Olive Egger chickens are not a standardized breed. They are colored-egg hybrids created by combining blue-shell genetics with brown-shell genetics, usually from a blue-egg parent such as an Ameraucana, Araucana, or Cream Legbar and a brown-egg parent such as a Marans or Welsummer.
That mixed background is exactly why Olive Eggers are so interesting. One hen may lay a soft sage egg, another may lay mossy green, and a carefully bred line may produce a much darker olive shell. The birds themselves can also look completely different from one another.
The important thing is to stop treating “Olive Egger” like a fixed breed name. Egg color, size, temperament, comb type, leg color, feathering, broodiness, and climate tolerance all depend heavily on the parent lines and the generation of the cross.
Olive Egger Chicken at a Glance
| Type | Hybrid / colored-egg breeding project |
|---|---|
| APA recognized? | No |
| Primary use | Colored eggs |
| Egg color | Olive, khaki, moss, sage, green-brown; later generations may vary more widely |
| Approx. egg production | Often around 150–200 eggs/year; some selected lines may differ |
| Egg size | Usually medium to large, depending on parentage |
| Broodiness | Variable |
| Temperament | Variable; strongly influenced by parent breeds |
| Adult size | Variable; many common lines are medium-sized |
| Climate tolerance | Depends on the cross |
| Best known for | Olive-green eggs and wide genetic variety |
What Is an Olive Egger Chicken?
An Olive Egger is a chicken bred to combine a genetically blue shell with enough brown pigment to make the finished egg look olive green.
Common parent combinations include Ameraucana or Cream Legbar on the blue-egg side and Marans or Welsummer on the brown-egg side. Those are examples, not rules. Breeders can use other lines as long as the genetics support the shell color they are trying to produce.
Because there is no official Olive Egger standard, two hatcheries can sell birds under the same name and produce noticeably different chickens.
How Olive Egg Color Works
The easiest way to picture an olive egg is this: start with a blue shell, then add brown pigment over it.
Blue-shell chickens carry genetics associated with deposition of biliverdin in the shell. Research has identified the SLCO1B3 region as a major part of the blue-eggshell mechanism. Brown shells, meanwhile, get much of their color from protoporphyrin IX.
When those pigment systems combine, the shell can look green or olive. More brown pigment over the blue base generally pushes the color toward khaki, moss, or darker olive. Less brown pigment leaves a lighter green appearance.
This also explains why egg color can fade during a laying cycle. The blue-shell base is genetically determined, but the intensity of the brown surface pigment can change. A hen may lay darker eggs after a break and somewhat lighter ones later in a long laying run.
Once a hen starts laying, she normally keeps the same basic shell-color type. She does not usually lay olive one day, blue the next, and brown the day after. What changes most is shade and pigment intensity.
F1 vs. F2 Olive Eggers
This is where Olive Egger breeding gets much more interesting than a simple breed profile.
F1 Olive Eggers
F1 means first generation. A breeder crosses a blue-egg line with a brown-egg line and selects for the combination needed to produce olive shells.
If the blue-shell parent reliably passes the blue-shell allele and the brown-egg parent contributes strong brown pigment, F1 pullets can be fairly predictable compared with later generations.
Even then, “Ameraucana × Marans” does not guarantee one exact shade. Brown shell color is influenced by multiple genes, and not every parent lays the same depth of brown.
F2 Olive Eggers
F2 birds come from breeding Olive Egger genetics into another generation. At that point, traits begin to segregate more widely.
That means an F2 flock can produce a broader mix of shell colors. Depending on the breeding program, daughters may lay olive, green, blue-green, blue, brown, or chocolate-influenced eggs. Current F2 programs from commercial hatcheries openly describe this wider variation.
If your goal is a guaranteed basket of olive eggs, ask the breeder what generation the birds are and what the parent hens actually lay.
Backcrossing for Darker Olive Eggs
Breeders often backcross an Olive Egger to a strong dark-brown line when they want to push the shell toward deeper olive. The challenge is keeping the blue-shell genetics while increasing the brown overlay.
That is why serious Olive Egger breeding is more than simply putting two attractive birds together. The best results come from tracking which hens lay which eggs and selecting breeders from known lines.
What Color Eggs Do Olive Eggers Lay?
