Do not disturb the spider more than necessary
- Watch for emergence – Your spider will leave the hammock when they’re ready. Once they come out actively and start hunting, they’re ready for food
- Feed immediately once hunting resumes – After a molt, your spider has used enormous amounts of energy. They will be very hungry and skinny. Feed them as soon as they’re actively hunting or showing interest in prey
- Remove old exoskeleton (optional) – The shed exoskeleton (the old skin) is usually left in the hammock. There’s no need to remove it; your spider will push it out of their web eventually or you can gently remove it once it’s completely dried out
Important: The exact timing from molt completion to full hardening varies dramatically by individual spider. “It takes as long as it takes” is the motto experienced keepers live by. Trying to force feeding before your spider is truly ready can result in injury or death.
How Long Is Each Stage? Complete Timeline Example
Here’s what a typical molt cycle might look like for a young regal jumping spider:
- Day 1-7: Pre-molt behavior (spider in hammock, not eating, abdomen plump)
- Day 8: Physical molt occurs (usually at night or early morning) – takes 1-4 hours
- Day 9: Spider still in death curl, beginning to expand
- Days 10-14: Exoskeleton hardening, spider still mostly in hammock
- Day 15: Spider emerges from hammock, explores enclosure
- Day 16: Spider shows hunting behavior, actively stalking prey
- Day 17+: Normal feeding resumes
This entire cycle = approximately 2.5-3 weeks total for a young spider
However, the actual molt process itself (the physical shedding) typically takes only 1-4 hours, though it may appear longer if your spider stays curled for several hours during the expansion phase.
Species Variations: Does Molt Timing Differ by Species?
Yes, molt timing can vary between species. However, the general timeline (every 3-4 weeks for young spiders, with pre-molt lasting days to weeks) applies to most commonly-kept jumping spider species.
Factors that affect molt timing within a species:
- Sex: Females sometimes take longer in pre-molt and post-molt stages
- Age/instar: Young spiders molt more frequently than older spiders approaching maturity
- Temperature: Warmer temperatures can speed up molting; cold temperatures slow it down
- Feeding levels: More frequent feeding = more frequent molting
- Humidity: Proper humidity levels support normal molt cycles; dry conditions can cause molting delays or complications
Molting Outside the Hammock: What If Your Spider Molts in the Open?
While rare, some jumping spiders molt outside their hammock, usually when:
- They’re disturbed from their hammock during pre-molt
- They’re in a new enclosure and haven’t settled yet
- Humidity is too low
- The hammock is damaged or inadequate
- Stress or overcrowding
If this happens:
- Do not intervene or help. Even though it looks dangerous, your attempts to “rescue” your spider will almost certainly cause injury
- Observe from a distance to ensure they complete the molt
- Provide proper humidity by misting regularly (aim for 80-85% humidity)
- Wait 24+ hours before feeding because it’s difficult to gauge when the exoskeleton has hardened enough for eating
- Test with small prey (like fruit flies) 24 hours after the molt and watch the spider’s reaction. If they avoid the prey, they’re still too soft. Try again in 24 hours
- Once the spider eats the test prey successfully, they’re ready for normal feeding
Risks of molting outside the hammock: Increased chance of injuries, exoskeleton damage, falls, or getting stuck in the shed skin. While many spiders complete this successfully, it significantly increases the risk of a mis-molt.
What About the Old Exoskeleton (Shed Skin)?
Many new keepers worry about removing the old exoskeleton. You don’t need to remove it.
- In the hammock: If the old exoskeleton is stuck in the hammock, leave it. Your spider will push it out on their own once they’re mobile
- Loose in enclosure: If your spider pushes it out into the open, you can gently remove it after it’s completely dried out (usually 24+ hours later)
- Disposal: Simply discard it or compost it. It’s completely safe
Some keepers like to keep the shed skin to monitor molt size and progression, which is fine. It’s purely a preference.
Molt Problems and Mis-Molts: What Can Go Wrong?
This is where current online resources often fall short. Molt problems are serious and require immediate knowledge.
