Track your mare's pregnancy through three trimesters and predict the big day.
Breeding Profile
Gestation Timeline
D-14
Confirm
Ultrasound can confirm pregnancy.
D-25
Heartbeat
First heartbeat visible on scan.
D-40
Fetus
Embryo officially becomes a fetus.
D-60
Hooves
Hooves and internal organs form.
D-150
Growth
Rapid bone and muscle maturation.
D-250
Hair
Mane and tail become visible.
D-300
Lungs
Lungs prepare for final development.
D-340
Birth
Average time for foaling.
Foaling Window
Jul 25, 2027
Estimated Due Date
Average foaling expected around 340 days.
Delivery PossibleJul 5, 2027
Upper Normal LimitAug 24, 2027
Vet check recommended at days 15, 30, and 45 to confirm pregnancy.
Ensure booster vaccinations 4-6 weeks before the due date.
About this calculator
The 11-Month Equine Journey
Horse gestation averages 340 days but is famously variable (320–370 days). Factors like the mare's age, breed, and even the amount of daylight (photoperiod) can influence the duration. Foals born before 320 days are often considered premature and require intensive vet care.
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Pro Tips
Waxing Up: Look for small beads of amber-colored 'wax' (dried colostrum) on the teat ends 24-48 hours before birth.
The Caslick Check: If your mare had a Caslick procedure (surgical closure of the upper vulva), ensure it is opened by a vet 2-4 weeks before the due date.
Colostrum is Gold: The foal must nurse within 2 hours to receive vital antibodies. Have a vet check IgG levels if in doubt.
Night Watch: 80% of mares foal between 10 PM and 6 AM. Use cameras or birth alarms to ensure you don't miss it.
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Fun Facts
"A foal's legs are roughly 80-90% of their adult length at birth!"
"Mares can 'pause' early labor for hours if they feel stressed or watched."
"The official birthday of all Thoroughbred racing horses in the North is January 1st, regardless of their actual birth date."
"The placenta should be delivered within 3 hours of birth; if not, it's a veterinary emergency."
