Quick answer
Angus cattle are pregnant for about 279–281 days, a few days less than the 283-day rule. This Angus gestation calculator uses 280 days.
An Angus cow bred on May 1 calves around Feb 5 (283 days would say Feb 8).
How long are Angus cows pregnant?
The Angus gestation period is shorter than most people expect. A Kansas State University analysis of more than 100,000 Angus AI matings from 2000 to 2020 found an average of 278.6 days, with a range of 264 to 292 days. A separate study of about 10,000 beef records averaged 280.2 days, and research from the 1950s put Angus at 281.7 days.
Many calculators and printed charts still use 283 days, which makes Angus calves look “early”. This Angus gestation calculator uses 280 days. If your own herd records show a different average, type it under More options → my own gestation.
Why Angus gestation has got shorter
The same Kansas State study found Angus gestation fell by about 4.3 days over 20 years. The most likely reason is selection: for decades Angus breeders have favoured bulls with low birth weight and high calving ease, and shorter gestation goes hand in hand with smaller calves at birth. Gestation length is strongly inherited, so the bull you use shifts the date.
- Older cows carried slightly longer than young cows in the study.
- Bull calves are carried about a day longer than heifer calves.
- Sire matters: calving-ease bulls tend to sire calves that come a little earlier.
Angus gestation table
Calving dates for every breeding day of the year at 280 days. Find the breeding month along the top and the day down the side.
| Bred | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Oct 8 | Nov 8 | Dec 6 | Jan 6 | Feb 5 | Mar 8 | Apr 7 | May 8 | Jun 8 | Jul 8 | Aug 8 | Sep 7 |
| 2 | Oct 9 | Nov 9 | Dec 7 | Jan 7 | Feb 6 | Mar 9 | Apr 8 | May 9 | Jun 9 | Jul 9 | Aug 9 | Sep 8 |
| 3 | Oct 10 | Nov 10 | Dec 8 | Jan 8 | Feb 7 | Mar 10 | Apr 9 | May 10 | Jun 10 | Jul 10 | Aug 10 | Sep 9 |
| 4 | Oct 11 | Nov 11 | Dec 9 | Jan 9 | Feb 8 | Mar 11 | Apr 10 | May 11 | Jun 11 | Jul 11 | Aug 11 | Sep 10 |
| 5 | Oct 12 | Nov 12 | Dec 10 | Jan 10 | Feb 9 | Mar 12 | Apr 11 | May 12 | Jun 12 | Jul 12 | Aug 12 | Sep 11 |
| 6 | Oct 13 | Nov 13 | Dec 11 | Jan 11 | Feb 10 | Mar 13 | Apr 12 | May 13 | Jun 13 | Jul 13 | Aug 13 | Sep 12 |
| 7 | Oct 14 | Nov 14 | Dec 12 | Jan 12 | Feb 11 | Mar 14 | Apr 13 | May 14 | Jun 14 | Jul 14 | Aug 14 | Sep 13 |
| 8 | Oct 15 | Nov 15 | Dec 13 | Jan 13 | Feb 12 | Mar 15 | Apr 14 | May 15 | Jun 15 | Jul 15 | Aug 15 | Sep 14 |
| 9 | Oct 16 | Nov 16 | Dec 14 | Jan 14 | Feb 13 | Mar 16 | Apr 15 | May 16 | Jun 16 | Jul 16 | Aug 16 | Sep 15 |
| 10 | Oct 17 | Nov 17 | Dec 15 | Jan 15 | Feb 14 | Mar 17 | Apr 16 | May 17 | Jun 17 | Jul 17 | Aug 17 | Sep 16 |
| 11 | Oct 18 | Nov 18 | Dec 16 | Jan 16 | Feb 15 | Mar 18 | Apr 17 | May 18 | Jun 18 | Jul 18 | Aug 18 | Sep 17 |
| 12 | Oct 19 | Nov 19 | Dec 17 | Jan 17 | Feb 16 | Mar 19 | Apr 18 | May 19 | Jun 19 | Jul 19 | Aug 19 | Sep 18 |
| 13 | Oct 20 | Nov 20 | Dec 18 | Jan 18 | Feb 17 | Mar 20 | Apr 19 | May 20 | Jun 20 | Jul 20 | Aug 20 | Sep 19 |
| 14 | Oct 21 | Nov 21 | Dec 19 | Jan 19 | Feb 18 | Mar 21 | Apr 20 | May 21 | Jun 21 | Jul 21 | Aug 21 | Sep 20 |
| 15 | Oct 22 | Nov 22 | Dec 20 | Jan 20 | Feb 19 | Mar 22 | Apr 21 | May 22 | Jun 22 | Jul 22 | Aug 22 | Sep 21 |
| 16 | Oct 23 | Nov 23 | Dec 21 | Jan 21 | Feb 20 | Mar 23 | Apr 22 | May 23 | Jun 23 | Jul 23 | Aug 23 | Sep 22 |
| 17 | Oct 24 | Nov 24 | Dec 22 | Jan 22 | Feb 21 | Mar 24 | Apr 23 | May 24 | Jun 24 | Jul 24 | Aug 24 | Sep 23 |
| 18 | Oct 25 | Nov 25 | Dec 23 | Jan 23 | Feb 22 | Mar 25 | Apr 24 | May 25 | Jun 25 | Jul 25 | Aug 25 | Sep 24 |
| 19 | Oct 26 | Nov 26 | Dec 24 | Jan 24 | Feb 23 | Mar 26 | Apr 25 | May 26 | Jun 26 | Jul 26 | Aug 26 | Sep 25 |
| 20 | Oct 27 | Nov 27 | Dec 25 | Jan 25 | Feb 24 | Mar 27 | Apr 26 | May 27 | Jun 27 | Jul 27 | Aug 27 | Sep 26 |
| 21 | Oct 28 | Nov 28 | Dec 26 | Jan 26 | Feb 25 | Mar 28 | Apr 27 | May 28 | Jun 28 | Jul 28 | Aug 28 | Sep 27 |
| 22 | Oct 29 | Nov 29 | Dec 27 | Jan 27 | Feb 26 | Mar 29 | Apr 28 | May 29 | Jun 29 | Jul 29 | Aug 29 | Sep 28 |
| 23 | Oct 30 | Nov 30 | Dec 28 | Jan 28 | Feb 27 | Mar 30 | Apr 29 | May 30 | Jun 30 | Jul 30 | Aug 30 | Sep 29 |
| 24 | Oct 31 | Dec 1 | Dec 29 | Jan 29 | Feb 28 | Mar 31 | Apr 30 | May 31 | Jul 1 | Jul 31 | Aug 31 | Sep 30 |
