By the DueBarn team. Updated November 10, 2026.
Find the day your cow or heifer was bred and read across. The due date uses the 283 day average for beef and dairy cattle, and the outer columns show the normal window of about 9 days either side, 274 to 292 days. For a single animal, the cow gestation calculator does this for any year and also gives the date to dry off or move to the calving pen.
How to use this calving chart
Find the breeding month below, then the breeding day. The bold date is the average due date. Most calves arrive within a week either side of it,
but breed, calf sex and the dam's age all shift the date, so watch from the earliest date onward.
Example. A cow bred on June 1 is due around Mar 11 the following year. Start checking her daily from Mar 2.
Why calving dates vary
- Breed. Continental breeds such as Simmental, Charolais and Limousin tend to run a few days longer than Angus or Holstein.
- Calf sex. Bull calves are often carried one to two days longer than heifer calves.
- Dam age. First-calf heifers often calve a day or two earlier than mature cows.
- Twins. Twin pregnancies usually end earlier.
If a cow goes well past the latest date, or shows signs of trouble in labor, call your veterinarian.
Leap years
The chart uses a normal 365 day year. If February 29 falls between breeding and calving, the real due date is one day earlier than listed.
The calculator handles leap years automatically.
Cow gestation chart by breeding month
Bred in January
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Jan 1 | Oct 11 | Oct 2 | Oct 20 |
| Jan 2 | Oct 12 | Oct 3 | Oct 21 |
| Jan 3 | Oct 13 | Oct 4 | Oct 22 |
| Jan 4 | Oct 14 | Oct 5 | Oct 23 |
| Jan 5 | Oct 15 | Oct 6 | Oct 24 |
| Jan 6 | Oct 16 | Oct 7 | Oct 25 |
| Jan 7 | Oct 17 | Oct 8 | Oct 26 |
| Jan 8 | Oct 18 | Oct 9 | Oct 27 |
| Jan 9 | Oct 19 | Oct 10 | Oct 28 |
| Jan 10 | Oct 20 | Oct 11 | Oct 29 |
| Jan 11 | Oct 21 | Oct 12 | Oct 30 |
| Jan 12 | Oct 22 | Oct 13 | Oct 31 |
| Jan 13 | Oct 23 | Oct 14 | Nov 1 |
| Jan 14 | Oct 24 | Oct 15 | Nov 2 |
| Jan 15 | Oct 25 | Oct 16 | Nov 3 |
| Jan 16 | Oct 26 | Oct 17 | Nov 4 |
| Jan 17 | Oct 27 | Oct 18 | Nov 5 |
| Jan 18 | Oct 28 | Oct 19 | Nov 6 |
| Jan 19 | Oct 29 | Oct 20 | Nov 7 |
| Jan 20 | Oct 30 | Oct 21 | Nov 8 |
| Jan 21 | Oct 31 | Oct 22 | Nov 9 |
| Jan 22 | Nov 1 | Oct 23 | Nov 10 |
