Find the day the ram went in (or the exact breeding date) and read across for the expected lambing date and the normal window, about 142 to 152 days. For a single ewe, the sheep gestation calculator also shows the days-to-go count and the feed-increase reminder.
How to use this lambing chart
Find the breeding month, then the breeding day. The bold date is the average lambing date, using the 147 day average. With a flock mating, the first lambs usually arrive at the early end of the window and lambing spreads out over the ram's time with the ewes.
Example. A ewe bred on October 1 is due around Feb 25 the following spring. Start increasing feed from about Jan 14 for ewes carrying multiples.
Why lambing dates vary
- Breed. Early-maturing meat breeds tend toward the short end of the range, fine-wool breeds toward the long end.
- Litter size. Ewes carrying twins or triplets often lamb a little early.
- Marking harness records. A raddle or crayon harness on the ram, changed color every 17 days, gives the most reliable breeding dates for a flock.
Call your veterinarian if a ewe strains hard for more than 30 minutes without progress, or shows signs of pregnancy toxemia in the last six weeks (standing apart, not eating).
Leap years
The chart uses a normal 365 day year. If February 29 falls between breeding and lambing, the real due date is one day earlier than listed. The calculator handles leap years automatically.
Sheep gestation chart by breeding month
Bred in January
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Jan 1 | May 28 | May 23 | Jun 2 |
| Jan 2 | May 29 | May 24 | Jun 3 |
| Jan 3 | May 30 | May 25 | Jun 4 |
| Jan 4 | May 31 | May 26 | Jun 5 |
| Jan 5 | Jun 1 | May 27 | Jun 6 |
| Jan 6 | Jun 2 | May 28 | Jun 7 |
| Jan 7 | Jun 3 | May 29 | Jun 8 |
| Jan 8 | Jun 4 | May 30 | Jun 9 |
| Jan 9 | Jun 5 | May 31 | Jun 10 |
| Jan 10 | Jun 6 | Jun 1 | Jun 11 |
| Jan 11 | Jun 7 | Jun 2 | Jun 12 |
| Jan 12 | Jun 8 | Jun 3 | Jun 13 |
| Jan 13 | Jun 9 | Jun 4 | Jun 14 |
| Jan 14 | Jun 10 | Jun 5 | Jun 15 |
| Jan 15 | Jun 11 | Jun 6 | Jun 16 |
| Jan 16 | Jun 12 | Jun 7 | Jun 17 |
| Jan 17 | Jun 13 | Jun 8 | Jun 18 |
| Jan 18 | Jun 14 | Jun 9 | Jun 19 |
| Jan 19 | Jun 15 | Jun 10 | Jun 20 |
| Jan 20 | Jun 16 | Jun 11 | Jun 21 |
| Jan 21 | Jun 17 | Jun 12 | Jun 22 |
| Jan 22 | Jun 18 | Jun 13 | Jun 23 |
