When do bluebirds leave Pennsylvania?

The Eastern Bluebird does not leave Pennsylvania: it is reported all year, from 14% of checklists in late August to 23% in late October.

When is the best time to see bluebirds in Pennsylvania?

The Eastern Bluebird is reported most often in late October, on about 23% of Pennsylvania checklists.

Eastern Bluebird · Sialia sialis

When Do Bluebirds Arrive in Pennsylvania?

Photo: Dan Vickers, CC BY 4.0 via iNaturalist

The Eastern Bluebird is in Pennsylvania all year. It turns up on about 23% of checklists at its peak (late October) and on 14% in its quietest week (late August). They are the only regular bluebirds in Pennsylvania.

When to look

PresentAll year

Peak weekOct 22-31late October

Quietest weekAug 22-31late August

Best: late October. Here all year. Peak: on about 23% of Pennsylvania checklists.

Jancommon
Febpeak season
Marpeak season
Aprpeak season
Maypeak season
Junpeak season
Julpeak season
Augcommon
Seppeak season
Octpeak season
Novpeak season
Decpeak season

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

Bluebirds in Pennsylvania, species by species

Species	First arrivals	Common by	Peak	Most gone by	Peak %
Eastern Bluebird	all year	–	Oct 22-31	–	23%

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 Pennsylvania 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 Pennsylvania

Best counties for Eastern Bluebird

Share of checklists at the peak

Juniata CountyBest mid June · 141 checklists that week, 9,807 in all58%
Chester CountyBest late March · 4084 checklists that week, 144,121 in all47%
Perry CountyBest the second week of April · 260 checklists that week, 10,281 in all45%
Fulton CountyBest late February · 163 checklists that week, 7,004 in all42%
Cumberland CountyBest the second week of March · 970 checklists that week, 50,879 in all40%
Greene CountyBest the second week of July · 50 checklists that week, 2,997 in all39%

Common questions

When do bluebirds arrive in Pennsylvania?: The Eastern Bluebird is in Pennsylvania all year. It turns up on about 23% of checklists at its peak (late October) and on 14% in its quietest week (late August). They are the only regular bluebirds in Pennsylvania.
When do bluebirds leave Pennsylvania?: The Eastern Bluebird does not leave Pennsylvania: it is reported all year, from 14% of checklists in late August to 23% in late October.
When is the best time to see bluebirds in Pennsylvania?: The Eastern Bluebird is reported most often in late October, on about 23% of Pennsylvania checklists.