How Long Are Sheep Pregnant? Gestation, Lambing Signs and Preparation

If you're breeding sheep, this guide covers when to expect lambs and the signs that lambing is close, drawing on Penn State Extension's lambing-season guidance. It's general information, not a substitute for your vet.

Gestation: about 147 days

Sheep gestation runs about 147 days on average — close to five months. Penn State Extension gives a range of 144 to 150 days from mating. Our due-date calculator shows the expected date alongside an earliest and latest date, since individual ewes vary within that window.

Body condition matters before lambing

Extension guidance recommends ewes be at a body condition score of 3 to 3.5 on a 5-point scale going into lambing, with the energy density of the ration increased during the last third of pregnancy — this helps prevent pregnancy toxemia, a real risk when a ewe's nutrition doesn't keep pace with a growing lamb's demands. Lambing supplies should be assembled in advance, and ewes moved to a monitored area several weeks before the expected due date.

The signs that lambing is close

In the days before lambing, a ewe's vulva changes from light pink to a darker pink and begins to swell, with the muscles around the vulva and hips relaxing. The udder becomes full, tight and hard with colostrum. Behaviourally, ewes tend to move off by themselves and stop eating as lambing draws close — worth watching for at feeding time specifically, since a ewe skipping the trough is a noticeable change from normal flock behaviour.

What this guide doesn't cover

Penn State Extension's lambing-season guidance focuses on preparation and the signs of impending lambing rather than giving a specific timeline for the stages of labour itself or how long lambing typically takes once it starts — we haven't found that level of detail from a source meeting this site's bar, so we're not guessing at it here.

Before you breed

Lambs multiply space, feed and cost — see our space guide for how much more room a ewe with lambs at foot needs, and use plan my setup to model the numbers for your flock after lambing, not just the ewe alone.

Source: Penn State Extension, “Preparing for Lambing Season”: extension.psu.edu. Gestation range cross-checked against DEFRA/OSU sheep sources already cited for this site's sheep housing figures. Sources checked: September 2026. General information, not veterinary advice.

Common questions

How long is a sheep pregnant?

About 147 days on average, with Penn State Extension citing a range of 144 to 150 days — close to five months from mating.

What are the signs a ewe is about to lamb?

The vulva changes from light pink to dark pink and begins to swell, with the muscles around it and the hips relaxing. The udder becomes tight and hard with colostrum. Ewes tend to move off by themselves and stop eating as lambing gets close.

What body condition should a ewe be in before lambing?

Penn State Extension recommends a body condition score of 3 to 3.5 on a 5-point scale before lambing, with increased feed energy density during the last third of pregnancy to help prevent pregnancy toxemia.