| Jan 23 | Jun 19 | Jun 14 | Jun 24 |
| Jan 24 | Jun 20 | Jun 15 | Jun 25 |
| Jan 25 | Jun 21 | Jun 16 | Jun 26 |
| Jan 26 | Jun 22 | Jun 17 | Jun 27 |
| Jan 27 | Jun 23 | Jun 18 | Jun 28 |
| Jan 28 | Jun 24 | Jun 19 | Jun 29 |
| Jan 29 | Jun 25 | Jun 20 | Jun 30 |
| Jan 30 | Jun 26 | Jun 21 | Jul 1 |
| Jan 31 | Jun 27 | Jun 22 | Jul 2 |
Bred in February
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Feb 1 | Jun 28 | Jun 23 | Jul 3 |
| Feb 2 | Jun 29 | Jun 24 | Jul 4 |
| Feb 3 | Jun 30 | Jun 25 | Jul 5 |
| Feb 4 | Jul 1 | Jun 26 | Jul 6 |
| Feb 5 | Jul 2 | Jun 27 | Jul 7 |
| Feb 6 | Jul 3 | Jun 28 | Jul 8 |
| Feb 7 | Jul 4 | Jun 29 | Jul 9 |
| Feb 8 | Jul 5 | Jun 30 | Jul 10 |
| Feb 9 | Jul 6 | Jul 1 | Jul 11 |
| Feb 10 | Jul 7 | Jul 2 | Jul 12 |
| Feb 11 | Jul 8 | Jul 3 | Jul 13 |
| Feb 12 | Jul 9 | Jul 4 | Jul 14 |
| Feb 13 | Jul 10 | Jul 5 | Jul 15 |
| Feb 14 | Jul 11 | Jul 6 | Jul 16 |
| Feb 15 | Jul 12 | Jul 7 | Jul 17 |
| Feb 16 | Jul 13 | Jul 8 | Jul 18 |
| Feb 17 | Jul 14 | Jul 9 | Jul 19 |
| Feb 18 | Jul 15 | Jul 10 | Jul 20 |
| Feb 19 | Jul 16 | Jul 11 | Jul 21 |
| Feb 20 | Jul 17 | Jul 12 | Jul 22 |
| Feb 21 | Jul 18 | Jul 13 | Jul 23 |
| Feb 22 | Jul 19 | Jul 14 | Jul 24 |
| Feb 23 | Jul 20 | Jul 15 | Jul 25 |
| Feb 24 | Jul 21 | Jul 16 | Jul 26 |
| Feb 25 | Jul 22 | Jul 17 | Jul 27 |
| Feb 26 | Jul 23 | Jul 18 | Jul 28 |
| Feb 27 | Jul 24 | Jul 19 | Jul 29 |
| Feb 28 | Jul 25 | Jul 20 | Jul 30 |
Bred in March
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Mar 1 | Jul 26 | Jul 21 | Jul 31 |
| Mar 2 | Jul 27 | Jul 22 | Aug 1 |
| Mar 3 | Jul 28 | Jul 23 | Aug 2 |
| Mar 4 | Jul 29 | Jul 24 | Aug 3 |
| Mar 5 | Jul 30 | Jul 25 | Aug 4 |
| Mar 6 | Jul 31 | Jul 26 | Aug 5 |
| Mar 7 | Aug 1 | Jul 27 | Aug 6 |
| Mar 8 | Aug 2 | Jul 28 | Aug 7 |
| Mar 9 | Aug 3 | Jul 29 | Aug 8 |
| Mar 10 | Aug 4 | Jul 30 | Aug 9 |
| Mar 11 | Aug 5 | Jul 31 | Aug 10 |
| Mar 12 | Aug 6 | Aug 1 | Aug 11 |
| Mar 13 | Aug 7 | Aug 2 | Aug 12 |
| Mar 14 | Aug 8 | Aug 3 | Aug 13 |
| Mar 15 | Aug 9 | Aug 4 | Aug 14 |
| Mar 16 | Aug 10 | Aug 5 | Aug 15 |
| Mar 17 | Aug 11 | Aug 6 | Aug 16 |
| Mar 18 | Aug 12 | Aug 7 | Aug 17 |
| Mar 19 | Aug 13 | Aug 8 | Aug 18 |
| Mar 20 | Aug 14 | Aug 9 | Aug 19 |
| Mar 21 | Aug 15 | Aug 10 | Aug 20 |
| Mar 22 | Aug 16 | Aug 11 | Aug 21 |
| Mar 23 | Aug 17 | Aug 12 | Aug 22 |
