Last updated: May 25, 2026
Llama Gestation Calculator
Creators
Dharmendra SinghReviewers
Creators
Dharmendra SinghReviewers
Quick Answer
Calculate llama and alpaca birthing dates and track pregnancy milestones over 350 days. The formula used is Due Date = Breeding Date + 350 days. The Llama Gestation Calculator predicts birthing dates for llamas and alpacas.
Calculate llama and alpaca birthing dates and track pregnancy milestones over 350 days.
Key Takeaways
- Llama gestation averages 350 days (~11.5 months); alpacas average 345 days
- Camelids are induced ovulators — no estrous cycle, breed any day of the year
- Over 80% of births occur between 10 AM and 2 PM (evolutionary predator avoidance)
- Twins are extremely rare (<0.1%) — virtually always single crias
- The 'spit-off' test at day 7-14 is the first behavioral pregnancy indicator
Creators
Dharmendra SinghReviewers
Creators
Dharmendra SinghReviewers
Formula
Due Date = Breeding Date + 350 days
Where:
- D_{birth}=Expected birthing (cria delivery) date(date)
- D_{breeding}=Date of successful mating(date)
- 350=Average camelid gestation period(days)
Worked Examples
Standard Llama — Classic Gestation
A classic llama bred on January 1, 2026
- 1Breeding date: January 1, 2026
- 2Llama gestation: 350 days
- 3Due date = January 1 + 350 days = December 17, 2026
Huacaya Alpaca — Slightly Shorter
A Huacaya alpaca bred on March 15, 2026
- 1Breeding date: March 15, 2026
- 2Alpaca gestation: 345 days
- 3Due date = March 15 + 345 days = February 23, 2027
Miniature Llama — Shortest Camelid
A miniature llama bred on May 1, 2026
- 1Breeding date: May 1, 2026
- 2Miniature llama gestation: 340 days
- 3Due date = May 1 + 340 days = April 6, 2027
Introduction
The Llama Gestation Calculator predicts birthing dates for llamas and alpacas. Llamas average 350 days (~11.5 months) while alpacas average 345 days. Camelids are induced ovulators — they ovulate in response to mating, not on a regular cycle. This means pregnancy is almost guaranteed from successful breeding. For other livestock calculators, see our mare gestation calculator and cow gestation calculator.
Llama/Alpaca Pregnancy Stages
The 350-day gestation is divided into three trimesters, each with distinct management needs.
- Days 1-120 (Early):
No external signs visible. Ultrasound confirms pregnancy at day 14-21. Female 'spits off' males when pregnant (behavioral pregnancy test). Maintain normal nutrition.
- Days 121-240 (Mid):
Gradual weight gain visible. Maintain body condition score 3-3.5. Continue normal exercise and pasture rotation. Deworm as needed.
- Days 241-350 (Late):
Rapid cria growth — 70% of birth weight gained in final trimester. Increase nutrition 25%. CDT vaccine booster at day 300-320. Move to birthing pasture by day 330.
Gestation by Camelid Type
Different camelid species and varieties have slightly different gestation periods.
| Type | Average (days) | Range (days) | Birth Weight |
|---|---|---|---|
| Classic Llama | 350 | 335-370 | 9-14 kg (20-30 lbs) |
| Miniature Llama | 340 | 325-355 | 7-10 kg (15-22 lbs) |
| Huacaya Alpaca | 345 | 330-360 | 5-8 kg (11-18 lbs) |
| Suri Alpaca | 345 | 330-360 | 5-8 kg (11-18 lbs) |
| Guanaco (wild) | 345 | 330-360 | 8-12 kg (18-26 lbs) |
Signs of Approaching Birth
Camelids give subtle signs before delivery. Most births occur during daylight hours (10 AM - 2 PM).
- 2-4 weeks before:
Udder development, teats swell and fill with colostrum
- 1-3 days before:
Vulva relaxes and elongates, tail lifts more frequently
- Day of birth:
Restlessness, frequent lying down and standing, isolation from herd
- Active labor:
Tail raised, visible straining while standing or lying, cria visible within 30 minutes
- Normal delivery:
20-45 minutes from first visible straining to complete birth
- Post-birth:
Cria should stand within 1 hour, nurse within 2-4 hours
Unlike horses, llamas and alpacas almost always give birth during morning/early afternoon — nature's strategy against predators and cold nights.