Problem 1: Deformed Limbs After Molt
A jumping spider may emerge from a molt with a leg pointing the wrong direction, unable to move properly, or clearly injured.
What happens:
- The limb typically self-amputates (the joint nearest the damage cuts off circulation, and the limb drops off days or weeks later)
- In many cases, this doesn’t significantly hinder the spider’s survival or hunting ability (spiders only need 6 of 8 legs to function)
- The limb will usually be regrown during the next molt
What to do:
- Continue normal care
- Monitor the spider to ensure they can still hunt
- Let nature take its course – do not attempt to amputate or “help”
Problem 2: Missing Legs or Pedipalps After Molt
Sometimes a spider emerges from a molt missing one or more legs or pedipalps entirely (not just deformed, but completely gone).
What this means:
- Missing legs: A young spider can regrow missing legs during subsequent molts. Even missing multiple legs, spiders can still hunt and survive with remaining limbs
- Missing pedipalp: This can impact the spider’s ability to handle prey properly. If your spider is struggling to feed after emerging with a missing pedipalp, you may need to help by using tweezers to hold prey for the spider or disabling feeders so they only face easy prey
Critical threshold: A spider that loses 4 or more legs may be unable to successfully molt again and will likely pass away. In this case, you can only provide proper care and hope they recover.
Problem 3: Old Exoskeleton Stuck to the Spider
Sometimes the old shed skin doesn’t come completely free and remains stuck to the newly-molted spider.
Solutions:
- Increase humidity: Raise enclosure humidity to 80-85% through more frequent misting
- Create a humidity chamber: Move the spider to a smaller “ICU” enclosure lined with damp paper towels for 24-48 hours to provide maximum humidity
- Dampen cotton bud: Gently dampen a cotton swab and touch the stuck exoskeleton area to loosen it (be extremely gentle)
- Wait and let nature work: The spider may loosen it themselves as they move around, or it may come free during normal grooming
Worst case: If the exoskeleton is stuck to a limb, the spider may self-amputate that limb. If the stuck skin has caused internal damage, the spider may unfortunately pass away.
Problem 4: Spider Falls from Hammock During or After Molt
If you find your spider on the enclosure floor after molting, especially if they’re still in a death curl:
- Do not move them. Just leave them where they are
- Wait 12+ hours. Let them time to continue expanding and hardening
- Check for movement: After 12 hours, if the spider shows any movement or position changes, they survived the fall
- If no movement after 12+ hours: The spider unfortunately didn’t survive the impact
Prevention: Use soft enclosure bottoms (cork bark, moss, or substrate) rather than hard plastic or glass. If your spider is staying in a hammock, ensure it’s secure and won’t collapse.
How to Prevent Mis-Molts: Proper Molting Husbandry
While mis-molts can happen even in perfect conditions, proper husbandry dramatically reduces the risk.
1. Misting for Humidity (Most Important)
Why it matters: The spider uses fluid to separate the old exoskeleton from the new one. They need extra moisture to extract themselves properly.
How to do it correctly:
- Mist the enclosure 2 times per day during the molt cycle
- Aim as close to the hammock as possible without directly spraying the spider
- Morning misting is best because jumping spiders are diurnal and will be awake to drink
- Evening misting may miss them as they’ll already be tucked into their web for sleep
- Use a fine spray bottle to create water droplets on the sides and decor
- Don’t create standing water that could cause mold
2. Humidity Levels (70-80%)
How to measure correctly:
- Use a digital hygrometer
- Suspend it high in the enclosure away from the substrate and decor
- Ensure there’s plenty of air space around it so it reads the actual air humidity, not humidity right next to wet moss
- Expect natural fluctuations—humidity will go up and down throughout the day, and this is healthy
How to achieve 70-80% humidity:
- Mist 1-2 times daily
- Use a heat mat with thermostat (prevents the enclosure from drying out as heat tends to do)
- Add moss or substrate to the bottom
- Use cork bark and hides that retain moisture
- Avoid overly ventilated enclosures during pre- and post-molt
3. Natural or Bioactive Enclosures Are Ideal
Why: Natural enclosures with live plants, substrate, and moss maintain more stable, naturally higher humidity levels. The soil and plants naturally regulate moisture.
