How do you breed an olive egger?

Cross a **true blue-egg parent** (Ameraucana, Araucana, or Cream Legbar) with a **dark-brown-egg parent** (Marans, Welsummer, or Penedesenca). The blue base plus a brown coating on top reads as olive, and essentially **100% of the F1 daughters lay olive** — usually a light-to-sage shade.

How do you get a darker olive egg?

Stack more brown coating on the blue base. F1 olive is light because the hen only inherited brown-tint genes from one parent; **back-cross F1 hens to a very dark Marans rooster** to add a second dose of brown-coating genes. Always select from your darkest-laying birds — the darker the brown side, the darker the olive.

What's the difference between F1 and F2 olive eggers?

**F1** is the first cross (blue parent × dark-brown parent); every F1 daughter lays olive, but it's usually light because she carries only one dose of brown coating. **F2** — practically, an F1 hen back-crossed to a dark-brown parent — stacks more brown genes and lays a darker, sometimes speckled olive. F2 from two olive eggers, by contrast, scatters across colors and is not the way to darken.

Can you breed two olive eggers together to get olive eggs?

Not reliably. The olive egger is a cross, not a stabilized breed, so olive × olive splits the offspring across blue (~25%), green/olive (~50%), and brown (~25%) layers. To get dependable olive layers, cross a blue parent with a dark-brown parent, then back-cross to the dark-brown side.

Which breeds make the best olive eggers?

Pair a true blue layer — **Ameraucana, Araucana, or Cream Legbar** — with the darkest dark-brown layer you can get, usually a **Black Copper Marans**, **Welsummer**, or **Penedesenca**. The bluer the blue side and the darker the brown side, the richer the olive.

Do all olive egger chicks grow up to lay olive eggs?

Only the hens lay, and for a proper F1 cross essentially all daughters lay some shade of green or olive. Shade varies from sister to sister and a hen lays her darkest eggs early in a cycle, lightening as she lays on. Cockerels don't lay but still pass their egg-color genes to the next generation.

How to Breed Olive Eggers (F1, F2 & Back-Crossing)

Verified September 2026

The short version

To make an olive egger, cross a blue-egg parent (Ameraucana, Araucana, or Cream Legbar) with a dark-brown-egg parent (Marans, Welsummer, or Penedesenca). Blue is laid *through* the shell; brown is a coating painted *over* it — blue under brown reads as olive. Every F1 daughter inherits one blue-egg gene plus one dose of brown coating, so ~100% of F1 hens lay olive, usually a light-to-sage shade. To get deeper F2 olive, breed an F1 hen back to a dark-brown parent (a very dark Marans rooster) to stack more brown-coating genes. Don't breed two olive eggers together — the offspring scatter across blue, green, olive, and brown.

The genetics: a blue base under a brown coating

Olive is not a pigment a hen makes — it's an optical mix of two separate egg-color traits stacked on one shell. The blue comes from the dominant blue-egg (oocyan) gene, which deposits blue-green biliverdin through the full thickness of the shell, so a blue egg is blue inside and out. The brown comes from protoporphyrin, a pigment laid down as a surface coating in the last hours before laying, sitting on top of whatever the base shell color is.

Put a brown coating over a blue base and your eye blends the two into green — light green over a pale-blue base, deep mossy olive over a heavy brown coating. That is the entire recipe: a true blue layer for the base, and the darkest brown layer you can find for the coating. Because the two traits are inherited separately, you can dial the shade up over generations by concentrating the brown-coating genes while keeping the blue base.

Choosing your parents (blue side × dark-brown side)

For the blue side, use a bird that lays a genuine blue egg through the shell — an Ameraucana, Araucana, or Cream Legbar. Avoid an Easter Egger here: it may already carry a brown coating and lay green, which muddies your math about what each parent contributes. A pure blue base is what makes the cross predictable.

For the dark-brown side, pick the darkest-laying breed you can get — a Black Copper Marans, Welsummer, or Penedesenca. The darker the brown parent's egg, the darker the olive in the offspring, so this is the parent to select hardest on. Marans breeders grade eggs on a 1–9 shade card and breed from hens laying a 4 or darker; start from that kind of stock.

Either parent can be the rooster — a Marans roo over blue hens, or a blue roo over Marans hens, both work, because the blue-egg gene and the brown-coating genes pass down regardless of which side carries them.

