Care, Health and Growth, Crested Geckos, Geckos

3 Reasons on Why is My Crested Gecko Not Growing

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by The Pet Engineers


Crested geckos are one of the cutest reptile pets to have – and one reason behind it is how small they can be, especially as babies.

However, if your crested gecko is not showing any growth at all, or if it is growing very slowly, it may sometimes be a cause for concern.

A healthy crested gecko grows at an average of 1 gram per month.

This is just an average value, and it is completely normal for a crested gecko to grow in spurts – some periods of accelerated growth, and some periods of no growth at all, especially in winters.

However, if your crested gecko is over the age of 1 year, and if it is still weighing less than 8 to 10 grams, then there may be something wrong with it.

There are many reasons that may be stopping the growth of your crested gecko or causing it to have stunted growth.

It can be anything ranging from not being housed in a proper cage to deficiency in certain essential minerals in the body.

Do Crested Geckos Grow Slow?

Usually, crested geckos need about two years to grow to complete maturity. At the end of two years, a fully grown, completely mature crested gecko may weigh around 40 grams.

This weight may sometimes vary and your crested gecko may as well just reach up to 35 grams – and that’s okay.

The rate of growth of crested geckos varies from one another. While some may grow faster, some others may need a little extra time to grow.

In fact, even for the same crested gecko, the rate of its growth will vary as it goes through its developmental cycle – from being a baby to being a juvenile, to finally becoming an adult.

A crested gecko in the juvenile stage of its development phase tends to show the fastest growth rate as compared to a baby or an adult crested gecko.

A juvenile crested gecko may grow up to 20 grams in just six months.

While it is impossible to have an accurate measure of whether a particular species of geckos grow fast or slow – as it depends on the individual gecko and a lot of its surrounding factors – the crested gecko does grow a little slower when compared to a leopard gecko.

crested gecko
Fully grown crested gecko

3 Reasons Why Is Your Crested Gecko Not Growing

There are several reasons why your crested gecko may not be showing an expected normal growth.

Your crested gecko may not be eating enough.

If you are a new crested gecko owner and are concerned about the growth of your pet, it may help to check if you’re giving it food every other day or at least 3 times a week.

If for whatever reason, your crested gecko hasn’t been eating for 8 to 10 consecutive days, it may help to consult a vet.

This will help eliminate the root cause of the problem and put your crested gecko back on the normal growth track.

The enclosure settings need to be rechecked.

The first parameter that you need to take care of in the enclosure of your crested gecko is the temperature. Lower than optimal temperatures can impact immunity, digestion, and overall growth of the crested gecko.

In the enclosure of your crested gecko, the ambient temperature should be around 71 to 79 degrees Fahrenheit. You should also provide a cool side in the enclosure with a temperature between 68- and 70 degrees Fahrenheit.

Crested geckos kept in low temperatures will not show much growth. The same goes for other parameters such as humidity and lighting.

For most of the day, the ideal relative humidity of a crested gecko’s tank must be 70% – but remember to drop it to around 50% for a few hours a day to avoid any fungal or bacterial growth.

You can even mist your crested gecko before feeding it to improve its appetite. And while this is an optional step, you can also consider adding a low UVA and UVB bulb in the enclosure.

But remember to turn off the UVB light at night.

Your crested gecko may be getting an incorrect diet.

While it is common to the advice given to most new crested gecko owners that they should rely more on fruits and live insects, this advice may not be completely accurate.

Yes, crested geckos are frugivorous and feast over live insects. But these may not have sufficient or balanced quantities of all the nutrients that are needed by the crested gecko.

It is pertinent to not only use powdered food but also to know and have a proper mixture of the fruits being fed. This is because the Calcium to Phosphorus ratio of the fruits should be roughly 2:1.

Excess phosphorus may hamper calcium absorption and can lead to calcium deficiency.

feeding your crestie
Feeding crested gecko live insects

How Long Does It Take For A Crested Gecko To Get Full Size?

Generally speaking, a crested gecko reaches its full size and maturity at two years. This is however an average approximation.

It depends on various factors such as the enclosure settings, the eating habits, the diet being fed, the presence or absence of stressors in the environment, and the individual traits of the crested gecko itself.

Some crested geckos may attain a full size within a year, while some may take anywhere between 18 and 30 months.

In fact, it is also not uncommon for a crested gecko to have a final growth spurt after 3 or 4 years.

Crested Gecko Growth Chart By Age 

Hatchling1.5 to 2 grams2.5 to 3 inches
Baby (2 months)3 grams 3 to 4 inches
Juvenile (3 months)4 grams3 to 5 inches
Juvenile (4 months)5 grams4 to 6 inches
Juvenile (5 months)7 grams4 to 6 inches
Juvenile (9 months)16 to 35 grams6 to 9 inches
Adult (12 months)35 to 50 grams9 to 16 inches
Adult (18 to 24+ months)35 to 55+ grams9 to 16+ inches

Do Crested Geckos Have Growth Spurts?

It is common for male crested geckos to have a growth spurt. In a general case, crested geckos reach their full maturity by 12 to 24 months of age. They weigh around 25 to 55 grams and can be anywhere between 9 and 16+ inches in size.

And in this stage, it is common for a male crested gecko to be smaller than a female crested gecko of the same age.

However, after 3 to 4 years of age, male crested geckos have a final growth spurt that allows them to catch up with the size of the female crested geckos.

2 Ways on How Can You Make It Grow Faster

A steady growth rate is the best for a crested gecko. In order to keep the growth rate consistent and efficient, make sure that the basics have been taken care of in a proper manner.

Ensure that your crested gecko eats the correct diet in the correct amount.

Don’t let your crested gecko over or undereat. And give a proper diet to your crested gecko that includes a balance of fats, calcium, and other nutrients that are pertinent for its health.

Include gut-loaded insects at least 1 to 2 times a week in its diet.

And keep a check on the feces to ensure there are no worms or parasites due to your crested gecko accidentally eating something it shouldn’t have.

Ensure ambient conditions in the enclosure.

Ambient lighting, humidity, and temperature are important for the healthy and steady growth of your crested gecko.

Moreover, keep the enclosure and the room as calm as possible. Remove all stressors that may act as negative stimuli for your crested gecko, as it can lose its appetite when stressed.


Crested geckos make for cute pets and reach their full size within 12 to 24 months of age. However, this duration may vary depending on a large number of factors.

The key is to have patience and focus on steady, consistent, and healthy growth. By taking care of the basics such as enclosure conditions and diet, your crested gecko will grow in its own time.

The Pet Engineers

A team of pet lovers. We have owned various pets over their years. From dogs to reptiles, etc. Our love of pets, strive to us to create up-to-date and accurate helpful guides on pets.

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