A cow pregnancy lasts about 283 days from the breeding date, which is 9 months and 13 days (months of 30 days); most births fall between day 279 and day 287. Day 0 is the breeding date, so month 1 is days 0 to 29, month 2 is days 30 to 59, and so on.
How far along is your cow? Pick the breeding date: the calculator shows which day she is on, the days to go and every date on her schedule.
Bred on
Length (days)
283
Average: 283 days. Adjust it for your breed.
Due date
Thu, Dec 9, 2027
Usually Dec 5 – Dec 13, 2027
Milestones
💕
Bred
Day 0 · Mon, Mar 1, 2027
⏳
Halfway
Day 141 · Tue, Jul 20, 2027
🧺
About a week to go: get a clean, quiet birthing area ready
Day 276 · Thu, Dec 2, 2027
🎉
Due date (calving)
Day 283 · Thu, Dec 9, 2027
Month by month: days and dates
Dates for a cow bred on Mar 1, 2027. Pick your own breeding date in the calculator above.
Day 276: About a week to go: get a clean, quiet birthing area ready · Day 279: Earliest usual date · Day 283: Due date (calving) · Day 287: Latest usual date
Month 1 (days 0–29): breeding
Day 0 is the breeding date. If she was bred on several days, the calculator counts from the first breeding and the usual window runs to the last breeding + 287 days.
Breeds differ by several days, and cows carrying bull calves tend to calve a little later than those carrying heifer calves (University of Nebraska–Lincoln).
Months 2 to 4 (days 30–119)
Nothing on the schedule until day 141 (halfway, month 5). By day 119, 164 days are left to the due date.
Month 5 (days 120–149): halfway
Day 141 (Jul 20, 2027) is halfway through a 283-day pregnancy. From here, 142 days are left to the due date.
Months 6 to 9 (days 150–269)
Nothing on the schedule until day 276 (a week to go, month 10). By day 269, 14 days are left to the due date.
Month 10 (days 270–287): a week to go, the usual window opens, the due date and the usual window closes
Day 276 (Dec 2, 2027) is one week before the due date. The schedule’s reminder for this day: get a clean, quiet birthing area ready.
Day 279 (Dec 5, 2027) is the earliest usual date: from here on, a birth is inside the usual range.
Day 283 (Dec 9, 2027) is the due date, the average length counted from breeding. It is an estimate; most births fall between day 279 and day 287.
Day 287 (Dec 13, 2027) is the latest usual date. If that day passes, or anything about the mother worries you, call your veterinarian.
Frequently asked questions
How far along is my cow?
Count the days since the breeding date (the first one, if she was bred more than once). Days 0 to 29 are month 1, days 30 to 59 are month 2, and so on: day 141 is in month 5 and the due date, day 283, is in month 10. The calculator above counts it for you.
How many months is a cow pregnant?
About 283 days, which is 9 months and 13 days. Most births fall between day 279 and day 287 (month 10).
When should the birthing area be ready?
The schedule marks day 276 (month 10), one week before the due date: get a clean, quiet birthing area ready. For a cow bred on Mar 1, 2027, that is Dec 2, 2027.
Where the numbers come from
Sources: University of Nebraska–Lincoln Beef: Pregnant cows. Breeds and individual animals differ; change the length in the calculator if yours usually runs early or late. These dates are estimates, not veterinary advice: ask your veterinarian about your animal.