If your jumping spider has suddenly stopped eating, you might be panicking. Is your pet sick? Is something wrong? Should you be concerned?
Why Is My Jumping Spider Not Eating? Pre-Molt Behavior & Care Guide
The good news: loss of appetite is often a completely normal sign that your jumping spider is preparing to molt. However, appetite loss can also signal other issues ranging from environmental problems to serious health concerns. This comprehensive guide will help you understand why your jumping spider isn’t eating, when it’s normal, when to worry, and exactly what to do.
If your spider has stopped eating and you’re unsure whether it’s pre-molt or a health issue, you’re in the right place.
Why Do Jumping Spiders Stop Eating? (5 Main Reasons)
Jumping spiders refuse food for several different reasons. Understanding which reason applies to your spider is crucial for knowing how to respond.
Reason #1: Pre-Molt Preparation (Most Common – 60-70% of Cases)
When a jumping spider is preparing to molt, they naturally stop eating. This is completely normal and healthy.
Why spiders don’t eat before molting:
- They need energy reserves for the molting process
- Their digestive system slows down
- Instinct tells them: it’s time to hide and prepare
- Prey in the stomach makes molting more difficult
How long before molt do spiders stop eating?
- Typically: 3-7 days before physical molt occurs
- Range: Can be as early as 2 weeks before
- Sign of molting: Accompanied by staying in hammock
Reason #2: Already in Pre-Molt (Your Spider is IN the Hammock)
Once your spider enters their hammock (pre-molt), feeding stops. They may not eat again for 2-3+ weeks depending on how long pre-molt lasts.
Signs your spider is in pre-molt (beyond not eating):
- Staying in hammock for 48+ hours
- Rubbing legs excessively
- Abdomen looks plump/swollen
- Refusing all insects (including favorite prey)
- Occasional exits to drink water
Reason #3: Stressed or Adjusting to New Environment
Jumping spiders are sensitive to environmental changes. A new enclosure, moving the enclosure, or loud noises can cause temporary appetite loss.
Signs of stress-related appetite loss:
- Recently moved enclosure
- Temperature fluctuations
- Humidity too high or too low
- Loud noises or vibrations
- Spends time hiding but NOT in hammock
Unlike pre-molt, stressed spiders usually recover appetite within 3-5 days once conditions stabilize.
Reason #4: Health Issue or Illness
Less common, but jumping spiders can get sick. Illness-related appetite loss looks different from pre-molt.
Signs of potential health problems:
- Lethargy or unusual inactivity
- Difficulty moving or webbing legs incorrectly
- Discoloration or unusual appearance
- Refusing food for 3+ weeks straight (not molting)
- Visible injury or damage
- Abdomen looks shrunken (not plump)
Health issues are rare in captive jumping spiders but can happen.
Reason #5: Overfed or Recently Fed Large Prey
Sometimes spiders simply aren’t hungry. If you recently fed your spider a large cricket or grasshopper, they may refuse food for 3-5 days while digesting.
Normal feeding schedule:
- Feed based on abdomen size, NOT days
- Plump abdomen = Skip feeding
- Skinny abdomen = Feed normally
- After large prey = Skip 2-3 days
How to Tell If Your Spider Is Pre-Molting (NOT Sick)
The key is distinguishing pre-molt appetite loss from other causes. Pre-molt has very specific signs.
The 7 Telltale Signs of Pre-Molt
1. In the Hammock for 48+ Hours: Your spider is hiding in their web hammock, barely moving. This is the #1 sign.
2. Plump/Round Abdomen: The rear end looks noticeably fuller and rounder than usual.
3. Rubbing Legs Excessively: You see the spider grooming and scratching at their legs repeatedly.
4. Refusing ALL Prey: Even favorite insects are ignored. Not picky eating—total refusal.
5. Creating/Strengthening Web: The hammock looks extra thick and densely woven.
6. Acting Skittish: Normally bold spider suddenly jumps at any disturbance.
7. Occasional Exits to Drink: Spider leaves hammock briefly for water, then returns.
Quick Decision Tree: Is Your Spider Pre-Molting?
Answer these questions:
- Is your spider in the hammock for 48+ hours? → YES/NO
- Does their abdomen look plump/swollen? → YES/NO
- Is their behavior otherwise normal (exploring, active)? → YES/NO
If YES to all 3 → 95% certain this is pre-molt. DON’T PANIC.
If NO to any → Could be stress, health issue, or recent feeding. See below.
The Complete Pre-Molt Eating Timeline
Here’s what happens to your spider’s appetite during the molt cycle:
| Timeline | Eating Status | What’s Happening |
| Days 1-5 | Normal eating habits | Spider eats regularly as usual |
| Days 6-7 | Appetite decreases | Spider may pick at food but often refuses it |
| Days 8-14 | Appetite completely stops | Pre-molt begins, spider retreats to hammock |
| Days 15-21+ | Still not eating | Spider in hammock, physically molting occurs (1-4 hours) |
| Days 22-28 | Post-molt hardening | Spider emerges but still can’t eat (mouthparts soft) |
| Days 29-35 | First eating attempt | Spider finally shows interest in food again |
IMPORTANT: Pre-Molt Can Last MUCH Longer
This timeline shows a typical molt cycle. However, some spiders (especially females and older spiders) stay in pre-molt for WEEKS or even MONTHS.
Variations in pre-molt duration:
- Young males: Pre-molt 3-7 days
- Young females: Pre-molt 7-21 days
- Mature spiders: Pre-molt 2-4 weeks or longer
- Some females: Stay in hammock for entire month
“It takes as long as it takes” is the keeper’s motto during pre-molt.
What to Do When Your Spider Stops Eating
IF YOU SUSPECT PRE-MOLT (Best Case Scenario)
Do NOT force feed: Your spider knows they need to stop eating. Trust their instinct.
