The Brahma and Jersey Giant chicken breeds are known for laying the largest eggs, often exceeding 2.5 ounces each.
If you’re looking for chickens that produce jumbo-sized eggs, certain breeds stand out from the flock. From heritage breeds to hybrid layers, discover which chickens consistently lay the biggest eggs and how to maximize egg size in your backyard coop.
Chicken Breeds That Lay Jumbo Eggs
1. Jersey Giants
True to their name, Jersey Giants are one of the largest chicken breeds and produce equally impressive eggs. These gentle giants typically lay large to extra-large brown eggs weighing 2.5-2.8 ounces each. While they don’t lay as frequently as some production breeds, their egg size makes them favorites among backyard chicken keepers.
2. Black Copper Marans
Black Copper Marans are prized for their dark chocolate-colored eggs that often reach jumbo size. Many owners report eggs so large they won’t fit in standard egg cartons. As one owner noted: “I’ve had quite a few that would not fit in a Large egg carton. The lids won’t close and the egg barely fits in the cup!”
3. Minorcas
Minorcas, particularly the Black Minorca variety, are exceptional white egg layers that produce “eggs as big as your fist” according to experienced breeders. They consistently lay extra-large to jumbo eggs, making them one of the top choices for egg size.
4. ISA Browns and Red Sex Links
These hybrid layers are egg-producing powerhouses. Despite their medium size, they lay remarkably large eggs daily. Owners report needing special jumbo cartons as standard extra-large cartons often can’t contain their eggs.
Other Notable Large-Egg Layers
| Breed | Egg Color | Average Egg Size |
|---|---|---|
| Rhode Island Red | Brown | Large to Extra-Large |
| White Leghorn | White | Large to Extra-Large |
| Buff Orpington | Brown | Large |
| Delaware | Brown | Large |
| Barred Rock | Brown | Large |
Factors Affecting Egg Size
Age of the Hen
Young hens typically start by laying smaller eggs, with size increasing as they mature. Most chickens reach peak egg size at about 1-2 years old. As noted by poultry experts, “Jumbo eggs generally come from hens that are 2+ years old.”
Genetics and Breed
Some breeds are genetically predisposed to lay larger eggs. While nutrition and environment play roles, genetics determine the potential egg size. This is why breeds like Jersey Giants consistently produce larger eggs than bantams.
Nutrition
A balanced diet rich in protein (16-18%) and calcium is essential for large egg production. Consider supplementing with oyster shell for stronger, larger eggs. Learn more about when to feed chickens grit for optimal digestion and nutrient absorption.
Environment and Stress
Chickens under stress often produce smaller eggs. Ensure your flock has adequate space (minimum 4 sq ft per bird in the coop), clean water, and protection from predators. For more on creating ideal conditions, see our guide on how big a coop for 10 chickens should be.
Egg Size Classifications
Egg sizes are determined by weight per dozen according to USDA standards:
- Peewee: 15 oz/dozen
- Small: 18 oz/dozen
- Medium: 21 oz/dozen
- Large: 24 oz/dozen
- Extra Large: 27 oz/dozen
- Jumbo: 30 oz/dozen
Health Considerations for Large Egg Layers
Chickens that lay large eggs are more prone to reproductive issues like egg binding and vent prolapse. Breeds like ISA Browns that lay large eggs frequently may have shorter lifespans (4-5 years) compared to heritage breeds. Monitor your hens closely and provide calcium supplements to support their reproductive health.
For more information on chicken health, check out Backyard Chickens, a comprehensive resource for poultry keepers. Additionally, Cackle Hatchery offers valuable breed-specific information for those looking to expand their flock.