The whole year: the day she was bred, and the day she is due.
Cattle carry about 283 days — about 9 months. Find the day she was bred in the chart and read her due date beside it. Most cattle have their calves from 4 days before to 4 days after that date (day 279 to day 287).
Counted 283 days from the breeding day, the way online calculators count. Some printed tables count the breeding day as day 1 and show one day earlier — both are inside her window.
In a year when February 29 falls between the breeding and the birth, her due date is one day earlier than the chart shows.
A common guide — your vet’s plan wins.
Bred on → due on
Bred in January
Bred
Due
Jan 1
Oct 11
Jan 2
Oct 12
Jan 3
Oct 13
Jan 4
Oct 14
Jan 5
Oct 15
Jan 6
Oct 16
Jan 7
Oct 17
Jan 8
Oct 18
Jan 9
Oct 19
Jan 10
Oct 20
Jan 11
Oct 21
Jan 12
Oct 22
Jan 13
Oct 23
Jan 14
Oct 24
Jan 15
Oct 25
Jan 16
Oct 26
Jan 17
Oct 27
Jan 18
Oct 28
Jan 19
Oct 29
Jan 20
Oct 30
Jan 21
Oct 31
Jan 22
Nov 1
Jan 23
Nov 2
Jan 24
Nov 3
Jan 25
Nov 4
Jan 26
Nov 5
Jan 27
Nov 6
Jan 28
Nov 7
Jan 29
Nov 8
Jan 30
Nov 9
Jan 31
Nov 10
Bred in February
Bred
Due
Feb 1
Nov 11
Feb 2
Nov 12
Feb 3
Nov 13
Feb 4
Nov 14
Feb 5
Nov 15
Feb 6
Nov 16
Feb 7
Nov 17
Feb 8
Nov 18
Feb 9
Nov 19
Feb 10
Nov 20
Feb 11
Nov 21
Feb 12
Nov 22
Feb 13
Nov 23
Feb 14
Nov 24
Feb 15
Nov 25
Feb 16
Nov 26
Feb 17
Nov 27
Feb 18
Nov 28
Feb 19
Nov 29
Feb 20
Nov 30
Feb 21
Dec 1
Feb 22
Dec 2
Feb 23
Dec 3
Feb 24
Dec 4
Feb 25
Dec 5
Feb 26
Dec 6
Feb 27
Dec 7
Feb 28
Dec 8
Bred in March
Bred
Due
Mar 1
Dec 9
Mar 2
Dec 10
Mar 3
Dec 11
Mar 4
Dec 12
Mar 5
Dec 13
Mar 6
Dec 14
Mar 7
Dec 15
Mar 8
Dec 16
Mar 9
Dec 17
Mar 10
Dec 18
Mar 11
Dec 19
Mar 12
Dec 20
Mar 13
Dec 21
Mar 14
Dec 22
Mar 15
Dec 23
Mar 16
Dec 24
Mar 17
Dec 25
Mar 18
Dec 26
Mar 19
Dec 27
Mar 20
Dec 28
Mar 21
Dec 29
Mar 22
Dec 30
Mar 23
Dec 31
Mar 24
Jan 1
Mar 25
Jan 2
Mar 26
Jan 3
Mar 27
Jan 4
Mar 28
Jan 5
Mar 29
Jan 6
Mar 30
Jan 7
Mar 31
Jan 8
Bred in April
Bred
Due
Apr 1
Jan 9
Apr 2
Jan 10
Apr 3
Jan 11
Apr 4
Jan 12
Apr 5
Jan 13
Apr 6
Jan 14
Apr 7
Jan 15
Apr 8
Jan 16
Apr 9
Jan 17
Apr 10
Jan 18
Apr 11
Jan 19
Apr 12
Jan 20
Apr 13
Jan 21
Apr 14
Jan 22
Apr 15
Jan 23
Apr 16
Jan 24
Apr 17
Jan 25
Apr 18
Jan 26
Apr 19
Jan 27
Apr 20
Jan 28
Apr 21
Jan 29
Apr 22
Jan 30
Apr 23
Jan 31
Apr 24