| 25 | Nov 1 | Dec 2 | Dec 30 | Jan 30 | Mar 1 | Apr 1 | May 1 | Jun 1 | Jul 2 | Aug 1 | Sep 1 | Oct 1 |
| 26 | Nov 2 | Dec 3 | Dec 31 | Jan 31 | Mar 2 | Apr 2 | May 2 | Jun 2 | Jul 3 | Aug 2 | Sep 2 | Oct 2 |
| 27 | Nov 3 | Dec 4 | Jan 1 | Feb 1 | Mar 3 | Apr 3 | May 3 | Jun 3 | Jul 4 | Aug 3 | Sep 3 | Oct 3 |
| 28 | Nov 4 | Dec 5 | Jan 2 | Feb 2 | Mar 4 | Apr 4 | May 4 | Jun 4 | Jul 5 | Aug 4 | Sep 4 | Oct 4 |
| 29 | Nov 5 | Jan 3 | Feb 3 | Mar 5 | Apr 5 | May 5 | Jun 5 | Jul 6 | Aug 5 | Sep 5 | Oct 5 | |
| 30 | Nov 6 | Jan 4 | Feb 4 | Mar 6 | Apr 6 | May 6 | Jun 6 | Jul 7 | Aug 6 | Sep 6 | Oct 6 | |
| 31 | Nov 7 | Jan 5 | Mar 7 | May 7 | Jun 7 | Aug 7 | Oct 7 |
Need a different year or breed, or a version to print? Use the printable cattle gestation table and pick Angus in the breed menu.
Using the Angus gestation calculator
- Enter the AI or breeding date (or the bull-in and bull-out dates for pasture breeding). The breed is already set to Angus.
- If you used sexed semen or had the calf sexed, set the calf’s sex under More options; for a first-calf heifer, tick the heifer box.
- Read off the Angus calving date, the normal window (±10 days) and her next job. Tap Full pregnancy timeline if you want every date from the heat check to calving.
For Red Angus, pick Red Angus in the breed list (about 282 days). For a crossbred cow, choose the breed of the sire or use your herd’s own average.
Angus heifers: calving dates and calving ease
First-calf Angus heifers are where most calving problems happen, so their due dates matter most:
Breed the heifers two to four weeks ahead of the cows. They calve first, while you still have time to watch them closely, and they get a few extra weeks to recover before the next breeding season.
Most people put heifers to a calving-ease bull with a low birth-weight EPD. Those bulls often shorten gestation a little too, so start checking heifers about 10 days before their due date rather than on it.
Once a heifer starts calving, give her an hour from the moment the water bag or feet show. If she hasn’t made real progress by then, she needs help. (For a mature cow, the limit is about 30 minutes.) And feed heifers apart from the cow herd if you can. They’re still growing, and a heifer that calves thin is the hardest animal on the place to get bred back.
Black Angus, Red Angus and Angus crosses
| Cattle | Typical gestation | Notes |
|---|---|---|
| Black Angus | about 279–281 days | Calculator uses 280 |
| Red Angus | about 282 days | Choose Red Angus in the breed list |
| Black Baldy (Angus × Hereford) | about 282–283 days | Between the two parent breeds |
| Angus × Simmental (SimAngus) | about 283–285 days | Continental genetics add a few days |
| Angus-sired calves out of dairy cows | about 279–281 days | Beef-on-dairy: both breeds are short |
Crossbred figures are approximate; the calf’s sire has the biggest influence.
Planning an Angus calving season
Because Angus cows calve a few days earlier than the 283-day rule, a calving season planned with 283 days starts about 3 days “early”. Count back 280 days from your target calving date instead: for Angus calves from March 1, turn the bull in or start AI around May 25. The calving calculator plans the whole season with 21-day periods.
Angus gestation FAQ
How long is the Angus gestation period?
About 279–281 days in modern Angus cattle. A Kansas State University study of more than 100,000 Angus AI matings averaged 278.6 days, with most calves born between about 270 and 288 days.
Do Angus cows calve early?
Compared with the 283-day rule, yes, usually by 2–4 days. Compared with their own breed average, no: most Angus cows calve within about 5 days of 280 days.
How do I calculate an Angus calving date?
Add 280 days to the breeding date. An Angus cow bred on May 1 calves around Feb 5. The Angus gestation calculator above does it for you and shows the normal window.
Is Red Angus gestation the same as Black Angus?
Very similar. Red Angus averages about 282 days in this calculator, within a day or two of Black Angus.
How long is an Angus heifer pregnant?
About the same as an Angus cow, or a day shorter. Young heifers bred to calving-ease bulls often calve a little before the average date.
Last updated October 21, 2026 · Every date on this page comes from the same data the calculators use.