The whole year: the day she was bred, and the day she is due.
Sheep carry about 147 days — just under 5 months. Find the day she was bred in the chart and read her due date beside it. Most sheep have their lambs from 3 days before to 5 days after that date (day 144 to day 152).
Counted 147 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
May 28
Jan 2
May 29
Jan 3
May 30
Jan 4
May 31
Jan 5
Jun 1
Jan 6
Jun 2
Jan 7
Jun 3
Jan 8
Jun 4
Jan 9
Jun 5
Jan 10
Jun 6
Jan 11
Jun 7
Jan 12
Jun 8
Jan 13
Jun 9
Jan 14
Jun 10
Jan 15
Jun 11
Jan 16
Jun 12
Jan 17
Jun 13
Jan 18
Jun 14
Jan 19
Jun 15
Jan 20
Jun 16
Jan 21
Jun 17
Jan 22
Jun 18
Jan 23
Jun 19
Jan 24
Jun 20
Jan 25
Jun 21
Jan 26
Jun 22
Jan 27
Jun 23
Jan 28
Jun 24
Jan 29
Jun 25
Jan 30
Jun 26
Jan 31
Jun 27
Bred in February
Bred
Due
Feb 1
Jun 28
Feb 2
Jun 29
Feb 3
Jun 30
Feb 4
Jul 1
Feb 5
Jul 2
Feb 6
Jul 3
Feb 7
Jul 4
Feb 8
Jul 5
Feb 9
Jul 6
Feb 10
Jul 7
Feb 11
Jul 8
Feb 12
Jul 9
Feb 13
Jul 10
Feb 14
Jul 11
Feb 15
Jul 12
Feb 16
Jul 13
Feb 17
Jul 14
Feb 18
Jul 15
Feb 19
Jul 16
Feb 20
Jul 17
Feb 21
Jul 18
Feb 22
Jul 19
Feb 23
Jul 20
Feb 24
Jul 21
Feb 25
Jul 22
Feb 26
Jul 23
Feb 27
Jul 24
Feb 28
Jul 25
Bred in March
Bred
Due
Mar 1
Jul 26
Mar 2
Jul 27
Mar 3
Jul 28
Mar 4
Jul 29
Mar 5
Jul 30
Mar 6
Jul 31
Mar 7
Aug 1
Mar 8
Aug 2
Mar 9
Aug 3
Mar 10
Aug 4
Mar 11
Aug 5
Mar 12
Aug 6
Mar 13
Aug 7
Mar 14
Aug 8
Mar 15
Aug 9
Mar 16
Aug 10
Mar 17
Aug 11
Mar 18
Aug 12
Mar 19
Aug 13
Mar 20
Aug 14
Mar 21
Aug 15
Mar 22
Aug 16
Mar 23
Aug 17
Mar 24
Aug 18
Mar 25
Aug 19
Mar 26
Aug 20
Mar 27
Aug 21
Mar 28
Aug 22
Mar 29
Aug 23
Mar 30
Aug 24
Mar 31
Aug 25
Bred in April
Bred
Due
Apr 1
Aug 26
Apr 2
Aug 27
Apr 3
Aug 28
Apr 4
Aug 29
Apr 5
Aug 30
Apr 6
Aug 31
Apr 7
Sep 1
Apr 8
Sep 2
Apr 9
Sep 3
Apr 10
Sep 4
Apr 11
Sep 5
Apr 12
Sep 6
Apr 13
Sep 7
Apr 14
Sep 8
Apr 15
Sep 9
Apr 16
Sep 10
Apr 17
Sep 11
Apr 18
Sep 12
Apr 19
Sep 13
Apr 20
Sep 14
Apr 21
Sep 15
Apr 22
Sep 16
Apr 23
Sep 17
Apr 24
Sep 18
Apr 25
Sep 19
Apr 26
Sep 20
Apr 27
Sep 21
Apr 28
Sep 22
Apr 29
Sep 23
Apr 30
Sep 24
Bred in May
Bred
Due
May 1
Sep 25
May 2
Sep 26
May 3
Sep 27
May 4
Sep 28
May 5
Sep 29
May 6
Sep 30
May 7
Oct 1
May 8
Oct 2
May 9
Oct 3
May 10
Oct 4
May 11
Oct 5
May 12
Oct 6
May 13
Oct 7
May 14
Oct 8
May 15
Oct 9
May 16
Oct 10
May 17
Oct 11
May 18
Oct 12
May 19
Oct 13
May 20
Oct 14
May 21
Oct 15
May 22
Oct 16
May 23
Oct 17
May 24
Oct 18
May 25
Oct 19
May 26
Oct 20
May 27
Oct 21
May 28
Oct 22
May 29
Oct 23
May 30
Oct 24
May 31
Oct 25
Bred in June
Bred
Due
Jun 1
Oct 26
Jun 2
Oct 27
Jun 3
Oct 28
Jun 4
Oct 29
Jun 5
Oct 30
Jun 6
Oct 31
Jun 7
Nov 1
Jun 8
Nov 2
Jun 9
Nov 3
Jun 10
Nov 4
Jun 11
Nov 5
Jun 12
Nov 6
Jun 13
Nov 7
Jun 14
Nov 8
Jun 15
Nov 9
Jun 16
Nov 10
Jun 17
Nov 11
Jun 18
Nov 12
Jun 19
Nov 13
Jun 20
Nov 14
Jun 21
Nov 15
Jun 22
Nov 16
Jun 23
Nov 17
Jun 24
Nov 18
Jun 25
Nov 19
Jun 26
Nov 20
Jun 27
Nov 21
Jun 28
Nov 22
Jun 29
Nov 23
Jun 30
Nov 24
Bred in July
Bred
Due
Jul 1
Nov 25
Jul 2
Nov 26
Jul 3
Nov 27
Jul 4
Nov 28
Jul 5
Nov 29
Jul 6
