Find a mare’s expected foaling window from the breeding date, using the normal 320–360 day gestation range.
Mares normally foal 320–360 days after breeding (about 340 days). Foaling needs preparation well before the earliest date and a vet on call. Not veterinary advice: this is an estimate for planning only. Always confirm care, feeding and health decisions with a qualified veterinarian.
Average due date
How to use this tool
Use the date of mating or insemination for the mare.
Normal gestation runs 320–360 days, so plan around the whole window.
Prepare housing, feed and a birthing area before the earliest due date.
Pregnancy checks, scans and birth planning are a vet’s job, not a calculator’s.
Formula & worked example
A breeding date of 1 January 2026 gives an average due date 340 days later, with the normal window spanning 320–360 days after breeding.
Limitations — read this before you rely on it
Gestation varies by breed, age, litter size and individual animal, so births outside the 320–360 day window are possible. This tool estimates dates only and cannot confirm pregnancy or predict litter size. Not veterinary advice: this is an estimate for planning only. Always confirm care, feeding and health decisions with a qualified veterinarian.
Frequently asked questions
Typically 320–360 days, averaging about 340 days.
No — it is the middle of the normal range. Healthy births happen across the whole window.
Contact a veterinarian promptly rather than waiting; overdue pregnancies can need intervention.
No. Only veterinary examination or scanning can confirm pregnancy.
A clean, quiet, warm birthing area, fresh water and feed, and your vet’s phone number close at hand.