Molting Guide

What molting is

A mantis grows by shedding its exoskeleton — the entire outer shell, including eye coverings, leg sheaths, and mouthparts. The new exoskeleton underneath has been forming for the previous instar. To molt, the mantis hangs upside-down from a perch, splits the old exoskeleton along the back, and pulls itself out — head and limbs first, then the abdomen.

It looks the way a snake’s shed looks but in three dimensions. Done well, the molt completes in 15–60 minutes. Done badly, the mantis is permanently damaged or dies.

A typical mantis molts 6 to 8 times between hatching and adulthood. Each molt is a critical event. If you’re a new keeper, start with our getting started guide before your first molt.

Premolt signs

Catch premolt early so you can stop feeding and minimize disturbances.

Strong signs:

• Refusal of prey for 24+ hours in an animal that was eating fine before. This is the single most reliable indicator.
• Hanging upside-down from a perch for hours. Especially if previously the animal favored vertical or horizontal positions.
• Reduced movement overall. Premolt mantises become still.

Subtler signs:

• Abdomen pulled close to the body. The abdomen looks shorter and more compact than usual.
• Color shift. Some species (Orchid most dramatically) become noticeably paler in premolt.
• Slight darkening at limb joints as the new exoskeleton becomes visible through the old.
• Glazed-over eyes. The eye coverings begin separating; eyes look slightly cloudy.

If you spot any of these in combination, treat the animal as in premolt and stop feeding immediately.

Pre-molt enclosure setup

Once you suspect premolt, check the enclosure has what the molt needs:

1. Vertical hanging space. The mantis must be able to hang upside-down with at least 3× its body length of clear space below it (4× for wide-pronotum species like Dead Leaf and Double Shield). This is the single most important physical requirement.
2. A solid perch under the lid. Mesh tops are ideal; if your top is solid, glue or tape a horizontal twig directly under the lid for the mantis to hang from.
3. Adequate humidity. Bump humidity slightly — 5–10% above the species’ baseline range. Mist the enclosure walls (not the mantis) once.
4. No live prey in the enclosure. Remove all uneaten flies/crickets. Chewing feeders like crickets or roaches will sometimes gnaw on a vulnerable molting mantis; flies are harmless but should still be removed so they don’t disturb it.
5. Low traffic. Don’t open the enclosure, don’t tap the walls, don’t move the enclosure to a different shelf.

During the molt

When the molt actually starts:

• The mantis splits the exoskeleton along its back.
• It pulls slowly out, head and front limbs first.
• Then the rear limbs and abdomen.
• The fresh mantis hangs from the empty exoskeleton (still attached to the perch) for 20–60 minutes while the new exoskeleton hardens enough to support it.
• Eventually it climbs back up and orients normally.

Do not interfere. Even if it looks like the mantis is struggling, do not reach in unless the molt has visibly failed (see below).

The post-molt phase — the next 6–12 hours — is the most fragile period. The new exoskeleton is rubbery and any deformation in this window becomes permanent. Hands off.

Failed molts

A failed molt (also called a mismolt, or a mantis stuck in molt) is one where the mantis cannot fully extract itself from the old exoskeleton, or where limbs come out kinked or bent. For a deeper troubleshooting walkthrough, see our guide to praying mantis molting problems.

Causes (in order of frequency):

1. Insufficient hanging height. The most common cause. Limbs can’t fully extend.
2. Insufficient humidity. The new exoskeleton dries too fast and locks in mid-molt.
3. Disturbance during molt. Vibration, handling, or live prey attacking the mantis mid-molt.
4. Poor nutrition. Underfed mantises can fail molts due to insufficient energy reserves.

What to do:

• Stuck in old skin, partially extracted: The mantis may be able to complete the molt with humidity assistance. Mist heavily, wait. Do not try to pull the old skin off — you will tear limbs.
• Kinked limbs after a completed molt: The animal is alive but cosmetically damaged. If it can still walk, perch, and feed, it will live a normal lifespan. Resume feeding 48 hours post-molt.
• Folded wings on a final-molt adult: Wings won’t unfold properly if the molt happened in tight quarters. The animal cannot fly but can otherwise live normally. Females can still breed.
• Death during molt: Sad but common. Note the cause (height? humidity? disturbance?) and prevent it next molt.

Post-molt care

In the first 24 hours after a successful molt:

• No feeding. The fresh exoskeleton and forelegs are still soft, so the mantis cannot reliably grip or subdue prey.
• No handling. Period.
• Light mist. Mist the enclosure walls but not the mantis directly.
• Observe from a distance. Confirm the mantis is moving normally and orienting itself.

After 24–48 hours, resume feeding. Start with a slightly smaller-than-normal prey item — the mantis’s strike speed is slightly reduced for the first few days post-molt.

The final molt

The molt from the last nymph instar to adulthood is the riskiest of them all. Adults are larger, the wing surfaces have to fully unfold, and there’s no second chance — a botched final molt is permanent.

Maximize success:

• Use the largest enclosure the animal will ever need before the final molt
• Confirm hanging height is generous (4× body length for safety)
• Bump humidity slightly during the premolt period
• Don’t move the enclosure during premolt or molt

After a successful final molt, the new adult will rest for 24–48 hours, then start eating and (if female) producing pheromones. Mating can begin 14+ days post-final-molt; do not pair earlier.

Quick reference

• Premolt detected: stop feeding, remove prey, check height + humidity, leave alone.
• Molt in progress: absolute hands off.
• Post-molt 0–24h: absolute hands off.
• Post-molt 24–48h: light mist, observe, no food.
• Post-molt 48h+: small prey, normal husbandry.