| Jan 23 | Nov 2 | Oct 24 | Nov 11 |
| Jan 24 | Nov 3 | Oct 25 | Nov 12 |
| Jan 25 | Nov 4 | Oct 26 | Nov 13 |
| Jan 26 | Nov 5 | Oct 27 | Nov 14 |
| Jan 27 | Nov 6 | Oct 28 | Nov 15 |
| Jan 28 | Nov 7 | Oct 29 | Nov 16 |
| Jan 29 | Nov 8 | Oct 30 | Nov 17 |
| Jan 30 | Nov 9 | Oct 31 | Nov 18 |
| Jan 31 | Nov 10 | Nov 1 | Nov 19 |
Bred in February
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Feb 1 | Nov 11 | Nov 2 | Nov 20 |
| Feb 2 | Nov 12 | Nov 3 | Nov 21 |
| Feb 3 | Nov 13 | Nov 4 | Nov 22 |
| Feb 4 | Nov 14 | Nov 5 | Nov 23 |
| Feb 5 | Nov 15 | Nov 6 | Nov 24 |
| Feb 6 | Nov 16 | Nov 7 | Nov 25 |
| Feb 7 | Nov 17 | Nov 8 | Nov 26 |
| Feb 8 | Nov 18 | Nov 9 | Nov 27 |
| Feb 9 | Nov 19 | Nov 10 | Nov 28 |
| Feb 10 | Nov 20 | Nov 11 | Nov 29 |
| Feb 11 | Nov 21 | Nov 12 | Nov 30 |
| Feb 12 | Nov 22 | Nov 13 | Dec 1 |
| Feb 13 | Nov 23 | Nov 14 | Dec 2 |
| Feb 14 | Nov 24 | Nov 15 | Dec 3 |
| Feb 15 | Nov 25 | Nov 16 | Dec 4 |
| Feb 16 | Nov 26 | Nov 17 | Dec 5 |
| Feb 17 | Nov 27 | Nov 18 | Dec 6 |
| Feb 18 | Nov 28 | Nov 19 | Dec 7 |
| Feb 19 | Nov 29 | Nov 20 | Dec 8 |
| Feb 20 | Nov 30 | Nov 21 | Dec 9 |
| Feb 21 | Dec 1 | Nov 22 | Dec 10 |
| Feb 22 | Dec 2 | Nov 23 | Dec 11 |
| Feb 23 | Dec 3 | Nov 24 | Dec 12 |
| Feb 24 | Dec 4 | Nov 25 | Dec 13 |
| Feb 25 | Dec 5 | Nov 26 | Dec 14 |
| Feb 26 | Dec 6 | Nov 27 | Dec 15 |
| Feb 27 | Dec 7 | Nov 28 | Dec 16 |
| Feb 28 | Dec 8 | Nov 29 | Dec 17 |
Bred in March
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Mar 1 | Dec 9 | Nov 30 | Dec 18 |
| Mar 2 | Dec 10 | Dec 1 | Dec 19 |
| Mar 3 | Dec 11 | Dec 2 | Dec 20 |
| Mar 4 | Dec 12 | Dec 3 | Dec 21 |
| Mar 5 | Dec 13 | Dec 4 | Dec 22 |
| Mar 6 | Dec 14 | Dec 5 | Dec 23 |
| Mar 7 | Dec 15 | Dec 6 | Dec 24 |
| Mar 8 | Dec 16 | Dec 7 | Dec 25 |
| Mar 9 | Dec 17 | Dec 8 | Dec 26 |
| Mar 10 | Dec 18 | Dec 9 | Dec 27 |
| Mar 11 | Dec 19 | Dec 10 | Dec 28 |
| Mar 12 | Dec 20 | Dec 11 | Dec 29 |
| Mar 13 | Dec 21 | Dec 12 | Dec 30 |
| Mar 14 | Dec 22 | Dec 13 | Dec 31 |
| Mar 15 | Dec 23 | Dec 14 | Jan 1 |
| Mar 16 | Dec 24 | Dec 15 | Jan 2 |
| Mar 17 | Dec 25 | Dec 16 | Jan 3 |
| Mar 18 | Dec 26 | Dec 17 | Jan 4 |
| Mar 19 | Dec 27 | Dec 18 | Jan 5 |
| Mar 20 | Dec 28 | Dec 19 | Jan 6 |
| Mar 21 | Dec 29 | Dec 20 | Jan 7 |
| Mar 22 | Dec 30 | Dec 21 | Jan 8 |
| Mar 23 | Dec 31 | Dec 22 | Jan 9 |