| Mar 24 | Aug 18 | Aug 13 | Aug 23 |
| Mar 25 | Aug 19 | Aug 14 | Aug 24 |
| Mar 26 | Aug 20 | Aug 15 | Aug 25 |
| Mar 27 | Aug 21 | Aug 16 | Aug 26 |
| Mar 28 | Aug 22 | Aug 17 | Aug 27 |
| Mar 29 | Aug 23 | Aug 18 | Aug 28 |
| Mar 30 | Aug 24 | Aug 19 | Aug 29 |
| Mar 31 | Aug 25 | Aug 20 | Aug 30 |
Bred in April
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Apr 1 | Aug 26 | Aug 21 | Aug 31 |
| Apr 2 | Aug 27 | Aug 22 | Sep 1 |
| Apr 3 | Aug 28 | Aug 23 | Sep 2 |
| Apr 4 | Aug 29 | Aug 24 | Sep 3 |
| Apr 5 | Aug 30 | Aug 25 | Sep 4 |
| Apr 6 | Aug 31 | Aug 26 | Sep 5 |
| Apr 7 | Sep 1 | Aug 27 | Sep 6 |
| Apr 8 | Sep 2 | Aug 28 | Sep 7 |
| Apr 9 | Sep 3 | Aug 29 | Sep 8 |
| Apr 10 | Sep 4 | Aug 30 | Sep 9 |
| Apr 11 | Sep 5 | Aug 31 | Sep 10 |
| Apr 12 | Sep 6 | Sep 1 | Sep 11 |
| Apr 13 | Sep 7 | Sep 2 | Sep 12 |
| Apr 14 | Sep 8 | Sep 3 | Sep 13 |
| Apr 15 | Sep 9 | Sep 4 | Sep 14 |
| Apr 16 | Sep 10 | Sep 5 | Sep 15 |
| Apr 17 | Sep 11 | Sep 6 | Sep 16 |
| Apr 18 | Sep 12 | Sep 7 | Sep 17 |
| Apr 19 | Sep 13 | Sep 8 | Sep 18 |
| Apr 20 | Sep 14 | Sep 9 | Sep 19 |
| Apr 21 | Sep 15 | Sep 10 | Sep 20 |
| Apr 22 | Sep 16 | Sep 11 | Sep 21 |
| Apr 23 | Sep 17 | Sep 12 | Sep 22 |
| Apr 24 | Sep 18 | Sep 13 | Sep 23 |
| Apr 25 | Sep 19 | Sep 14 | Sep 24 |
| Apr 26 | Sep 20 | Sep 15 | Sep 25 |
| Apr 27 | Sep 21 | Sep 16 | Sep 26 |
| Apr 28 | Sep 22 | Sep 17 | Sep 27 |
| Apr 29 | Sep 23 | Sep 18 | Sep 28 |
| Apr 30 | Sep 24 | Sep 19 | Sep 29 |
Bred in May
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| May 1 | Sep 25 | Sep 20 | Sep 30 |
| May 2 | Sep 26 | Sep 21 | Oct 1 |
| May 3 | Sep 27 | Sep 22 | Oct 2 |
| May 4 | Sep 28 | Sep 23 | Oct 3 |
| May 5 | Sep 29 | Sep 24 | Oct 4 |
| May 6 | Sep 30 | Sep 25 | Oct 5 |
| May 7 | Oct 1 | Sep 26 | Oct 6 |
| May 8 | Oct 2 | Sep 27 | Oct 7 |
| May 9 | Oct 3 | Sep 28 | Oct 8 |
| May 10 | Oct 4 | Sep 29 | Oct 9 |
| May 11 | Oct 5 | Sep 30 | Oct 10 |
| May 12 | Oct 6 | Oct 1 | Oct 11 |
| May 13 | Oct 7 | Oct 2 | Oct 12 |
| May 14 | Oct 8 | Oct 3 | Oct 13 |
| May 15 | Oct 9 | Oct 4 | Oct 14 |
| May 16 | Oct 10 | Oct 5 | Oct 15 |
| May 17 | Oct 11 | Oct 6 | Oct 16 |
| May 18 | Oct 12 | Oct 7 | Oct 17 |
| May 19 | Oct 13 | Oct 8 | Oct 18 |
| May 20 | Oct 14 | Oct 9 | Oct 19 |
| May 21 | Oct 15 | Oct 10 | Oct 20 |
| May 22 | Oct 16 | Oct 11 | Oct 21 |