There is no single official Olive Egger shade.
You may see eggs described as olive, khaki, moss, sage, army green, or green-brown. Some carry speckles or a darker surface bloom. Later-generation birds can produce even wider variation.
The darkest olive eggs usually come from birds that inherited a blue shell base plus strong brown pigment from a carefully selected dark-egg line.
If shell color matters more to you than anything else, buy from a breeder who shows eggs from the actual parent flock. A breed-name list alone cannot tell you how dark the daughters will lay.
For other green-shell options, see my guide to chickens that lay green eggs.
How Many Eggs Do Olive Eggers Lay?
There is no universal production number because Olive Eggers are not one fixed genetic line.
For many backyard Olive Eggers, about 150 to 200 eggs per year is a sensible expectation. Some selected production lines may do better, while heavier heritage-style crosses may lay less.
One current commercial F1 Olive Egger line is estimated at about 180 to 200 eggs per year, while its F2 line is estimated around 150 to 220. Those are useful examples of how one breeder’s strain performs, not a standard for every Olive Egger.
Pullets commonly begin laying somewhere around 5 to 7 months, but parentage and season matter. A fast-maturing Legbar-based cross may start earlier than a heavier Marans-based bird.
Molting and short winter days can reduce production just as they do in other hens. I would not promise year-round 4-to-5-egg weeks from every Olive Egger.
Broodiness
Broodiness is variable because the parents are variable.
A cross from lines with little broodiness may rarely sit. An Olive Egger carrying stronger broody tendencies from its background may decide to hatch. Current hatchery lines themselves range from “variable” to “somewhat setter.”
If uninterrupted egg production matters to you, ask the breeder about broodiness in that specific line instead of assuming all Olive Eggers behave the same way.
Olive Egger Appearance
There is no correct Olive Egger look.
Some birds have pea combs, muffs, and beards from Ameraucana-type ancestry. Others have single combs. Marans-based birds may inherit feathered shanks. Legbar-based birds may be lighter, more upright, or even show crests. Plumage can be black, blue, brown, gray, red, barred, patterned, or mixed.
Skin and leg color also depend on the cross. Yellow, slate, dark, pale, and mixed leg colors can all appear.
This variation is not a fault. It is normal for a non-standardized colored-egg hybrid.
Olive Egger Size and Weight
Most Olive Eggers sold for backyard flocks are medium-sized, but fixed breed weights are misleading.
One current commercial strain lists hens around 5.5 pounds and roosters around 6.5 pounds. A heavier Marans-based cross may grow larger, while a lighter Legbar-based cross may be smaller and more athletic.
That same variability is why I would not automatically call Olive Eggers dual-purpose chickens. Most are bred primarily for colored eggs, not efficient meat production.
Temperament: It Depends on the Parents
This is one of the most overgeneralized parts of Olive Egger descriptions.
There is no reliable reason to say every Olive Egger is calm, quiet, cuddly, good with children, or less aggressive than other chickens.
A bird from active Cream Legbar and Welsummer lines may be quick and independent. Another from calmer Ameraucana and Marans stock may be much easier to handle. Early socialization matters too.
The same applies to roosters. Judge the individual bird and the breeder’s line instead of assuming the Olive Egger label predicts rooster behavior.
Cold and Heat Tolerance
Olive Eggers are not automatically cold-hardy or heat-hardy simply because they are hybrids.
A pea-combed, well-feathered bird may handle cold better than a large single-combed cross. A lighter bird from Mediterranean-type ancestry may cope with heat better than a heavier, heavily feathered bird.
Use the actual bird in front of you. In winter, keep housing dry and well ventilated and watch exposed comb tissue for frostbite. In summer, provide shade, moving air, and unlimited cool water.
Housing and Space
For an average medium-sized Olive Egger, about 4 square feet of indoor coop space per bird and 8 to 10 square feet or more of run space is a reasonable starting point.
Active lines benefit from more room. If your birds inherited strong flying ability, use taller fencing or a covered run rather than assuming a low fence will hold them.
Use predator-resistant hardware cloth on vulnerable openings and lock the flock into a secure coop at night. Chicken wire is useful for containing birds, but it is not reliable protection against many predators.
Feeding Olive Eggers
Olive Eggers do not need special feed because of their egg color.
