When do bluebirds leave Delaware?

The Eastern Bluebird does not leave Delaware: it is reported all year, from 11% of checklists in the second week of January to 23% in late October.

When is the best time to see bluebirds in Delaware?

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

Eastern Bluebird · Sialia sialis

When Do Bluebirds Arrive in Delaware?

Photo: Dan Vickers, CC BY 4.0 via iNaturalist

The Eastern Bluebird is in Delaware all year. It turns up on about 23% of checklists at its peak (late October) and on 11% in its quietest week (the second week of January). They are the only regular bluebirds in Delaware.

When to look

PresentAll year

Peak weekOct 22-31late October

Quietest weekJan 8-14the second week of January

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

Jancommon
Febcommon
Marpeak season
Aprpeak season
Maypeak season
Juncommon
Julcommon
Augcommon
Seppeak season
Octpeak season
Novpeak season
Deccommon

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

Bluebirds in Delaware, 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 Delaware 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 Delaware

Best counties for Eastern Bluebird

Share of checklists at the peak

New Castle CountyBest early November · 1222 checklists that week, 72,140 in all33%
Sussex CountyBest early April · 1711 checklists that week, 91,027 in all21%
Kent CountyBest early April · 621 checklists that week, 36,693 in all13%

Common questions

When do bluebirds arrive in Delaware?: The Eastern Bluebird is in Delaware all year. It turns up on about 23% of checklists at its peak (late October) and on 11% in its quietest week (the second week of January). They are the only regular bluebirds in Delaware.
When do bluebirds leave Delaware?: The Eastern Bluebird does not leave Delaware: it is reported all year, from 11% of checklists in the second week of January to 23% in late October.
When is the best time to see bluebirds in Delaware?: The Eastern Bluebird is reported most often in late October, on about 23% of Delaware checklists.