| May 23 | Oct 17 | Oct 12 | Oct 22 |
| May 24 | Oct 18 | Oct 13 | Oct 23 |
| May 25 | Oct 19 | Oct 14 | Oct 24 |
| May 26 | Oct 20 | Oct 15 | Oct 25 |
| May 27 | Oct 21 | Oct 16 | Oct 26 |
| May 28 | Oct 22 | Oct 17 | Oct 27 |
| May 29 | Oct 23 | Oct 18 | Oct 28 |
| May 30 | Oct 24 | Oct 19 | Oct 29 |
| May 31 | Oct 25 | Oct 20 | Oct 30 |
Bred in June
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Jun 1 | Oct 26 | Oct 21 | Oct 31 |
| Jun 2 | Oct 27 | Oct 22 | Nov 1 |
| Jun 3 | Oct 28 | Oct 23 | Nov 2 |
| Jun 4 | Oct 29 | Oct 24 | Nov 3 |
| Jun 5 | Oct 30 | Oct 25 | Nov 4 |
| Jun 6 | Oct 31 | Oct 26 | Nov 5 |
| Jun 7 | Nov 1 | Oct 27 | Nov 6 |
| Jun 8 | Nov 2 | Oct 28 | Nov 7 |
| Jun 9 | Nov 3 | Oct 29 | Nov 8 |
| Jun 10 | Nov 4 | Oct 30 | Nov 9 |
| Jun 11 | Nov 5 | Oct 31 | Nov 10 |
| Jun 12 | Nov 6 | Nov 1 | Nov 11 |
| Jun 13 | Nov 7 | Nov 2 | Nov 12 |
| Jun 14 | Nov 8 | Nov 3 | Nov 13 |
| Jun 15 | Nov 9 | Nov 4 | Nov 14 |
| Jun 16 | Nov 10 | Nov 5 | Nov 15 |
| Jun 17 | Nov 11 | Nov 6 | Nov 16 |
| Jun 18 | Nov 12 | Nov 7 | Nov 17 |
| Jun 19 | Nov 13 | Nov 8 | Nov 18 |
| Jun 20 | Nov 14 | Nov 9 | Nov 19 |
| Jun 21 | Nov 15 | Nov 10 | Nov 20 |
| Jun 22 | Nov 16 | Nov 11 | Nov 21 |
| Jun 23 | Nov 17 | Nov 12 | Nov 22 |
| Jun 24 | Nov 18 | Nov 13 | Nov 23 |
| Jun 25 | Nov 19 | Nov 14 | Nov 24 |
| Jun 26 | Nov 20 | Nov 15 | Nov 25 |
| Jun 27 | Nov 21 | Nov 16 | Nov 26 |
| Jun 28 | Nov 22 | Nov 17 | Nov 27 |
| Jun 29 | Nov 23 | Nov 18 | Nov 28 |
| Jun 30 | Nov 24 | Nov 19 | Nov 29 |
Bred in July
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Jul 1 | Nov 25 | Nov 20 | Nov 30 |
| Jul 2 | Nov 26 | Nov 21 | Dec 1 |
| Jul 3 | Nov 27 | Nov 22 | Dec 2 |
| Jul 4 | Nov 28 | Nov 23 | Dec 3 |
| Jul 5 | Nov 29 | Nov 24 | Dec 4 |
| Jul 6 | Nov 30 | Nov 25 | Dec 5 |
| Jul 7 | Dec 1 | Nov 26 | Dec 6 |
| Jul 8 | Dec 2 | Nov 27 | Dec 7 |
| Jul 9 | Dec 3 | Nov 28 | Dec 8 |
| Jul 10 | Dec 4 | Nov 29 | Dec 9 |
| Jul 11 | Dec 5 | Nov 30 | Dec 10 |
| Jul 12 | Dec 6 | Dec 1 | Dec 11 |
| Jul 13 | Dec 7 | Dec 2 | Dec 12 |
| Jul 14 | Dec 8 | Dec 3 | Dec 13 |
| Jul 15 | Dec 9 | Dec 4 | Dec 14 |
| Jul 16 | Dec 10 | Dec 5 | Dec 15 |
| Jul 17 | Dec 11 | Dec 6 | Dec 16 |
| Jul 18 | Dec 12 | Dec 7 | Dec 17 |
| Jul 19 | Dec 13 | Dec 8 | Dec 18 |
| Jul 20 | Dec 14 | Dec 9 | Dec 19 |
| Jul 21 | Dec 15 | Dec 10 | Dec 20 |