Remove all feeders: Take out crickets and mealworms immediately. They could harm your molting spider.
Leave flies alone: Fruit flies and bottle flies can stay—they won’t harm your spider.
Mist the enclosure: Spray 1-2 times daily to maintain humidity 70-80%.
Don’t disturb: Avoid handling or moving your spider. They’re vulnerable.
Monitor from distance: Quick flashlight peek is OK—extended observation causes stress.
Wait patiently: Pre-molt can last days to weeks. This is normal.
IF YOU’RE UNCERTAIN (Stress or Other Issue)
If your spider isn’t showing clear pre-molt signs, follow these steps:
1. Check temperature: 75-78°F is ideal. Too hot/cold = stress = appetite loss
2. Check humidity: 70-80% is ideal. Adjust if needed.
3. Check enclosure: Is it crowded? Did you recently move it? Remove stressors.
4. Wait 3-5 days: If stress-related, appetite usually returns within a few days.
5. Offer small prey: Try tiny flies instead of large crickets. Sometimes less intimidating.
6. Don’t panic: Temporary appetite loss (even without molting) is usually fine.
IF YOU SUSPECT HEALTH ISSUES (Rare)
If your spider has NOT eaten for 3+ weeks, shows obvious illness signs, or appears injured:
- Isolate if necessary
- Increase humidity slightly (75-80%)
- Maintain temperature 76-78°F
- Offer tiny prey daily (may refuse, but try)
- Unfortunately, spiders have limited treatment options
- Watch for improvement over 1-2 weeks
Most jumping spider health issues are diet or environment-related, not illness.
When NOT to Worry: Pre-Molt Appetite Loss is NORMAL
This cannot be overstated: Pre-molt appetite loss is one of the most normal things a jumping spider does. Don’t panic.
Normal pre-molt scenarios (DON’T WORRY):
- Spider hasn’t eaten for 3 weeks
- Spider is in hammock for entire month
- Spider completely ignores all prey
- Spider looks skinny but has plump abdomen
- You see minimal movement
All of this is EXPECTED during pre-molt.
When TO Worry: Signs of Real Problems
1. Refusing food for 3+ months with no molting signs: Possible chronic health issue
2. Obvious injury or deformity: Physical damage—may need isolation
3. Shrunken abdomen that stays shrunken: Could indicate starvation or illness
4. Difficulty moving or crawling: Possible neurological issue
5. Visible discoloration or strange appearance: Could be mold or infection
6. Legs held abnormally or curled: Possible dehydration or injury
Feeding Your Jumping Spider AFTER Molt
Once your spider finally starts eating again, there’s a specific approach to follow.
Post-Molt Feeding Timeline
Day of molt (physical shedding): Spider cannot eat
Days 1-3 after molt: Mouthparts still soft, don’t feed
Days 3-7 after molt: Exoskeleton hardening, very hungry, offer small prey
Days 7-14 after molt: Fully hardened, back to normal feeding
Signs Your Spider is Ready to Eat After Molt
Don’t feed based on calendar days. Watch for these behaviors:
- Spider emerges from hammock
- Spider actively explores enclosure
- Spider shows hunting behavior (stalking, pouncing)
- Spider successfully captures and eats offered prey
Once you see hunting behavior, feed immediately. Your spider will be VERY hungry.
What to Feed After Molt
Start small, then increase:
- Days 3-7: Fruit flies or small flies (gentle on soft mouthparts)
- Days 7+: Return to normal diet (small crickets, mealworms)
- Don’t: Offer large prey immediately (too taxing for new mouthparts)
Frequently Asked Questions: Spider Not Eating
Q1: My spider hasn’t eaten for 2 weeks and won’t leave the hammock. Is this normal?
A: Completely normal. This is pre-molt. Your spider may not eat for several more weeks. As long as they have water access and proper humidity, they’re fine.
Q2: Can my spider die from not eating during pre-molt?
A: No. Pre-molt appetite loss is natural. Your spider survives on stored energy. They can go weeks without food during this time. However, if a spider hasn’t eaten for 3+ MONTHS without molting, that’s different—seek help.
Q3: My spider is refusing food but NOT in the hammock. What’s wrong?
A: Could be recent feeding (still digesting), stress from environment change, or adjustment to new enclosure. Give it 3-5 days. If eating resumes, no problem. If not, check temperature and humidity.
Q4: How do I know if my spider is molting vs. dead?
A: A quick, gentle flashlight peek into the hammock answers this. If you see the spider (alive or moving slightly), they’re molting. If the hammock is empty, they’ve emerged. Molting spiders look like they’re dead but they’re not.
Q5: Should I remove the old exoskeleton after molt?
A: No need. Your spider will push it out eventually. If it’s loose, you can remove it after 24+ hours. If stuck in hammock, leave it—spider will handle it.
Q6: My spider ate, then stopped. Is it pre-molt or sick?
A: If recently ate a large meal, probably digesting. If small snack, probably pre-molt starting. The context matters. If spider is in hammock with plump abdomen → pre-molt. If in open with normal abdomen → maybe recent feeding.
Conclusion: Appetite Loss During Pre-Molt is NORMAL
If your jumping spider has stopped eating, your first thought shouldn’t be “what’s wrong?” It should be “is my spider preparing to molt?” Appetite loss is one of the most common and normal behaviors in the jumping spider lifecycle.
The vast majority of jumping spiders that stop eating are simply in pre-molt. They’ll resume eating after the molting cycle completes (which can take 2-4 weeks). Provide the right environment—proper humidity, no disturbances, water access—and your spider will handle the rest through their own evolutionary instincts.
Your job is simple: Stop feeding, increase humidity, don’t panic, and wait patiently. Your spider knows what they’re doing.
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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