Nov 30
Jul 7
Dec 1
Jul 8
Dec 2
Jul 9
Dec 3
Jul 10
Dec 4
Jul 11
Dec 5
Jul 12
Dec 6
Jul 13
Dec 7
Jul 14
Dec 8
Jul 15
Dec 9
Jul 16
Dec 10
Jul 17
Dec 11
Jul 18
Dec 12
Jul 19
Dec 13
Jul 20
Dec 14
Jul 21
Dec 15
Jul 22
Dec 16
Jul 23
Dec 17
Jul 24
Dec 18
Jul 25
Dec 19
Jul 26
Dec 20
Jul 27
Dec 21
Jul 28
Dec 22
Jul 29
Dec 23
Jul 30
Dec 24
Jul 31
Dec 25
Bred in August
Bred
Due
Aug 1
Dec 26
Aug 2
Dec 27
Aug 3
Dec 28
Aug 4
Dec 29
Aug 5
Dec 30
Aug 6
Dec 31
Aug 7
Jan 1
Aug 8
Jan 2
Aug 9
Jan 3
Aug 10
Jan 4
Aug 11
Jan 5
Aug 12
Jan 6
Aug 13
Jan 7
Aug 14
Jan 8
Aug 15
Jan 9
Aug 16
Jan 10
Aug 17
Jan 11
Aug 18
Jan 12
Aug 19
Jan 13
Aug 20
Jan 14
Aug 21
Jan 15
Aug 22
Jan 16
Aug 23
Jan 17
Aug 24
Jan 18
Aug 25
Jan 19
Aug 26
Jan 20
Aug 27
Jan 21
Aug 28
Jan 22
Aug 29
Jan 23
Aug 30
Jan 24
Aug 31
Jan 25
Bred in September
Bred
Due
Sep 1
Jan 26
Sep 2
Jan 27
Sep 3
Jan 28
Sep 4
Jan 29
Sep 5
Jan 30
Sep 6
Jan 31
Sep 7
Feb 1
Sep 8
Feb 2
Sep 9
Feb 3
Sep 10
Feb 4
Sep 11
Feb 5
Sep 12
Feb 6
Sep 13
Feb 7
Sep 14
Feb 8
Sep 15
Feb 9
Sep 16
Feb 10
Sep 17
Feb 11
Sep 18
Feb 12
Sep 19
Feb 13
Sep 20
Feb 14
Sep 21
Feb 15
Sep 22
Feb 16
Sep 23
Feb 17
Sep 24
Feb 18
Sep 25
Feb 19
Sep 26
Feb 20
Sep 27
Feb 21
Sep 28
Feb 22
Sep 29
Feb 23
Sep 30
Feb 24
Bred in October
Bred
Due
Oct 1
Feb 25
Oct 2
Feb 26
Oct 3
Feb 27
Oct 4
Feb 28
Oct 5
Mar 1
Oct 6
Mar 2
Oct 7
Mar 3
Oct 8
Mar 4
Oct 9
Mar 5
Oct 10
Mar 6
Oct 11
Mar 7
Oct 12
Mar 8
Oct 13
Mar 9
Oct 14
Mar 10
Oct 15
Mar 11
Oct 16
Mar 12
Oct 17
Mar 13
Oct 18
Mar 14
Oct 19
Mar 15
Oct 20
Mar 16
Oct 21
Mar 17
Oct 22
Mar 18
Oct 23
Mar 19
Oct 24
Mar 20
Oct 25
Mar 21
Oct 26
Mar 22
Oct 27
Mar 23
Oct 28
Mar 24
Oct 29
Mar 25
Oct 30
Mar 26
Oct 31
Mar 27
Bred in November
Bred
Due
Nov 1
Mar 28
Nov 2
Mar 29
Nov 3
Mar 30
Nov 4
Mar 31
Nov 5
Apr 1
Nov 6
Apr 2
Nov 7
Apr 3
Nov 8
Apr 4
Nov 9
Apr 5
Nov 10
Apr 6
Nov 11
Apr 7
Nov 12
Apr 8
Nov 13
Apr 9
Nov 14
Apr 10
Nov 15
Apr 11
Nov 16
Apr 12
Nov 17
Apr 13
Nov 18
Apr 14
Nov 19
Apr 15
Nov 20
Apr 16
Nov 21
Apr 17
Nov 22
Apr 18
Nov 23
Apr 19
Nov 24
Apr 20
Nov 25
Apr 21
Nov 26
Apr 22
Nov 27
Apr 23
Nov 28
Apr 24
Nov 29
Apr 25
Nov 30
Apr 26
Bred in December
Bred
Due
Dec 1
Apr 27
Dec 2
Apr 28
Dec 3
Apr 29
Dec 4
Apr 30
Dec 5
May 1
Dec 6
May 2
Dec 7
May 3
Dec 8
May 4
Dec 9
May 5
Dec 10
May 6
Dec 11
May 7
Dec 12
May 8
Dec 13
May 9
Dec 14
May 10
Dec 15
May 11
Dec 16
May 12
Dec 17
May 13
Dec 18
May 14
Dec 19
May 15
Dec 20
May 16
Dec 21
May 17
Dec 22
May 18
Dec 23
May 19
Dec 24
May 20
Dec 25
May 21
Dec 26
May 22
Dec 27
May 23
Dec 28
May 24
Dec 29
May 25
Dec 30
May 26
Dec 31
May 27
Questions
How do I read a sheep gestation chart?
Find the month and the day she was bred; the date beside it is her due date. A ewe bred on January 1 is due about May 28.
Why is there a window around the due date?
No two sheep are the same. Most give birth from 3 days before to 5 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 147 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 ram 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.