When do bluebirds leave New Jersey?

The Eastern Bluebird does not leave New Jersey: it is reported all year, from 7.1% of checklists in the second week of September to 17% in the second week of November.

When is the best time to see bluebirds in New Jersey?

The Eastern Bluebird is reported most often in the second week of November, on about 17% of New Jersey checklists.

Eastern Bluebird · Sialia sialis

When Do Bluebirds Arrive in New Jersey?

Photo: Dan Vickers, CC BY 4.0 via iNaturalist

The Eastern Bluebird is in New Jersey all year. It turns up on about 17% of checklists at its peak (the second week of November) and on 7.1% in its quietest week (the second week of September). They are the only regular bluebirds in New Jersey.

When to look

PresentAll year

Peak weekNov 8-14the second week of November

Quietest weekSep 8-14the second week of September

Best: the second week of November. Here all year. Peak: on about 17% of New Jersey checklists.

Jancommon
Febcommon
Marpeak season
Aprpeak season
Maycommon
Junpeak season
Julcommon
Augcommon
Sepcommon
Octpeak season
Novpeak season
Deccommon

Darker months: more checklists report it. Outlined: peak month.

Bluebirds in New Jersey, species by species

Species	First arrivals	Common by	Peak	Most gone by	Peak %
Eastern Bluebird	all year	–	Nov 8-14	–	17%

Eastern Bluebird

Share of complete checklists reporting each species, by week (4 per month). Gaps: fewer than 10 checklists that week.

Frequency is the share of complete checklists in New Jersey that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.

Where in New Jersey

Best counties for Eastern Bluebird

Share of checklists at the peak

Hunterdon CountyBest early November · 1055 checklists that week, 57,610 in all42%
Warren CountyBest late October · 461 checklists that week, 20,077 in all36%
Somerset CountyBest mid April · 1634 checklists that week, 58,057 in all33%
Mercer CountyBest late June · 1006 checklists that week, 56,614 in all28%
Sussex CountyBest late October · 620 checklists that week, 30,305 in all26%
Morris CountyBest mid April · 1769 checklists that week, 59,212 in all26%

Common questions

When do bluebirds arrive in New Jersey?: The Eastern Bluebird is in New Jersey all year. It turns up on about 17% of checklists at its peak (the second week of November) and on 7.1% in its quietest week (the second week of September). They are the only regular bluebirds in New Jersey.
When do bluebirds leave New Jersey?: The Eastern Bluebird does not leave New Jersey: it is reported all year, from 7.1% of checklists in the second week of September to 17% in the second week of November.
When is the best time to see bluebirds in New Jersey?: The Eastern Bluebird is reported most often in the second week of November, on about 17% of New Jersey checklists.