| Mar 24 | Jan 1 | Dec 23 | Jan 10 |
| Mar 25 | Jan 2 | Dec 24 | Jan 11 |
| Mar 26 | Jan 3 | Dec 25 | Jan 12 |
| Mar 27 | Jan 4 | Dec 26 | Jan 13 |
| Mar 28 | Jan 5 | Dec 27 | Jan 14 |
| Mar 29 | Jan 6 | Dec 28 | Jan 15 |
| Mar 30 | Jan 7 | Dec 29 | Jan 16 |
| Mar 31 | Jan 8 | Dec 30 | Jan 17 |
Bred in April
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Apr 1 | Jan 9 | Dec 31 | Jan 18 |
| Apr 2 | Jan 10 | Jan 1 | Jan 19 |
| Apr 3 | Jan 11 | Jan 2 | Jan 20 |
| Apr 4 | Jan 12 | Jan 3 | Jan 21 |
| Apr 5 | Jan 13 | Jan 4 | Jan 22 |
| Apr 6 | Jan 14 | Jan 5 | Jan 23 |
| Apr 7 | Jan 15 | Jan 6 | Jan 24 |
| Apr 8 | Jan 16 | Jan 7 | Jan 25 |
| Apr 9 | Jan 17 | Jan 8 | Jan 26 |
| Apr 10 | Jan 18 | Jan 9 | Jan 27 |
| Apr 11 | Jan 19 | Jan 10 | Jan 28 |
| Apr 12 | Jan 20 | Jan 11 | Jan 29 |
| Apr 13 | Jan 21 | Jan 12 | Jan 30 |
| Apr 14 | Jan 22 | Jan 13 | Jan 31 |
| Apr 15 | Jan 23 | Jan 14 | Feb 1 |
| Apr 16 | Jan 24 | Jan 15 | Feb 2 |
| Apr 17 | Jan 25 | Jan 16 | Feb 3 |
| Apr 18 | Jan 26 | Jan 17 | Feb 4 |
| Apr 19 | Jan 27 | Jan 18 | Feb 5 |
| Apr 20 | Jan 28 | Jan 19 | Feb 6 |
| Apr 21 | Jan 29 | Jan 20 | Feb 7 |
| Apr 22 | Jan 30 | Jan 21 | Feb 8 |
| Apr 23 | Jan 31 | Jan 22 | Feb 9 |
| Apr 24 | Feb 1 | Jan 23 | Feb 10 |
| Apr 25 | Feb 2 | Jan 24 | Feb 11 |
| Apr 26 | Feb 3 | Jan 25 | Feb 12 |
| Apr 27 | Feb 4 | Jan 26 | Feb 13 |
| Apr 28 | Feb 5 | Jan 27 | Feb 14 |
| Apr 29 | Feb 6 | Jan 28 | Feb 15 |
| Apr 30 | Feb 7 | Jan 29 | Feb 16 |
Bred in May
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| May 1 | Feb 8 | Jan 30 | Feb 17 |
| May 2 | Feb 9 | Jan 31 | Feb 18 |
| May 3 | Feb 10 | Feb 1 | Feb 19 |
| May 4 | Feb 11 | Feb 2 | Feb 20 |
| May 5 | Feb 12 | Feb 3 | Feb 21 |
| May 6 | Feb 13 | Feb 4 | Feb 22 |
| May 7 | Feb 14 | Feb 5 | Feb 23 |
| May 8 | Feb 15 | Feb 6 | Feb 24 |
| May 9 | Feb 16 | Feb 7 | Feb 25 |
| May 10 | Feb 17 | Feb 8 | Feb 26 |
| May 11 | Feb 18 | Feb 9 | Feb 27 |
| May 12 | Feb 19 | Feb 10 | Feb 28 |
| May 13 | Feb 20 | Feb 11 | Mar 1 |
| May 14 | Feb 21 | Feb 12 | Mar 2 |
| May 15 | Feb 22 | Feb 13 | Mar 3 |
| May 16 | Feb 23 | Feb 14 | Mar 4 |
| May 17 | Feb 24 | Feb 15 | Mar 5 |
| May 18 | Feb 25 | Feb 16 | Mar 6 |
| May 19 | Feb 26 | Feb 17 | Mar 7 |
| May 20 | Feb 27 | Feb 18 | Mar 8 |
| May 21 | Feb 28 | Feb 19 | Mar 9 |
| May 22 | Mar 1 | Feb 20 | Mar 10 |