| Jul 22 | Dec 16 | Dec 11 | Dec 21 |
| Jul 23 | Dec 17 | Dec 12 | Dec 22 |
| Jul 24 | Dec 18 | Dec 13 | Dec 23 |
| Jul 25 | Dec 19 | Dec 14 | Dec 24 |
| Jul 26 | Dec 20 | Dec 15 | Dec 25 |
| Jul 27 | Dec 21 | Dec 16 | Dec 26 |
| Jul 28 | Dec 22 | Dec 17 | Dec 27 |
| Jul 29 | Dec 23 | Dec 18 | Dec 28 |
| Jul 30 | Dec 24 | Dec 19 | Dec 29 |
| Jul 31 | Dec 25 | Dec 20 | Dec 30 |
Bred in August
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Aug 1 | Dec 26 | Dec 21 | Dec 31 |
| Aug 2 | Dec 27 | Dec 22 | Jan 1 |
| Aug 3 | Dec 28 | Dec 23 | Jan 2 |
| Aug 4 | Dec 29 | Dec 24 | Jan 3 |
| Aug 5 | Dec 30 | Dec 25 | Jan 4 |
| Aug 6 | Dec 31 | Dec 26 | Jan 5 |
| Aug 7 | Jan 1 | Dec 27 | Jan 6 |
| Aug 8 | Jan 2 | Dec 28 | Jan 7 |
| Aug 9 | Jan 3 | Dec 29 | Jan 8 |
| Aug 10 | Jan 4 | Dec 30 | Jan 9 |
| Aug 11 | Jan 5 | Dec 31 | Jan 10 |
| Aug 12 | Jan 6 | Jan 1 | Jan 11 |
| Aug 13 | Jan 7 | Jan 2 | Jan 12 |
| Aug 14 | Jan 8 | Jan 3 | Jan 13 |
| Aug 15 | Jan 9 | Jan 4 | Jan 14 |
| Aug 16 | Jan 10 | Jan 5 | Jan 15 |
| Aug 17 | Jan 11 | Jan 6 | Jan 16 |
| Aug 18 | Jan 12 | Jan 7 | Jan 17 |
| Aug 19 | Jan 13 | Jan 8 | Jan 18 |
| Aug 20 | Jan 14 | Jan 9 | Jan 19 |
| Aug 21 | Jan 15 | Jan 10 | Jan 20 |
| Aug 22 | Jan 16 | Jan 11 | Jan 21 |
| Aug 23 | Jan 17 | Jan 12 | Jan 22 |
| Aug 24 | Jan 18 | Jan 13 | Jan 23 |
| Aug 25 | Jan 19 | Jan 14 | Jan 24 |
| Aug 26 | Jan 20 | Jan 15 | Jan 25 |
| Aug 27 | Jan 21 | Jan 16 | Jan 26 |
| Aug 28 | Jan 22 | Jan 17 | Jan 27 |
| Aug 29 | Jan 23 | Jan 18 | Jan 28 |
| Aug 30 | Jan 24 | Jan 19 | Jan 29 |
| Aug 31 | Jan 25 | Jan 20 | Jan 30 |
Bred in September
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Sep 1 | Jan 26 | Jan 21 | Jan 31 |
| Sep 2 | Jan 27 | Jan 22 | Feb 1 |
| Sep 3 | Jan 28 | Jan 23 | Feb 2 |
| Sep 4 | Jan 29 | Jan 24 | Feb 3 |
| Sep 5 | Jan 30 | Jan 25 | Feb 4 |
| Sep 6 | Jan 31 | Jan 26 | Feb 5 |
| Sep 7 | Feb 1 | Jan 27 | Feb 6 |
| Sep 8 | Feb 2 | Jan 28 | Feb 7 |
| Sep 9 | Feb 3 | Jan 29 | Feb 8 |
| Sep 10 | Feb 4 | Jan 30 | Feb 9 |
| Sep 11 | Feb 5 | Jan 31 | Feb 10 |
| Sep 12 | Feb 6 | Feb 1 | Feb 11 |
| Sep 13 | Feb 7 | Feb 2 | Feb 12 |
| Sep 14 | Feb 8 | Feb 3 | Feb 13 |
| Sep 15 | Feb 9 | Feb 4 | Feb 14 |
| Sep 16 | Feb 10 | Feb 5 | Feb 15 |
| Sep 17 | Feb 11 | Feb 6 | Feb 16 |
| Sep 18 | Feb 12 | Feb 7 | Feb 17 |
