How Long Is a Sheep Pregnant? Ewe Gestation Explained
A sheep is pregnant for about 147 days, just under 5 months. Most ewes lamb between day 142 and day 152. Meat breeds such as Suffolk and Hampshire often lamb a couple of days earlier, around 145 days.
Sheep gestation by breed
| Breed | Typical gestation |
|---|---|
| Suffolk, Hampshire, Dorset, Babydoll Southdown | about 145 days |
| Katahdin, Dorper | about 147 days |
| Merino | about 150 days |
These are averages. Ewes carrying twins or triplets often lamb a few days earlier than ewes carrying a single lamb.
A timeline of what to do when
- Day 0–17: breeding. Ewes cycle about every 17 days, so many flocks leave the ram in for two cycles (about 34 days) to give every ewe two chances.
- Day 45–90: the best window for ultrasound scanning. It confirms pregnancy and shows singles, twins or triplets so you can feed each group correctly.
- Last 6 weeks: most of the lamb's growth happens now. Raise feed quality, especially for ewes carrying multiples.
- About 4 weeks before lambing: ask your vet about a CD&T booster to pass immunity to the lambs.
- Last 1–2 weeks: crutch or shear the ewe, set up clean lambing jugs and watch for udder fill and a softening tail area.
How to work out your ewe's lambing date
Add 147 days to the day the ram went in. If the ram stayed with the flock, use the ram-in and ram-out dates to get the full lambing window, since it covers every possible lambing day. The calculator below does this and adds a pre-lambing checklist you can add to your calendar.
Common questions
How long should the ram stay with the ewes?
Sheep cycle about every 17 days, so two cycles (about 34 days) gives every ewe two chances to be bred and keeps the lambing period to roughly 5 weeks.
Can a ewe lamb early or late?
A few days either side of 147 is normal. Lambs born more than a week early are often weak and need extra care; a ewe well past day 152 should be checked.
Figures are typical values from university extension and breed-association guidance. Estimates only. Individual animals vary — confirm pregnancy and health questions with your veterinarian.