Horse Gestation / Due Date Calculator
Calculate the foaling due date for a horse (mare) from the breeding date (gestation ~340 days), with pre-foaling management reminders.
A mare's gestation averages about 340 days (11 months) but varies widely, from 320 to 360 days. Enter the breeding date to get the due date plus key pre-foaling management reminders.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Livestock keepers and vets use the free Horse Gestation Calculator to mark the foaling date and schedule dry-off, vaccination and pen moves in advance.
About Horse Gestation / Due Date Calculator
A mare's gestation averages about 340 days (11 months) but varies widely, from 320 to 360 days. This calculator turns the breeding (or AI) date into the expected foaling date and a normal range, and lists the key pre-foaling jobs — so nothing is missed. Horse (mare) gestation averages about 340 days; enter the service date and the tool counts forward, also flagging when to prepare for the birth. Knowing the date protects both dam and offspring and lets you plan labour and facilities.
How to use Horse Gestation / Due Date Calculator
- 1Enter the breeding / AI / service date.
- 2Read the expected foaling date and the earliest–latest range.
- 3Note the pre-birth management dates and plan accordingly.
Why use Horse Gestation / Due Date Calculator?
- ✓Uses the correct ~340-day gestation for horse (mare)
- ✓Gives the expected foaling date and a normal range
- ✓Lists pre-birth management reminders (dry-off, vaccination, pen move)
- ✓Free, instant and fully in-browser
Frequently asked questions
How long is the gestation period of a horse?+
About 340 days on average (± 15 days is normal). A mare's gestation averages about 340 days (11 months) but varies widely, from 320 to 360 days.
How do I calculate the foaling date?+
Add the gestation length (~340 days) to the breeding date. This tool does it instantly and also marks a normal range, since births a few days either side of average are common.
What should I do before foaling?+
Prepare a clean, quiet birthing area, ensure pre-birth vaccination and (for dairy animals) timely dry-off. The tool lists these dates counted back from the due date so you can schedule them.
Is this tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline at the farm and your data never leaves the device.
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