| Sep 19 | Feb 13 | Feb 8 | Feb 18 |
| Sep 20 | Feb 14 | Feb 9 | Feb 19 |
| Sep 21 | Feb 15 | Feb 10 | Feb 20 |
| Sep 22 | Feb 16 | Feb 11 | Feb 21 |
| Sep 23 | Feb 17 | Feb 12 | Feb 22 |
| Sep 24 | Feb 18 | Feb 13 | Feb 23 |
| Sep 25 | Feb 19 | Feb 14 | Feb 24 |
| Sep 26 | Feb 20 | Feb 15 | Feb 25 |
| Sep 27 | Feb 21 | Feb 16 | Feb 26 |
| Sep 28 | Feb 22 | Feb 17 | Feb 27 |
| Sep 29 | Feb 23 | Feb 18 | Feb 28 |
| Sep 30 | Feb 24 | Feb 19 | Mar 1 |
Bred in October
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Oct 1 | Feb 25 | Feb 20 | Mar 2 |
| Oct 2 | Feb 26 | Feb 21 | Mar 3 |
| Oct 3 | Feb 27 | Feb 22 | Mar 4 |
| Oct 4 | Feb 28 | Feb 23 | Mar 5 |
| Oct 5 | Mar 1 | Feb 24 | Mar 6 |
| Oct 6 | Mar 2 | Feb 25 | Mar 7 |
| Oct 7 | Mar 3 | Feb 26 | Mar 8 |
| Oct 8 | Mar 4 | Feb 27 | Mar 9 |
| Oct 9 | Mar 5 | Feb 28 | Mar 10 |
| Oct 10 | Mar 6 | Mar 1 | Mar 11 |
| Oct 11 | Mar 7 | Mar 2 | Mar 12 |
| Oct 12 | Mar 8 | Mar 3 | Mar 13 |
| Oct 13 | Mar 9 | Mar 4 | Mar 14 |
| Oct 14 | Mar 10 | Mar 5 | Mar 15 |
| Oct 15 | Mar 11 | Mar 6 | Mar 16 |
| Oct 16 | Mar 12 | Mar 7 | Mar 17 |
| Oct 17 | Mar 13 | Mar 8 | Mar 18 |
| Oct 18 | Mar 14 | Mar 9 | Mar 19 |
| Oct 19 | Mar 15 | Mar 10 | Mar 20 |
| Oct 20 | Mar 16 | Mar 11 | Mar 21 |
| Oct 21 | Mar 17 | Mar 12 | Mar 22 |
| Oct 22 | Mar 18 | Mar 13 | Mar 23 |
| Oct 23 | Mar 19 | Mar 14 | Mar 24 |
| Oct 24 | Mar 20 | Mar 15 | Mar 25 |
| Oct 25 | Mar 21 | Mar 16 | Mar 26 |
| Oct 26 | Mar 22 | Mar 17 | Mar 27 |
| Oct 27 | Mar 23 | Mar 18 | Mar 28 |
| Oct 28 | Mar 24 | Mar 19 | Mar 29 |
| Oct 29 | Mar 25 | Mar 20 | Mar 30 |
| Oct 30 | Mar 26 | Mar 21 | Mar 31 |
| Oct 31 | Mar 27 | Mar 22 | Apr 1 |
Bred in November
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Nov 1 | Mar 28 | Mar 23 | Apr 2 |
| Nov 2 | Mar 29 | Mar 24 | Apr 3 |
| Nov 3 | Mar 30 | Mar 25 | Apr 4 |
| Nov 4 | Mar 31 | Mar 26 | Apr 5 |
| Nov 5 | Apr 1 | Mar 27 | Apr 6 |
| Nov 6 | Apr 2 | Mar 28 | Apr 7 |
| Nov 7 | Apr 3 | Mar 29 | Apr 8 |
| Nov 8 | Apr 4 | Mar 30 | Apr 9 |
| Nov 9 | Apr 5 | Mar 31 | Apr 10 |
| Nov 10 | Apr 6 | Apr 1 | Apr 11 |
| Nov 11 | Apr 7 | Apr 2 | Apr 12 |
| Nov 12 | Apr 8 | Apr 3 | Apr 13 |
| Nov 13 | Apr 9 | Apr 4 | Apr 14 |
| Nov 14 | Apr 10 | Apr 5 | Apr 15 |
| Nov 15 | Apr 11 | Apr 6 | Apr 16 |
| Nov 16 | Apr 12 | Apr 7 | Apr 17 |
| Nov 17 | Apr 13 | Apr 8 | Apr 18 |