| May 23 | Mar 2 | Feb 21 | Mar 11 |
| May 24 | Mar 3 | Feb 22 | Mar 12 |
| May 25 | Mar 4 | Feb 23 | Mar 13 |
| May 26 | Mar 5 | Feb 24 | Mar 14 |
| May 27 | Mar 6 | Feb 25 | Mar 15 |
| May 28 | Mar 7 | Feb 26 | Mar 16 |
| May 29 | Mar 8 | Feb 27 | Mar 17 |
| May 30 | Mar 9 | Feb 28 | Mar 18 |
| May 31 | Mar 10 | Mar 1 | Mar 19 |
Bred in June
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Jun 1 | Mar 11 | Mar 2 | Mar 20 |
| Jun 2 | Mar 12 | Mar 3 | Mar 21 |
| Jun 3 | Mar 13 | Mar 4 | Mar 22 |
| Jun 4 | Mar 14 | Mar 5 | Mar 23 |
| Jun 5 | Mar 15 | Mar 6 | Mar 24 |
| Jun 6 | Mar 16 | Mar 7 | Mar 25 |
| Jun 7 | Mar 17 | Mar 8 | Mar 26 |
| Jun 8 | Mar 18 | Mar 9 | Mar 27 |
| Jun 9 | Mar 19 | Mar 10 | Mar 28 |
| Jun 10 | Mar 20 | Mar 11 | Mar 29 |
| Jun 11 | Mar 21 | Mar 12 | Mar 30 |
| Jun 12 | Mar 22 | Mar 13 | Mar 31 |
| Jun 13 | Mar 23 | Mar 14 | Apr 1 |
| Jun 14 | Mar 24 | Mar 15 | Apr 2 |
| Jun 15 | Mar 25 | Mar 16 | Apr 3 |
| Jun 16 | Mar 26 | Mar 17 | Apr 4 |
| Jun 17 | Mar 27 | Mar 18 | Apr 5 |
| Jun 18 | Mar 28 | Mar 19 | Apr 6 |
| Jun 19 | Mar 29 | Mar 20 | Apr 7 |
| Jun 20 | Mar 30 | Mar 21 | Apr 8 |
| Jun 21 | Mar 31 | Mar 22 | Apr 9 |
| Jun 22 | Apr 1 | Mar 23 | Apr 10 |
| Jun 23 | Apr 2 | Mar 24 | Apr 11 |
| Jun 24 | Apr 3 | Mar 25 | Apr 12 |
| Jun 25 | Apr 4 | Mar 26 | Apr 13 |
| Jun 26 | Apr 5 | Mar 27 | Apr 14 |
| Jun 27 | Apr 6 | Mar 28 | Apr 15 |
| Jun 28 | Apr 7 | Mar 29 | Apr 16 |
| Jun 29 | Apr 8 | Mar 30 | Apr 17 |
| Jun 30 | Apr 9 | Mar 31 | Apr 18 |
Bred in July
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Jul 1 | Apr 10 | Apr 1 | Apr 19 |
| Jul 2 | Apr 11 | Apr 2 | Apr 20 |
| Jul 3 | Apr 12 | Apr 3 | Apr 21 |
| Jul 4 | Apr 13 | Apr 4 | Apr 22 |
| Jul 5 | Apr 14 | Apr 5 | Apr 23 |
| Jul 6 | Apr 15 | Apr 6 | Apr 24 |
| Jul 7 | Apr 16 | Apr 7 | Apr 25 |
| Jul 8 | Apr 17 | Apr 8 | Apr 26 |
| Jul 9 | Apr 18 | Apr 9 | Apr 27 |
| Jul 10 | Apr 19 | Apr 10 | Apr 28 |
| Jul 11 | Apr 20 | Apr 11 | Apr 29 |
| Jul 12 | Apr 21 | Apr 12 | Apr 30 |
| Jul 13 | Apr 22 | Apr 13 | May 1 |
| Jul 14 | Apr 23 | Apr 14 | May 2 |
| Jul 15 | Apr 24 | Apr 15 | May 3 |
| Jul 16 | Apr 25 | Apr 16 | May 4 |
| Jul 17 | Apr 26 | Apr 17 | May 5 |
| Jul 18 | Apr 27 | Apr 18 | May 6 |
| Jul 19 | Apr 28 | Apr 19 | May 7 |
| Jul 20 | Apr 29 | Apr 20 | May 8 |
| Jul 21 | Apr 30 | Apr 21 | May 9 |
| Jul 22 | May 1 | Apr 22 | May 10 |