Feb 1
Apr 25
Feb 2
Apr 26
Feb 3
Apr 27
Feb 4
Apr 28
Feb 5
Apr 29
Feb 6
Apr 30
Feb 7
Bred in May
Bred
Due
May 1
Feb 8
May 2
Feb 9
May 3
Feb 10
May 4
Feb 11
May 5
Feb 12
May 6
Feb 13
May 7
Feb 14
May 8
Feb 15
May 9
Feb 16
May 10
Feb 17
May 11
Feb 18
May 12
Feb 19
May 13
Feb 20
May 14
Feb 21
May 15
Feb 22
May 16
Feb 23
May 17
Feb 24
May 18
Feb 25
May 19
Feb 26
May 20
Feb 27
May 21
Feb 28
May 22
Mar 1
May 23
Mar 2
May 24
Mar 3
May 25
Mar 4
May 26
Mar 5
May 27
Mar 6
May 28
Mar 7
May 29
Mar 8
May 30
Mar 9
May 31
Mar 10
Bred in June
Bred
Due
Jun 1
Mar 11
Jun 2
Mar 12
Jun 3
Mar 13
Jun 4
Mar 14
Jun 5
Mar 15
Jun 6
Mar 16
Jun 7
Mar 17
Jun 8
Mar 18
Jun 9
Mar 19
Jun 10
Mar 20
Jun 11
Mar 21
Jun 12
Mar 22
Jun 13
Mar 23
Jun 14
Mar 24
Jun 15
Mar 25
Jun 16
Mar 26
Jun 17
Mar 27
Jun 18
Mar 28
Jun 19
Mar 29
Jun 20
Mar 30
Jun 21
Mar 31
Jun 22
Apr 1
Jun 23
Apr 2
Jun 24
Apr 3
Jun 25
Apr 4
Jun 26
Apr 5
Jun 27
Apr 6
Jun 28
Apr 7
Jun 29
Apr 8
Jun 30
Apr 9
Bred in July
Bred
Due
Jul 1
Apr 10
Jul 2
Apr 11
Jul 3
Apr 12
Jul 4
Apr 13
Jul 5
Apr 14
Jul 6
Apr 15
Jul 7
Apr 16
Jul 8
Apr 17
Jul 9
Apr 18
Jul 10
Apr 19
Jul 11
Apr 20
Jul 12
Apr 21
Jul 13
Apr 22
Jul 14
Apr 23
Jul 15
Apr 24
Jul 16
Apr 25
Jul 17
Apr 26
Jul 18
Apr 27
Jul 19
Apr 28
Jul 20
Apr 29
Jul 21
Apr 30
Jul 22
May 1
Jul 23
May 2
Jul 24
May 3
Jul 25
May 4
Jul 26
May 5
Jul 27
May 6
Jul 28
May 7
Jul 29
May 8
Jul 30
May 9
Jul 31
May 10
Bred in August
Bred
Due
Aug 1
May 11
Aug 2
May 12
Aug 3
May 13
Aug 4
May 14
Aug 5
May 15
Aug 6
May 16
Aug 7
May 17
Aug 8
May 18
Aug 9
May 19
Aug 10
May 20
Aug 11
May 21
Aug 12
May 22
Aug 13
May 23
Aug 14
May 24
Aug 15
May 25
Aug 16
May 26
Aug 17
May 27
Aug 18
May 28
Aug 19
May 29
Aug 20
May 30
Aug 21
May 31
Aug 22
Jun 1
Aug 23
Jun 2
Aug 24
Jun 3
Aug 25
Jun 4
Aug 26
Jun 5
Aug 27
Jun 6
Aug 28
Jun 7
Aug 29
Jun 8
Aug 30
Jun 9
Aug 31
Jun 10
Bred in September
Bred
Due
Sep 1
Jun 11
Sep 2
Jun 12
Sep 3
Jun 13
Sep 4
Jun 14
Sep 5
Jun 15
Sep 6
Jun 16
Sep 7
Jun 17
Sep 8
Jun 18
Sep 9
Jun 19
Sep 10
Jun 20
Sep 11
Jun 21
Sep 12
Jun 22
Sep 13
Jun 23
Sep 14
Jun 24
Sep 15
Jun 25
Sep 16
Jun 26
Sep 17
Jun 27
Sep 18
Jun 28
Sep 19
Jun 29
Sep 20
Jun 30
Sep 21
Jul 1
Sep 22
Jul 2
Sep 23
Jul 3
Sep 24
Jul 4
Sep 25
Jul 5
Sep 26
Jul 6
Sep 27
Jul 7
Sep 28
Jul 8
Sep 29
Jul 9
Sep 30
Jul 10
Bred in October
