Up to 3 months
Refrigeration at 45-50°F (7-10°C) puts mealworms into a dormant state, significantly extending their lifespan. In the fridge, they can survive for up to 3 months without food or water. This cold temperature slows their metabolism, preventing them from pupating and keeping them in the larval stage longer than room temperature storage.
Storage conditions
- Temperature: 45-50°F (7-10°C)
- Container: Ventilated container with bedding (oatmeal, bran, or wheat bran)
- Moisture: Add a slice of potato or carrot for hydration
- Duration: Up to 3 months in dormancy
Comparison of storage methods
| Method | Temperature | Lifespan | Activity |
|---|---|---|---|
| Room temperature | 68-77°F (20-25°C) | 2-3 months | Active, feeding, growing |
| Refrigerator | 45-50°F (7-10°C) | Up to 3 months | Dormant, minimal activity |
| Freezer | 0°F (-18°C) | Indefinite (frozen) | Dead, preserved |
Reviving mealworms after refrigeration
To return mealworms to normal activity, gradually warm them to room temperature over 1-2 hours. Remove from fridge and place in a container at 68-77°F (20-25°C). Provide fresh food and moisture. They will become active within a few hours as their metabolism increases with temperature.
Factors affecting fridge lifespan
- Temperature fluctuations: Consistent cold extends dormancy
- Moisture levels: Too dry causes dehydration; too wet promotes mold
- Oxygen: Ventilation prevents suffocation
- Initial health: Stronger larvae survive longer in dormancy