How Big Do Mourning Geckos Get?
Mourning geckos reach around 3.5 to 4 inches, which is what makes keeping a colony practical in a modest planted vivarium. The colony grows in number rather than in size.
Published adult size figures
| Figure | Value | Notes |
|---|---|---|
| Adult | Around 3.5-4 in | Very small |
| Build | Slight | One of the smallest geckos kept |
| Group | Several in a modest enclosure | Practical at this size |
Checked September 20, 2026 against the sources at the foot of this page. Where sources differ the range is shown rather than averaged.
Getting there
Small and quickly finished
They reach adult size fast, and the colony grows in number rather than in individual size.
Eggs appear without a male
A colony expands on its own, which is worth planning for rather than being surprised by.
What that size means in practice
A small planted vivarium holds a colony
Their size is what makes group keeping practical. A modest tall planted enclosure supports several animals.
Tiny prey, continuously
At under four inches they need fruit flies and other micro-feeders, which is an ongoing culture commitment.
Common questions
How big do mourning geckos get?
Around 3.5 to 4 inches, making them one of the smallest geckos commonly kept. That small size is why group keeping works in a modest enclosure.
How many mourning geckos fit in a vivarium?
Several in a modest tall planted enclosure, because they are small and social. The practical limit is usually feeding and humidity management rather than floor space.
Will my mourning geckos multiply?
Yes. They reproduce parthenogenetically without a male, so a colony expands on its own. Plan for that rather than being caught out by it.