Bred
Due
Oct 1
Jul 11
Oct 2
Jul 12
Oct 3
Jul 13
Oct 4
Jul 14
Oct 5
Jul 15
Oct 6
Jul 16
Oct 7
Jul 17
Oct 8
Jul 18
Oct 9
Jul 19
Oct 10
Jul 20
Oct 11
Jul 21
Oct 12
Jul 22
Oct 13
Jul 23
Oct 14
Jul 24
Oct 15
Jul 25
Oct 16
Jul 26
Oct 17
Jul 27
Oct 18
Jul 28
Oct 19
Jul 29
Oct 20
Jul 30
Oct 21
Jul 31
Oct 22
Aug 1
Oct 23
Aug 2
Oct 24
Aug 3
Oct 25
Aug 4
Oct 26
Aug 5
Oct 27
Aug 6
Oct 28
Aug 7
Oct 29
Aug 8
Oct 30
Aug 9
Oct 31
Aug 10
Bred in November
Bred
Due
Nov 1
Aug 11
Nov 2
Aug 12
Nov 3
Aug 13
Nov 4
Aug 14
Nov 5
Aug 15
Nov 6
Aug 16
Nov 7
Aug 17
Nov 8
Aug 18
Nov 9
Aug 19
Nov 10
Aug 20
Nov 11
Aug 21
Nov 12
Aug 22
Nov 13
Aug 23
Nov 14
Aug 24
Nov 15
Aug 25
Nov 16
Aug 26
Nov 17
Aug 27
Nov 18
Aug 28
Nov 19
Aug 29
Nov 20
Aug 30
Nov 21
Aug 31
Nov 22
Sep 1
Nov 23
Sep 2
Nov 24
Sep 3
Nov 25
Sep 4
Nov 26
Sep 5
Nov 27
Sep 6
Nov 28
Sep 7
Nov 29
Sep 8
Nov 30
Sep 9
Bred in December
Bred
Due
Dec 1
Sep 10
Dec 2
Sep 11
Dec 3
Sep 12
Dec 4
Sep 13
Dec 5
Sep 14
Dec 6
Sep 15
Dec 7
Sep 16
Dec 8
Sep 17
Dec 9
Sep 18
Dec 10
Sep 19
Dec 11
Sep 20
Dec 12
Sep 21
Dec 13
Sep 22
Dec 14
Sep 23
Dec 15
Sep 24
Dec 16
Sep 25
Dec 17
Sep 26
Dec 18
Sep 27
Dec 19
Sep 28
Dec 20
Sep 29
Dec 21
Sep 30
Dec 22
Oct 1
Dec 23
Oct 2
Dec 24
Oct 3
Dec 25
Oct 4
Dec 26
Oct 5
Dec 27
Oct 6
Dec 28
Oct 7
Dec 29
Oct 8
Dec 30
Oct 9
Dec 31
Oct 10
Questions
How do I read a cow gestation chart?
Find the month and the day she was bred; the date beside it is her due date. A cow bred on January 1 is due about October 11.
Why is there a window around the due date?
No two cattle are the same. Most give birth from 4 days before to 4 days after the date in the chart, so start watching her at the beginning of that window.
Why does another chart say one day earlier?
Counted 283 days from the breeding day, the way online calculators count. Some printed tables count the breeding day as day 1 and show one day earlier — both are inside her window.
What if she was with the bull for weeks?
Read the chart for the first and the last day they were together: she is due between those two dates, give or take her window. The calculator does this for you.
Does her breed change the chart?
By a few days: Holstein cows average 279 days and Brahman cows 292. This chart uses 283; the calculator moves the date for her breed.