Donkey Gestation Calculator
A donkey's gestation period is about 365 days, or roughly 11 months and 4 weeks, though it ranges from 340 to 390 days depending on breed and individual animal.
How to use the donkey gestation calculator
- 1. Choose what you know. Enter the breeding date to get a due date, or switch to the target due date mode to work backwards to the breeding date you need.
- 2. Refine the inputs. The calculator uses the 365-day average for this species.
- 3. Plan around the range. Use the earliest and latest dates and the milestone timeline to schedule checks, feed changes and preparation of the foaling area.
Calculate a foal due date
Estimated foaling date
Sunday, 12 September 2027
Earliest
18 Aug 2027
Latest
7 Oct 2027
0 of 365 days elapsed
Milestone timeline
| Day | Milestone | Date |
|---|---|---|
| 16 | Early ultrasound: confirm pregnancy and check for twins | 28 Sept 2026 |
| 60 | Second scan — twin pregnancies in donkeys are high risk | 11 Nov 2026 |
| 210 | Vaccination and worming ahead of foaling | 10 Apr 2027 |
| 300 | Increase the ration; most foal growth is in the last trimester | 9 Jul 2027 |
| 345 | Earliest normal foaling — move her to the foaling area | 23 Aug 2027 |
| 365 | Expected foaling (a year is the practical rule) | 12 Sept 2027 |
| 390 | Still no foal? Donkeys often go this long, but have a vet check her | 7 Oct 2027 |
How long is a donkey's gestation period?
The average is 365 days from breeding to foaling, about 11 months and 4 weeks. Anything between 340 and 390 days is normal, and a typical litter is 1 foal. Treat the calculated date as the middle of that window rather than a fixed appointment.
Donkey gestation table: breeding date to foaling date
Breeding dates one week apart with the matching foaling date at 365 days.
| Breeding date | Expected foaling date |
|---|---|
| 12 Sept 2026 | 12 Sept 2027 |
| 19 Sept 2026 | 19 Sept 2027 |
| 26 Sept 2026 | 26 Sept 2027 |
| 3 Oct 2026 | 3 Oct 2027 |
| 10 Oct 2026 | 10 Oct 2027 |
| 17 Oct 2026 | 17 Oct 2027 |
| 24 Oct 2026 | 24 Oct 2027 |
| 31 Oct 2026 | 31 Oct 2027 |
| 7 Nov 2026 | 7 Nov 2027 |
| 14 Nov 2026 | 14 Nov 2027 |
| 21 Nov 2026 | 21 Nov 2027 |
| 28 Nov 2026 | 28 Nov 2027 |
Working backwards from a target foaling date
If you want foals on the ground in a particular week, switch the calculator to target date mode and enter the date you are aiming for. It subtracts 365 days to give the breeding date to book, plus the earliest and latest service dates that still land inside your window.