Breeding and Confirmation
Camelids have unique reproductive biology that differs from other livestock.
- Induced ovulators:
No regular estrous cycle. Females are receptive (sit for male) when follicle is mature.
- Behavioral pregnancy test:
Bred females 'spit off' (reject) males 7-14 days after breeding if pregnant.
- Ultrasound:
Confirm pregnancy at day 14-21 by veterinarian.
- Progesterone test:
Blood test at day 21+ confirms pregnancy.
- Rebreeding if open:
If female is receptive to male after 7-14 days, she didn't conceive — rebreed.
- Twins:
Extremely rare (<0.1%) — almost always single births (crias).
Nutrition During Gestation
Proper nutrition supports healthy cria development without overconditioning the dam.
- First/second trimester:
Good quality pasture or grass hay is sufficient. Body condition score 3.0.
- Final trimester (day 240+):
Increase feed by 25%. Add camelid-specific pellet supplement.
- Selenium:
Critical in selenium-deficient areas — inject BoSe 30 days before due date.
- CDT vaccine:
Booster at day 300-320 to transfer antibodies to cria via colostrum — see the Merck Veterinary Manual on camelid health for protocol details.
- Avoid:
Overfeeding (causes dystocia from oversized cria), grain-heavy diets, fescue grass (endophyte toxicity).
Quick Reference Card
Llama/Alpaca Gestation — Quick Reference
Quick reference • Llama Gestation Calculator
Due Date = Breeding Date + 350 days (llama) or 345 days (alpaca)Valid range: 330–370 days depending on type
Common Values
⚠ Watch Out
- •Gestation over 370 days = veterinary evaluation needed
- •Birth after 4 PM or in cold weather = monitor cria for hypothermia
- •Cria not standing within 2 hours = intervention needed
- •Cria not nursing within 4 hours = tube-feed colostrum immediately
Pro Tips
- →CDT vaccine booster 30-45 days before due date for colostrum antibodies
- →Spit-off test at day 7: if female rejects male, likely pregnant
- →Ultrasound at day 14-21 for definitive confirmation
- →Plan breeding so births occur in warm months for best cria survival
FAQs
How long are llamas pregnant?
Llamas are pregnant for approximately 350 days (11.5 months), with a range of 335-370 days. Alpacas are slightly shorter at 345 days average. This is one of the longest gestation periods among domestic livestock, shorter only than elephants and some marine mammals.
Do llamas have twins?
Twins are extremely rare in camelids — less than 0.1% of births. Almost all pregnancies result in a single cria (baby). Twin pregnancies typically result in one or both crias being non-viable due to the small uterine space. If twins are detected on ultrasound, veterinary monitoring is critical.
What time of day do llamas give birth?
Over 80% of llama and alpaca births occur between 10 AM and 2 PM (daylight hours). This is an evolutionary adaptation ensuring the cria is dry and standing before cold nighttime temperatures. Births after dark or in bad weather should be monitored closely.
How do I know if my llama is pregnant?
The behavioral 'spit-off' test is the first indicator — a pregnant female will aggressively reject a male 7-14 days after breeding. Ultrasound at day 14-21 provides definitive confirmation. Progesterone blood tests work after day 21. Physical signs (belly growth) aren't visible until 4-5 months.
Can llamas breed year-round?
Yes — camelids are induced ovulators with no estrous cycle. They can be bred any day of the year when a mature follicle is present. Females are either receptive (sit for male) or not. There's no seasonal breeding restriction, unlike horses. However, planning births for warmer months improves cria survival.
What is a cria?
A cria (KREE-ah) is a baby llama or alpaca. The term comes from the Spanish word for 'baby.' Crias are born fully furred, with open eyes, and can stand and walk within 1 hour of birth. They nurse within 2-4 hours and begin grazing grass within 1-2 weeks.
When should I vaccinate my pregnant llama?
Give a CDT (Clostridium perfringens types C & D and tetanus) vaccine booster 30-45 days before the expected due date. This ensures the dam produces antibodies that transfer to the cria through colostrum. The cria's own vaccination schedule begins at 4-6 weeks of age.