| Jul 23 | May 2 | Apr 23 | May 11 |
| Jul 24 | May 3 | Apr 24 | May 12 |
| Jul 25 | May 4 | Apr 25 | May 13 |
| Jul 26 | May 5 | Apr 26 | May 14 |
| Jul 27 | May 6 | Apr 27 | May 15 |
| Jul 28 | May 7 | Apr 28 | May 16 |
| Jul 29 | May 8 | Apr 29 | May 17 |
| Jul 30 | May 9 | Apr 30 | May 18 |
| Jul 31 | May 10 | May 1 | May 19 |
Bred in August
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Aug 1 | May 11 | May 2 | May 20 |
| Aug 2 | May 12 | May 3 | May 21 |
| Aug 3 | May 13 | May 4 | May 22 |
| Aug 4 | May 14 | May 5 | May 23 |
| Aug 5 | May 15 | May 6 | May 24 |
| Aug 6 | May 16 | May 7 | May 25 |
| Aug 7 | May 17 | May 8 | May 26 |
| Aug 8 | May 18 | May 9 | May 27 |
| Aug 9 | May 19 | May 10 | May 28 |
| Aug 10 | May 20 | May 11 | May 29 |
| Aug 11 | May 21 | May 12 | May 30 |
| Aug 12 | May 22 | May 13 | May 31 |
| Aug 13 | May 23 | May 14 | Jun 1 |
| Aug 14 | May 24 | May 15 | Jun 2 |
| Aug 15 | May 25 | May 16 | Jun 3 |
| Aug 16 | May 26 | May 17 | Jun 4 |
| Aug 17 | May 27 | May 18 | Jun 5 |
| Aug 18 | May 28 | May 19 | Jun 6 |
| Aug 19 | May 29 | May 20 | Jun 7 |
| Aug 20 | May 30 | May 21 | Jun 8 |
| Aug 21 | May 31 | May 22 | Jun 9 |
| Aug 22 | Jun 1 | May 23 | Jun 10 |
| Aug 23 | Jun 2 | May 24 | Jun 11 |
| Aug 24 | Jun 3 | May 25 | Jun 12 |
| Aug 25 | Jun 4 | May 26 | Jun 13 |
| Aug 26 | Jun 5 | May 27 | Jun 14 |
| Aug 27 | Jun 6 | May 28 | Jun 15 |
| Aug 28 | Jun 7 | May 29 | Jun 16 |
| Aug 29 | Jun 8 | May 30 | Jun 17 |
| Aug 30 | Jun 9 | May 31 | Jun 18 |
| Aug 31 | Jun 10 | Jun 1 | Jun 19 |
Bred in September
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Sep 1 | Jun 11 | Jun 2 | Jun 20 |
| Sep 2 | Jun 12 | Jun 3 | Jun 21 |
| Sep 3 | Jun 13 | Jun 4 | Jun 22 |
| Sep 4 | Jun 14 | Jun 5 | Jun 23 |
| Sep 5 | Jun 15 | Jun 6 | Jun 24 |
| Sep 6 | Jun 16 | Jun 7 | Jun 25 |
| Sep 7 | Jun 17 | Jun 8 | Jun 26 |
| Sep 8 | Jun 18 | Jun 9 | Jun 27 |
| Sep 9 | Jun 19 | Jun 10 | Jun 28 |
| Sep 10 | Jun 20 | Jun 11 | Jun 29 |
| Sep 11 | Jun 21 | Jun 12 | Jun 30 |
| Sep 12 | Jun 22 | Jun 13 | Jul 1 |
| Sep 13 | Jun 23 | Jun 14 | Jul 2 |
| Sep 14 | Jun 24 | Jun 15 | Jul 3 |
| Sep 15 | Jun 25 | Jun 16 | Jul 4 |
| Sep 16 | Jun 26 | Jun 17 | Jul 5 |
| Sep 17 | Jun 27 | Jun 18 | Jul 6 |
| Sep 18 | Jun 28 | Jun 19 | Jul 7 |
| Sep 19 | Jun 29 | Jun 20 | Jul 8 |
| Sep 20 | Jun 30 | Jun 21 | Jul 9 |
