Full Grown Mexican Black Kingsnake: Size, Lifespan, Price & More

The Mexican black kingsnake is a beautiful, non-venomous snake species that makes a great pet for experienced reptile owners. In this comprehensive guide, we'll cover everything you need to know about caring for a fully grown Mexican black kingsnake.

Size at Full Growth

Mexican black kingsnakes reach their full size between 3-4 years of age. On average, a fully grown Mexican black kingsnake will be:

• Length: 3-5 feet
• Height: N/A (snakes are measured in length)

Females tend to be slightly larger than males. The maximum size recorded for this species is around 6 feet, but most pet kingsnakes only reach 3-4 feet at full growth.

Weight at Full Growth

Corresponding to their length, the average weight of a fully grown Mexican black kingsnake is:

• Males: 0.5-1 lb
• Females: 1-2 lbs

Appearance at Full Growth

At full size, the Mexican black kingsnake retains its distinctive black and white banded color pattern. The bands may fade slightly with age but remain clearly defined. Their scales have a smooth texture and their bodies are slender yet muscular.

Personality at Full Growth

Personality-wise, Mexican black kingsnakes mellow out significantly after reaching adulthood. As juveniles they can be nippy, but fully grown snakes are remarkably docile.

With regular handling, they become accustomed to people and don't view hands as food objects. Their curious nature remains, making them enjoyable pets to observe.

Price of a Full Grown Snake

You can expect to pay the following for a fully grown Mexican black kingsnake:

• $75-150 for a pet quality snake from a breeder
• $150-300 for a high quality snake meant for breeding

Rescued/rehomed adults may cost less. Prices vary depending on the snake's gender, size, and quality.

Food and Feeding

At full size, here is what you need to know about feeding a Mexican black kingsnake:

• Diet: Adult rats, approximately one rat every 5-10 days.
• Feeding method: Pre-killed rats should be left in the enclosure for the snake to find on its own.

Monitor their weight and body condition. Slowly increase or decrease feeding frequency as needed to maintain a healthy shape.

Lifespan

With high quality care, the average lifespan of a Mexican black kingsnake in captivity is 15-20 years. Some kingsnakes have been known to live over 25 years.

Health at Full Growth

Some health considerations for fully grown Mexican black kingsnakes include:

• Obesity - Avoid overfeeding to prevent weight gain.
• Arthritis - Joint issues can develop, so provide substrates that don't stress joints.
• Mites - Check for mites during shed cycles and treat promptly if found.

Regular vet checks are recommended once snakes reach maturity to monitor weight and check for any developing health problems.

Care and Nutritional Needs

This is the minimum care and husbandry a grown Mexican black kingsnake requires:

• Enclosure: 20-30 gallon long tank or larger
• Temperature: 88°F basking spot, 80°F cool side
• Hydration: Fresh water at all times, mist enclosure 1-2x week
• Substrate: Aspen shavings or paper towels for easy cleaning
• Hides: At least two snug hides (warm/cool)
• Decor/furniture: Branches for climbing and shedding
• Cleanliness: Spot clean poop, full cleanup 1x week

As covered earlier, feed pre-killed adult rats of appropriate size every 5-10 days. Supplement calcium and vitamins as needed. Handle 1-2x week so snakes remain tame and used to human interaction.

Estimated Costing of Care

Here's a breakdown of estimated annual costs to care for an adult Mexican black kingsnake:

• Enclosure: $80-150 (if needing an upgrade)
• Bedding: $30-50 per year
• Heating/lighting: $30-50 per year
• Food: $60-100 per year
• Vet bills: $50-100 per year (for annual exams)
• Supplements: $15-30 per year
• Total estimated annual costs: $275-510

These are averages - your actual costs may vary depending on the equipment you already own and unforeseen veterinary expenses.

Possible Behavior Changes

Aside from mellowing out, here are some other behavioral shifts you may notice as a Mexican black kingsnake reaches full maturity:

• Less active exploring, more routine hiding/basking patterns
• Less susceptible to stress from handling compared to when young
• May become more or less food-responsive depending on the individual
• Subtle or no changes in many cases once comfortable in enclosure

Notable Characteristics at Full Growth

Some distinctive traits of mature Mexican black kingsnakes include:

• Bold, high contrast black and white banding pattern
• Shiny, jet black color that seems to change in different lighting
• Inquisitive nature and tendency to stay active even as adults
• Remarkably docile temperament for a rear-fanged colubrid snake
• Slender yet sturdy muscular body from constant foraging/moving

Should You Get One?

In conclusion, the Mexican black kingsnake can make a good pet for experienced reptile owners looking for an attractive, docile snake. Just be prepared for the long lifespan and costs of proper care as the snake reaches adulthood. Their calm demeanor and interesting bands are sure to provide enjoyment for years to come.