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Donkey Gestation Calculator & Chart

Donkeys carry longer than horses: about 12 months (365 days) on average, with a wide normal range of roughly 340–390 days. Miniature donkeys often run toward the shorter end, mammoth jennets longer. Like mares, jennies are famous for waiting until nobody is watching to foal.

Printable donkeys gestation chart (365-day average)

Print this and tack it by the breeding pen — or use the free HerdFlo app to get the exact date for any breeding, breed-adjusted, with calendar reminders.

BredFoaling
Jan 1Jan 1 *
Jan 8Jan 8 *
Jan 15Jan 15 *
Jan 22Jan 22 *
Jan 31Jan 31 *
Feb 1Feb 1 *
Feb 8Feb 8 *
Feb 15Feb 15 *
Feb 22Feb 22 *
Feb 28Feb 28 *
Mar 1Mar 1 *
Mar 8Mar 8 *
Mar 15Mar 15 *
Mar 22Mar 22 *
Mar 31Mar 31 *
Apr 1Apr 1 *
Apr 8Apr 8 *
Apr 15Apr 15 *
Apr 22Apr 22 *
Apr 30Apr 30 *
May 1May 1 *
May 8May 8 *
May 15May 15 *
May 22May 22 *
May 31May 31 *
Jun 1Jun 1 *
Jun 8Jun 8 *
Jun 15Jun 15 *
Jun 22Jun 22 *
Jun 30Jun 30 *
Jul 1Jul 1 *
Jul 8Jul 8 *
Jul 15Jul 15 *
Jul 22Jul 22 *
Jul 31Jul 31 *
Aug 1Aug 1 *
Aug 8Aug 8 *
Aug 15Aug 15 *
Aug 22Aug 22 *
Aug 31Aug 31 *
Sep 1Sep 1 *
Sep 8Sep 8 *
Sep 15Sep 15 *
Sep 22Sep 22 *
Sep 30Sep 30 *
Oct 1Oct 1 *
Oct 8Oct 8 *
Oct 15Oct 15 *
Oct 22Oct 22 *
Oct 31Oct 31 *
Nov 1Nov 1 *
Nov 8Nov 8 *
Nov 15Nov 15 *
Nov 22Nov 22 *
Nov 30Nov 30 *
Dec 1Dec 1 *
Dec 8Dec 8 *
Dec 15Dec 15 *
Dec 22Dec 22 *
Dec 31Dec 31 *

* lands in the following calendar year. Table uses the 365-day average; individual animals vary (340–390 days).

Common questions

How long is a donkey pregnant?

About 12 months — 365 days on average — but anywhere from roughly 340 to 390 days can be normal. Donkeys run about a month longer than horses.

Can a donkey foal date really vary by 50 days?

Yes. Donkeys have one of the widest normal windows in livestock, which is why experienced breeders track udder development and pelvic relaxation rather than the calendar alone in the final weeks.

When should a jenny be checked for pregnancy?

An ultrasound around 14–16 days after breeding, with a re-check at 45–60 days, mirrors standard equine practice. Ask your equine vet.

Do mules and hinnies change the timeline?

A jenny carrying a mule foal (horse sire) or a mare carrying a hinny still follows the mother’s gestation pattern — count from the dam’s species.

Track the whole herd, not just one date

HerdFlo Pro adds animal records, breeding-to-calving tracking, weaning weights, and a treatment log with withdrawal dates. Join the launch list in the free app.

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