| Sep 21 | Jul 1 | Jun 22 | Jul 10 |
| Sep 22 | Jul 2 | Jun 23 | Jul 11 |
| Sep 23 | Jul 3 | Jun 24 | Jul 12 |
| Sep 24 | Jul 4 | Jun 25 | Jul 13 |
| Sep 25 | Jul 5 | Jun 26 | Jul 14 |
| Sep 26 | Jul 6 | Jun 27 | Jul 15 |
| Sep 27 | Jul 7 | Jun 28 | Jul 16 |
| Sep 28 | Jul 8 | Jun 29 | Jul 17 |
| Sep 29 | Jul 9 | Jun 30 | Jul 18 |
| Sep 30 | Jul 10 | Jul 1 | Jul 19 |
Bred in October
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Oct 1 | Jul 11 | Jul 2 | Jul 20 |
| Oct 2 | Jul 12 | Jul 3 | Jul 21 |
| Oct 3 | Jul 13 | Jul 4 | Jul 22 |
| Oct 4 | Jul 14 | Jul 5 | Jul 23 |
| Oct 5 | Jul 15 | Jul 6 | Jul 24 |
| Oct 6 | Jul 16 | Jul 7 | Jul 25 |
| Oct 7 | Jul 17 | Jul 8 | Jul 26 |
| Oct 8 | Jul 18 | Jul 9 | Jul 27 |
| Oct 9 | Jul 19 | Jul 10 | Jul 28 |
| Oct 10 | Jul 20 | Jul 11 | Jul 29 |
| Oct 11 | Jul 21 | Jul 12 | Jul 30 |
| Oct 12 | Jul 22 | Jul 13 | Jul 31 |
| Oct 13 | Jul 23 | Jul 14 | Aug 1 |
| Oct 14 | Jul 24 | Jul 15 | Aug 2 |
| Oct 15 | Jul 25 | Jul 16 | Aug 3 |
| Oct 16 | Jul 26 | Jul 17 | Aug 4 |
| Oct 17 | Jul 27 | Jul 18 | Aug 5 |
| Oct 18 | Jul 28 | Jul 19 | Aug 6 |
| Oct 19 | Jul 29 | Jul 20 | Aug 7 |
| Oct 20 | Jul 30 | Jul 21 | Aug 8 |
| Oct 21 | Jul 31 | Jul 22 | Aug 9 |
| Oct 22 | Aug 1 | Jul 23 | Aug 10 |
| Oct 23 | Aug 2 | Jul 24 | Aug 11 |
| Oct 24 | Aug 3 | Jul 25 | Aug 12 |
| Oct 25 | Aug 4 | Jul 26 | Aug 13 |
| Oct 26 | Aug 5 | Jul 27 | Aug 14 |
| Oct 27 | Aug 6 | Jul 28 | Aug 15 |
| Oct 28 | Aug 7 | Jul 29 | Aug 16 |
| Oct 29 | Aug 8 | Jul 30 | Aug 17 |
| Oct 30 | Aug 9 | Jul 31 | Aug 18 |
| Oct 31 | Aug 10 | Aug 1 | Aug 19 |
Bred in November
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Nov 1 | Aug 11 | Aug 2 | Aug 20 |
| Nov 2 | Aug 12 | Aug 3 | Aug 21 |
| Nov 3 | Aug 13 | Aug 4 | Aug 22 |
| Nov 4 | Aug 14 | Aug 5 | Aug 23 |
| Nov 5 | Aug 15 | Aug 6 | Aug 24 |
| Nov 6 | Aug 16 | Aug 7 | Aug 25 |
| Nov 7 | Aug 17 | Aug 8 | Aug 26 |
| Nov 8 | Aug 18 | Aug 9 | Aug 27 |
| Nov 9 | Aug 19 | Aug 10 | Aug 28 |
| Nov 10 | Aug 20 | Aug 11 | Aug 29 |
| Nov 11 | Aug 21 | Aug 12 | Aug 30 |
| Nov 12 | Aug 22 | Aug 13 | Aug 31 |
| Nov 13 | Aug 23 | Aug 14 | Sep 1 |
| Nov 14 | Aug 24 | Aug 15 | Sep 2 |
| Nov 15 | Aug 25 | Aug 16 | Sep 3 |
| Nov 16 | Aug 26 | Aug 17 | Sep 4 |
| Nov 17 | Aug 27 | Aug 18 | Sep 5 |
| Nov 18 | Aug 28 | Aug 19 | Sep 6 |
| Nov 19 | Aug 29 | Aug 20 | Sep 7 |