| Nov 18 | Apr 14 | Apr 9 | Apr 19 |
| Nov 19 | Apr 15 | Apr 10 | Apr 20 |
| Nov 20 | Apr 16 | Apr 11 | Apr 21 |
| Nov 21 | Apr 17 | Apr 12 | Apr 22 |
| Nov 22 | Apr 18 | Apr 13 | Apr 23 |
| Nov 23 | Apr 19 | Apr 14 | Apr 24 |
| Nov 24 | Apr 20 | Apr 15 | Apr 25 |
| Nov 25 | Apr 21 | Apr 16 | Apr 26 |
| Nov 26 | Apr 22 | Apr 17 | Apr 27 |
| Nov 27 | Apr 23 | Apr 18 | Apr 28 |
| Nov 28 | Apr 24 | Apr 19 | Apr 29 |
| Nov 29 | Apr 25 | Apr 20 | Apr 30 |
| Nov 30 | Apr 26 | Apr 21 | May 1 |
Bred in December
| Bred | Due (147 days) | Earliest (142) | Latest (152) |
|---|
| Dec 1 | Apr 27 | Apr 22 | May 2 |
| Dec 2 | Apr 28 | Apr 23 | May 3 |
| Dec 3 | Apr 29 | Apr 24 | May 4 |
| Dec 4 | Apr 30 | Apr 25 | May 5 |
| Dec 5 | May 1 | Apr 26 | May 6 |
| Dec 6 | May 2 | Apr 27 | May 7 |
| Dec 7 | May 3 | Apr 28 | May 8 |
| Dec 8 | May 4 | Apr 29 | May 9 |
| Dec 9 | May 5 | Apr 30 | May 10 |
| Dec 10 | May 6 | May 1 | May 11 |
| Dec 11 | May 7 | May 2 | May 12 |
| Dec 12 | May 8 | May 3 | May 13 |
| Dec 13 | May 9 | May 4 | May 14 |
| Dec 14 | May 10 | May 5 | May 15 |
| Dec 15 | May 11 | May 6 | May 16 |
| Dec 16 | May 12 | May 7 | May 17 |
| Dec 17 | May 13 | May 8 | May 18 |
| Dec 18 | May 14 | May 9 | May 19 |
| Dec 19 | May 15 | May 10 | May 20 |
| Dec 20 | May 16 | May 11 | May 21 |
| Dec 21 | May 17 | May 12 | May 22 |
| Dec 22 | May 18 | May 13 | May 23 |
| Dec 23 | May 19 | May 14 | May 24 |
| Dec 24 | May 20 | May 15 | May 25 |
| Dec 25 | May 21 | May 16 | May 26 |
| Dec 26 | May 22 | May 17 | May 27 |
| Dec 27 | May 23 | May 18 | May 28 |
| Dec 28 | May 24 | May 19 | May 29 |
| Dec 29 | May 25 | May 20 | May 30 |
| Dec 30 | May 26 | May 21 | May 31 |
| Dec 31 | May 27 | May 22 | Jun 1 |
Frequently asked questions
How long are sheep pregnant?
About 147 days, with a normal range of roughly 142 to 152 days.
How do I read a sheep gestation chart?
Find the breeding (or ram-in) date in the left column. The bold column shows the average lambing date, with the earliest and latest normal dates either side.
Why does lambing spread over several weeks?
A ram left with the flock breeds ewes across their natural 17-day heat cycles, so lambing follows the same spread.
Sources
Calculators for this
Last updated November 10, 2026. Dates are averages with a normal window. How we check our data. Found an error? Tell us.