How to Tell if Your Tarantula Is Molting
If you are uncertain if your pet tarantula is about to molt, this article may help you. Although it is written more for rose-hair tarantulas, many of these steps apply for other species of tarantulas.

1. How is your spider acting? Tarantulas may get lethargic and stop eating before they molt. Some species even change colors!
2. Is your spider moving? Tarantulas often stop moving or don't move at all to conserve energy before a molt.
3. Is your tarantula eating? Before a big molt, tarantulas will stop eating for extended periods of time, ranging from a few weeks to a couple of months.
4. What position is the spider in? During a molt, a tarantula lays up-side down on their back to get out of the old skin easier.