| Nov 20 | Aug 30 | Aug 21 | Sep 8 |
| Nov 21 | Aug 31 | Aug 22 | Sep 9 |
| Nov 22 | Sep 1 | Aug 23 | Sep 10 |
| Nov 23 | Sep 2 | Aug 24 | Sep 11 |
| Nov 24 | Sep 3 | Aug 25 | Sep 12 |
| Nov 25 | Sep 4 | Aug 26 | Sep 13 |
| Nov 26 | Sep 5 | Aug 27 | Sep 14 |
| Nov 27 | Sep 6 | Aug 28 | Sep 15 |
| Nov 28 | Sep 7 | Aug 29 | Sep 16 |
| Nov 29 | Sep 8 | Aug 30 | Sep 17 |
| Nov 30 | Sep 9 | Aug 31 | Sep 18 |
Bred in December
| Bred | Due (283 days) | Earliest (274) | Latest (292) |
|---|
| Dec 1 | Sep 10 | Sep 1 | Sep 19 |
| Dec 2 | Sep 11 | Sep 2 | Sep 20 |
| Dec 3 | Sep 12 | Sep 3 | Sep 21 |
| Dec 4 | Sep 13 | Sep 4 | Sep 22 |
| Dec 5 | Sep 14 | Sep 5 | Sep 23 |
| Dec 6 | Sep 15 | Sep 6 | Sep 24 |
| Dec 7 | Sep 16 | Sep 7 | Sep 25 |
| Dec 8 | Sep 17 | Sep 8 | Sep 26 |
| Dec 9 | Sep 18 | Sep 9 | Sep 27 |
| Dec 10 | Sep 19 | Sep 10 | Sep 28 |
| Dec 11 | Sep 20 | Sep 11 | Sep 29 |
| Dec 12 | Sep 21 | Sep 12 | Sep 30 |
| Dec 13 | Sep 22 | Sep 13 | Oct 1 |
| Dec 14 | Sep 23 | Sep 14 | Oct 2 |
| Dec 15 | Sep 24 | Sep 15 | Oct 3 |
| Dec 16 | Sep 25 | Sep 16 | Oct 4 |
| Dec 17 | Sep 26 | Sep 17 | Oct 5 |
| Dec 18 | Sep 27 | Sep 18 | Oct 6 |
| Dec 19 | Sep 28 | Sep 19 | Oct 7 |
| Dec 20 | Sep 29 | Sep 20 | Oct 8 |
| Dec 21 | Sep 30 | Sep 21 | Oct 9 |
| Dec 22 | Oct 1 | Sep 22 | Oct 10 |
| Dec 23 | Oct 2 | Sep 23 | Oct 11 |
| Dec 24 | Oct 3 | Sep 24 | Oct 12 |
| Dec 25 | Oct 4 | Sep 25 | Oct 13 |
| Dec 26 | Oct 5 | Sep 26 | Oct 14 |
| Dec 27 | Oct 6 | Sep 27 | Oct 15 |
| Dec 28 | Oct 7 | Sep 28 | Oct 16 |
| Dec 29 | Oct 8 | Sep 29 | Oct 17 |
| Dec 30 | Oct 9 | Sep 30 | Oct 18 |
| Dec 31 | Oct 10 | Oct 1 | Oct 19 |
Frequently asked questions
How long is a cow pregnant?
About 283 days, or roughly 9 months and 10 days. Breed averages run from about 279 days for Holsteins to about 292 for Brahman, and individual cows vary about 9 days either side.
How do I read a cow gestation table?
Find the date the cow was bred or inseminated in the left column. The due date column shows the average calving date for that breeding date.
When should I start watching a cow for calving?
From the earliest date in the chart, about 274 days after breeding, and closely in the last week before the due date.
Sources
Calculators for this
Last updated November 10, 2026. Figures are typical values for planning. How we check our data. Found an error? Tell us.