Feed chicks a complete chick starter, growing birds a suitable grower ration, and laying hens a balanced layer feed once they reach laying age. If you use an all-flock ration, offer oyster shell separately for laying hens.
Provide insoluble grit when birds eat foods other than complete feed and do not have natural access to suitable small stones. Keep treats limited so they do not dilute the nutrition in the main ration.
A dark olive shell does not require a special pigment supplement. The basic shell color comes from genetics.
Olive Egger Chicks
Olive Egger chicks can hatch in many colors because there is no standardized breeding formula.
Some are dark, some are chipmunk-striped, and others may be blue, gray, brown, red, or mixed depending on the parents. Do not use chick down color as proof of what egg shade a pullet will eventually lay.
Brooder care is the same as for other chicks: a safe heat source, dry bedding, clean water, complete starter feed, enough space, and gradual reduction of supplemental heat as they feather out.
Health and Parasite Care
Olive Eggers do not have one unique set of health problems because they do not share one standardized genetic background.
Watch for the same issues you would in any backyard flock: mites, lice, intestinal parasites, respiratory signs, bumblefoot, reproductive problems, heat stress, and injuries.
I do not recommend automatically deworming every flock on a fixed schedule without a reason. Monitor droppings, body condition, production, and clinical signs, and use fecal testing or veterinary guidance when available. Treat parasites when they are identified or strongly suspected with an appropriate product and dose.
Dust bathing is normal grooming behavior, but a dust bath by itself does not guarantee that mites or lice will never become a problem. Check birds regularly, especially around the vent and under the wings.
Are Olive Eggers Good for Beginners?
They can be, especially if you buy from a breeder who can explain the parent lines and expected adult behavior.
The biggest mistake is buying an Olive Egger based only on egg color and assuming you already know the temperament, size, broodiness, and climate tolerance.
If you want an easy first flock, ask practical questions before buying: What are the parents? How large do adults get? Are the hens broody? Are the birds flighty? What egg colors do the mothers lay? How does the line handle your climate?
Frequently Asked Questions
Are Olive Eggers a real chicken breed?
No. Olive Eggers are hybrids or colored-egg breeding projects rather than an APA-recognized standardized breed. Their appearance, size, temperament, broodiness, and egg shade depend on the parent lines and generation.
Why do Olive Eggers lay green or olive eggs?
Olive eggs result from combining a genetically blue shell with brown pigment, mainly protoporphyrin IX, deposited over the shell. More brown pigment generally creates a darker olive or khaki appearance.
How many eggs do Olive Eggers lay?
Many backyard Olive Eggers lay roughly 150–200 eggs per year, but there is no universal standard. Selected commercial or breeder lines may fall above or below that range depending on parentage and management.
Will every F2 Olive Egger lay olive eggs?
No. F2 and later-generation Olive Eggers can show wider genetic segregation, so hens may lay olive, green, blue-green, blue, brown, or other related shades depending on the breeding program.
Do Olive Egger eggs get lighter over time?
They can. The basic shell-color type usually remains the same, but brown pigment intensity may fade during a long laying cycle or as a hen ages, making olive eggs look lighter.
Are Olive Eggers friendly?
Some are very friendly, while others are active or reserved. Temperament is not fixed because Olive Eggers come from different parent breeds and lines. Early handling and the temperament of the parents both matter.
Are Olive Eggers broody?
Broodiness varies by parentage. Some lines rarely sit, while others may become broody. Ask the breeder about the specific line if broodiness or uninterrupted egg production matters to you.
Final Thoughts
Olive Eggers are fun because they are not uniform.
If your priority is a colorful egg basket, they are one of the most interesting choices you can make. Just remember that the Olive Egger name tells you less about the bird than the breeder’s actual parent lines do.
For the most predictable results, buy from someone who records parentage and egg color, and ask whether the chicks are F1, F2, or a backcross. That one question can tell you far more than a generic label on a hatchery page.
Sources
- Research: SLCO1B3 and blue eggshell genetics
- Research: pigments in white, brown, blue, green, and olive eggshells
- Research: blue-green eggshell pigmentation and SLCO1B3
- Cackle Hatchery: Olive Egger strain information
- Cackle Hatchery: F2 Olive Egger generation and egg-color variation
