Blue Jay eggs
Bluish or light brown, spotted with brown and gray, about 0.98–1.22 inches long — about 1.2 times the width of a US quarter. A Blue Jay lays 2–7 eggs, and they hatch after 16–18 days.
- Color
- Bluish or light brown, spotted with brown and gray
- Length
- 0.98–1.22 in (25–31 mm)
- Width
- 0.75–0.87 in (19–22 mm)
- Eggs per clutch
- 2–7 eggs
- Incubation
- 16–18 days
- Broods per year
- 1 per season (occasionally 2)
- Nest
- Open cup of twigs in tree crotches, usually 10–25 ft up
How to recognise a Blue Jay egg
- Color: bluish or light brown, spotted with brown and gray. Markings vary between females and are often heaviest around the wide end; the same female tends to lay a similar pattern every time.
- Size: 25–31 mm long by 19–22 mm wide. For scale, a US quarter is 24.3 mm across, so this egg is about 1.2 times the width of a US quarter.
- Where you find it: open cup of twigs in tree crotches, usually 10–25 ft up. Blue jays do not normally use nest boxes.
- Clutch: 2–7 eggs. A nest with far more eggs than this may hold eggs from two females, or a cowbird egg laid by a brood parasite.
Eggs that look similar
These species lay eggs in the same color group, sorted by how close they are in length. Size and nest site usually settle it.
| Species | Egg | Length |
|---|---|---|
| Blue Jay | bluish or light brown, spotted with brown and gray | 25–31 mm |
| Brown Thrasher | pale blue or greenish, finely speckled with reddish brown | 25–29 mm |
| Northern Mockingbird | light blue or greenish, spotted with red and brown | 22–27 mm |
| Northern Cardinal | grayish, buffy or greenish white, speckled with pale gray and brown | 22–26 mm |
| Baltimore Oriole | pale grayish or bluish white, with brown and black streaks and blotches | 22–25 mm |
When blue jays lay eggs, state by state
Laying starts earliest in Alabama (Mar) and latest in Maine (May). Months are estimates from regional breeding data shifted for latitude.
| State / province | Nesting season |
|---|---|
| Alabama | Mar–Jul |
| Arkansas | Apr–Jul |
| Florida | Mar–Jul |
| Georgia | Mar–Jul |
| Illinois | Apr–Jul |
| Indiana | Apr–Jul |
| Iowa | Apr–Jul |
| Kansas | Apr–Jul |
| Kentucky | Apr–Jul |
| Louisiana | Mar–Jul |
| Maine | May–Jul |
| Michigan | Apr–Jul |
| Minnesota | May–Jul |
| Mississippi | Mar–Jul |
| Missouri | Apr–Jul |
| Nebraska | Apr–Jul |
| New York | Apr–Jul |
| North Carolina | Apr–Jul |
| Nova Scotia | May–Jul |
| Ohio | Apr–Jul |
| Oklahoma | Apr–Jul |
| Ontario | May–Jul |
| Pennsylvania | Apr–Jul |
| Quebec | May–Jul |
| South Carolina | Mar–Jul |
| Tennessee | Apr–Jul |
| Texas | Mar–Jul |
| Vermont | May–Jul |
| Virginia | Apr–Jul |
| Wisconsin | May–Jul |
| Wyoming | May–Jul |
From egg to fledgling
Eggs hatch after 16–18 days and the young leave 17–21 days later. See the full baby Blue Jay guide for nestling stages and what to do if you find one on the ground.
Found eggs in your yard?
- Leave them. Parents often step away for long stretches, especially before the full clutch is laid, because most songbirds do not start incubating until the last or second-to-last egg.
- A single egg on the ground is usually lost for good. Eggs cannot be hatched at home, and possession of native bird eggs is illegal without a permit.
- If a nest is somewhere inconvenient, wait it out. Most small songbirds are done in three to five weeks.
- Watch from a distance and keep pets indoors. Repeated visits can lead predators to the nest.
Questions
Frequently asked
What color are Blue Jay eggs?
Bluish or light brown, spotted with brown and gray.
How big is a Blue Jay egg?
About 0.98–1.22 in long and 0.75–0.87 in wide (25–31 × 19–22 mm) — about 1.2 times the width of a US quarter.
How many eggs does a Blue Jay lay?
2–7 eggs per clutch, usually one egg a day, with 1 per season (occasionally 2).
How long until Blue Jay eggs hatch?
Incubation takes 16–18 days. The young then stay in the nest 17–21 days — about 33–39 days from incubation to leaving.
Can I move or touch a Blue Jay nest with eggs?
No. Native birds, their nests and eggs are protected under the Migratory Bird Treaty Act. Wait until the young have left before removing an old nest.
Sources
- Cornell Lab of Ornithology — All About Birds: Blue Jay life history
- U.S. Fish & Wildlife Service — Migratory Bird Treaty Act
Timing reflects typical patterns for the region as a whole; local dates vary with elevation and year. Check the linked eBird bar charts for your county.