What the F1 cross gives you

The F1 (first cross) is where olive layers are guaranteed. Every F1 daughter inherits one copy of the dominant blue-egg gene from the blue parent plus one dose of brown-coating genes from the dark-brown parent, so essentially 100% of F1 hens lay some shade of green or olive. That reliability is the reason most people never go past F1 for a working egg basket.

The catch is depth: F1 olive is usually light — a sage or light olive — because each F1 hen only pulled brown-tint genes from *one* parent, so she carries a single dose of the coating. If a light, pretty green is all you want, F1 is done. If you want a rich, dark olive, F1 is your starting point, not your destination.

F2 & back-crossing for a darker olive

To deepen the color you concentrate more brown-coating genes on top of the blue base. The reliable route is a back-cross: mate your F1 hens back to a very dark Marans rooster. Those offspring stack a second dose of brown-coating genes over the blue base and lay noticeably darker, sometimes speckled olive — this is the practical 'F2' most breeders mean when they talk about deeper olive.

A true F1 × F1 mating (two olive eggers) is a different thing and is *not* the way to darken color: it scatters offspring across blue (~25%), green/olive (~50%), and brown (~25%) layers, because the blue and brown genes reshuffle independently. Directed back-crossing to the dark-brown side, generation after generation, selecting from your darkest layers each time, is what walks the whole line toward deep, mossy olive.

Common mistakes to avoid

Don't breed two olive eggers together expecting olive chicks — the olive egger is a cross, not a stabilized breed, so olive × olive splits into blue, green, olive, and brown layers. If you want olive daughters, go back to a blue parent × dark-brown parent or back-cross to the dark-brown side.

Don't use a green-laying Easter Egger as your 'blue' parent — if that bird already carries a brown coating you no longer know what the blue side is contributing, and the cross becomes a guess. Verify the blue parent lays a true blue egg.

Don't expect uniformity or judge color too early. F1 sisters vary, and a pullet lays her darkest eggs at the start of a cycle, fading as she lays on and resetting after a molt — judge a bird's color potential by her first eggs after point-of-lay, not by mid-season eggs.

Frequently asked questions

How do you breed an olive egger?: Cross a true blue-egg parent (Ameraucana, Araucana, or Cream Legbar) with a dark-brown-egg parent (Marans, Welsummer, or Penedesenca). The blue base plus a brown coating on top reads as olive, and essentially 100% of the F1 daughters lay olive — usually a light-to-sage shade.
How do you get a darker olive egg?: Stack more brown coating on the blue base. F1 olive is light because the hen only inherited brown-tint genes from one parent; back-cross F1 hens to a very dark Marans rooster to add a second dose of brown-coating genes. Always select from your darkest-laying birds — the darker the brown side, the darker the olive.
What's the difference between F1 and F2 olive eggers?: F1 is the first cross (blue parent × dark-brown parent); every F1 daughter lays olive, but it's usually light because she carries only one dose of brown coating. F2 — practically, an F1 hen back-crossed to a dark-brown parent — stacks more brown genes and lays a darker, sometimes speckled olive. F2 from two olive eggers, by contrast, scatters across colors and is not the way to darken.
Can you breed two olive eggers together to get olive eggs?: Not reliably. The olive egger is a cross, not a stabilized breed, so olive × olive splits the offspring across blue (~25%), green/olive (~50%), and brown (~25%) layers. To get dependable olive layers, cross a blue parent with a dark-brown parent, then back-cross to the dark-brown side.
Which breeds make the best olive eggers?: Pair a true blue layer — Ameraucana, Araucana, or Cream Legbar — with the darkest dark-brown layer you can get, usually a Black Copper Marans, Welsummer, or Penedesenca. The bluer the blue side and the darker the brown side, the richer the olive.
Do all olive egger chicks grow up to lay olive eggs?: Only the hens lay, and for a proper F1 cross essentially all daughters lay some shade of green or olive. Shade varies from sister to sister and a hen lays her darkest eggs early in a cycle, lightening as she lays on. Cockerels don't lay but still pass their egg-color genes to the next generation.

Sources

How to Breed Olive Eggers (F1, F2, and back-crossing for color) — Silver Homestead (Reference)
How to Breed Olive Egger Chickens: 6 Questions Answered — Cackle Hatchery (Hatchery)
Marans + Ameraucana = Olive Egger (parent-breed cross overview) — Fresh Eggs Daily (Lisa Steele) (Reference)