Benefits:
- More consistent humidity without constant manual misting
- Softer landing surface if the spider falls
- More natural behavior and less stress
- Fewer mis-molts in general
If you’re using a basic enclosure:
- Mist more frequently (2-3 times daily during molt)
- Use a temperature-controlled heat mat to prevent humidity loss
- Consider adding a humidity gauge to monitor levels
- Watch for mold and ensure the enclosure doesn’t become waterlogged
4. Temperature Control
- Use a thermostat-controlled heat mat to maintain consistent warmth (around 75-78°F is ideal)
- Proper warmth prevents the enclosure from drying out
- Avoid dramatic temperature fluctuations
- Don’t place the enclosure in direct sunlight or near air conditioning vents
5. Feeding Schedule Management
- Feed on a schedule based on abdomen size, not calendar days
- A plump abdomen = time to skip feeding or feed light
- A skinny abdomen = feed normally
- This natural regulation supports healthy molt cycles
Frequently Asked Questions About Jumping Spider Molting
Q: How long can a jumping spider stay in pre-molt?
A: Pre-molt can last anywhere from 3 days to 3+ weeks. This is normal and depends on the individual spider and environmental conditions.
Q: Is my spider dead if they’ve been in their hammock for a week?
A: Not necessarily. Jumping spiders in pre-molt commonly stay in their hammock for 1-3 weeks. Use a flashlight to look inside the hammock (carefully, without disturbing them) to see if the spider is still there and moving slightly. If you see any movement, they’re alive.
Q: When can I resume feeding after a molt?
A: Once your spider has emerged from the hammock and is actively hunting or exploring, they’re ready to eat. This is usually 7-14 days after the physical molt, but can be as little as 3 days or as long as 3 weeks depending on the spider. The spider will let you know by showing hunting behavior.
Q: Can jumping spiders die during molting?
A: Yes, unfortunately. Mis-molts are a leading cause of death in captive spiders. This is why proper humidity, no disturbances, and appropriate care are so critical.
Q: What humidity do jumping spiders need to molt?
A: 70-80% humidity is ideal. Anything below 60% significantly increases the risk of molting problems. Anything above 85% can promote mold growth.
Q: Do I need to remove my spider from its hammock before molting?
A: No. Leave your spider completely alone. The hammock is actually the perfect place for them to molt safely. Do not disturb, handle, or move them.
Q: Why is my spider rubbing their legs so much?
A: This is a classic pre-molt sign. The spider is preparing their body and creating sensory awareness as their new exoskeleton forms.
Q: Can I use a flashlight to check if my spider is molting?
A: Yes, carefully. A brief flashlight peek into the hammock to confirm the spider is there and alive is acceptable. However, do this sparingly (once every 2-3 days maximum) as it can cause stress.
Summary: The Complete Molt Timeline
For a typical young jumping spider (e.g., regal jumping spider):
- Pre-molt duration: 3 days to 3+ weeks (varies widely)
- Physical molt duration: 1-4 hours
- Death curl and expansion: 2-12 hours after physical molt
- Post-molt hardening: 3-14+ days
- Between molts (average): 3-4 weeks for young spiders; longer gaps as they age
- Total molt cycle: Approximately 3-4 weeks on average
Conclusion
Jumping spider molting is a natural but dangerous process that requires patience, proper husbandry, and a hands-off approach. By understanding the three stages, recognizing the signs of pre-molt, maintaining proper humidity levels, and knowing how to handle potential complications, you can give your jumping spider the best chance at a successful molt.
Remember: when in doubt, do nothing. Your spider’s molting process is guided by millions of years of evolution. Your job is simply to provide the right environmental conditions (humidity, no disturbances, adequate water) and step back. Patience during this time will be rewarded with a healthy, hungry spider ready to hunt once their molt is complete.
Author Profile
- Dr. Alex Carter is a veterinarian who enjoys helping pet owners better understand and care for their animals. Through easy-to-read articles, they share practical advice on pet health, nutrition, behavior, and everyday wellness.
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